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Talk:Hull (watercraft) - Wikipedia
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class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Depth</span> </div> </a> <span class="ext-discussiontools-init-sidebar-meta">5 comments</span> <ul id="toc-Depth-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Air_cavity_hulls" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Air_cavity_hulls"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>Air cavity hulls</span> </div> </a> <span class="ext-discussiontools-init-sidebar-meta">1 comment</span> <ul id="toc-Air_cavity_hulls-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Moulded_breadth" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Moulded_breadth"> <div class="vector-toc-text"> <span class="vector-toc-numb">11</span> <span>Moulded breadth</span> </div> </a> <span class="ext-discussiontools-init-sidebar-meta">1 comment</span> <ul id="toc-Moulded_breadth-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Efficiency_of_planing_hulls" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Efficiency_of_planing_hulls"> <div class="vector-toc-text"> <span class="vector-toc-numb">12</span> <span>Efficiency of planing hulls</span> </div> </a> <span class="ext-discussiontools-init-sidebar-meta">2 comments</span> <ul id="toc-Efficiency_of_planing_hulls-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Stepped_Hull" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Stepped_Hull"> <div class="vector-toc-text"> <span class="vector-toc-numb">13</span> <span>Stepped Hull</span> </div> </a> <span class="ext-discussiontools-init-sidebar-meta">2 comments</span> <ul id="toc-Stepped_Hull-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-History_section_underdeveloped" 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class="vector-toc-link" href="#Which_"Centaur"_is_being_referenced?"> <div class="vector-toc-text"> <span class="vector-toc-numb">16</span> <span>Which "Centaur" is being referenced?</span> </div> </a> <span class="ext-discussiontools-init-sidebar-meta">1 comment</span> <ul id="toc-Which_"Centaur"_is_being_referenced?-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" 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innercollapse wpb wpb-table"><tbody><tr class="wpb-header"><td class="wpb-header-icon"><span typeof="mw:File"><a href="/wiki/File:Rowing_pictogram.svg" class="mw-file-description"><img alt="WikiProject icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/57/Rowing_pictogram.svg/25px-Rowing_pictogram.svg.png" decoding="async" width="25" height="25" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/57/Rowing_pictogram.svg/38px-Rowing_pictogram.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/57/Rowing_pictogram.svg/50px-Rowing_pictogram.svg.png 2x" data-file-width="300" data-file-height="300"/></a></span></td><td class="wpb-header-combined"><a href="/wiki/Wikipedia:WikiProject_Rowing" title="Wikipedia:WikiProject Rowing">Rowing</a> </td></tr><tr><td class="mbox-text wpb-main" colspan="2"><table><tbody><tr><td class="mbox-image wpb-image"><span typeof="mw:File"><a href="/wiki/File:Rowing_pictogram.svg" class="mw-file-description"><img alt="WikiProject icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/57/Rowing_pictogram.svg/80px-Rowing_pictogram.svg.png" decoding="async" width="80" height="80" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/57/Rowing_pictogram.svg/120px-Rowing_pictogram.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/57/Rowing_pictogram.svg/160px-Rowing_pictogram.svg.png 2x" data-file-width="300" data-file-height="300"/></a></span></td><td class="mbox-text">This article is within the scope of <b><a href="/wiki/Wikipedia:WikiProject_Rowing" title="Wikipedia:WikiProject Rowing">WikiProject Rowing</a></b>, a collaborative effort to improve the coverage of <a href="/wiki/Rowing_(sport)" title="Rowing (sport)">rowing</a> on Wikipedia. If you would like to participate, please visit the project page, where you can join <a href="/wiki/Wikipedia_talk:WikiProject_Rowing" title="Wikipedia talk:WikiProject Rowing">the discussion</a> and see a list of open tasks.<span class="metadata wpb-metadata"><span class="wpb-project">Rowing</span><span class="wpb-project_link">Wikipedia:WikiProject Rowing</span><span class="wpb-banner_name">Template:WikiProject Rowing</span><span class="wpb-assessment_cat">rowing articles</span></span></td><td class="mbox-empty-cell"></td></tr><tr><td colspan="3" style="padding:0"><table class="mw-collapsible mw-collapsed" style="background:transparent;width:100%"><tbody><tr><th style="text-align:left;padding:0.2em 2px 0.2em 0">To-do list:</th></tr><tr><td style="text-align:left;padding:5px;background-color:white;border:1px solid #c0c090;margin-top:5px"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child::after,.mw-parser-output .hlist dt:last-child::after,.mw-parser-output .hlist li:last-child::after{content:none}.mw-parser-output .hlist dd dd:first-child::before,.mw-parser-output .hlist dd dt:first-child::before,.mw-parser-output .hlist dd li:first-child::before,.mw-parser-output .hlist dt dd:first-child::before,.mw-parser-output .hlist dt dt:first-child::before,.mw-parser-output .hlist dt li:first-child::before,.mw-parser-output .hlist li dd:first-child::before,.mw-parser-output .hlist li dt:first-child::before,.mw-parser-output .hlist li li:first-child::before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}</style><div class="hlist plainlinks" style="text-align:center;font-size:90%;"><ul><li><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Wikipedia%3AWikiProject_Rowing%2Fto_do&action=edit">edit</a></li><li><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Wikipedia%3AWikiProject_Rowing%2Fto_do&action=history">history</a></li><li><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Wikipedia%3AWikiProject_Rowing%2Fto_do&action=watch">watch</a></li><li><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Wikipedia%3AWikiProject_Rowing%2Fto_do&action=purge">purge</a></li></ul> </div> <figure class="mw-halign-right" typeof="mw:File"><a href="/wiki/File:Nuvola_apps_korganizer.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/en/thumb/e/e6/Nuvola_apps_korganizer.svg/50px-Nuvola_apps_korganizer.svg.png" decoding="async" width="50" height="50" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/e/e6/Nuvola_apps_korganizer.svg/75px-Nuvola_apps_korganizer.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/e/e6/Nuvola_apps_korganizer.svg/100px-Nuvola_apps_korganizer.svg.png 2x" data-file-width="128" data-file-height="128"/></a><figcaption></figcaption></figure> <ul><li><b>Featured Articles:</b></li></ul> <ol><li>Raise the <a href="/wiki/Rowing_(sport)" title="Rowing (sport)">rowing (sport)</a> article to featured status. <ol><li>Get article relisted to 'good article status'</li> <li>Put through another round of peer review, <a href="/wiki/Wikipedia:Peer_review/Rowing_(sport)" class="mw-redirect" title="Wikipedia:Peer review/Rowing (sport)">see here</a></li> <li>Nominate for featured status</li></ol></li> <li>Ditto for <a href="/wiki/Henley_Royal_Regatta" title="Henley Royal Regatta">Henley Royal Regatta</a>, <a href="/wiki/The_Boat_Race" title="The Boat Race">The Boat Race</a> , <a href="/wiki/Steve_Redgrave" title="Steve Redgrave">Steve Redgrave</a></li></ol> <ul><li><b><a href="/wiki/Wikipedia:Stubs" class="mw-redirect" title="Wikipedia:Stubs">Stubs</a>:</b> <i><a href="/wiki/Category:Rowing_stubs" title="Category:Rowing stubs">see here..</a></i></li></ul> <ol><li>Tag <b><span class="nowrap">{{</span><a href="/wiki/Template:Rowing-stub" title="Template:Rowing-stub">Rowing-stub</a><span class="nowrap">}}</span></b> onto all rowing stub articles so we can keep track of them.</li> <li>Expand stubs to at least start class.</li></ol> <ul><li><b><a href="/wiki/Wikipedia:Requested_pictures" title="Wikipedia:Requested pictures">Image requests</a>:</b> <i><a href="/wiki/Category:Wikipedia_requested_images_of_rowing" title="Category:Wikipedia requested images of rowing">see here..</a></i></li> <li><b><a href="/wiki/Wikipedia:Requested_articles" title="Wikipedia:Requested articles">Article requests</a>:</b> <i><a href="/wiki/Wikipedia:Requested_articles/Sports#Rowing" title="Wikipedia:Requested articles/Sports">see here..</a></i></li></ul> <dl><dd><ul><li>Write bios for <a href="/wiki/Category:World_Rowing_Championships_navigational_boxes" title="Category:World Rowing Championships navigational boxes">World Rowing champions</a> (see the redlinks in the templates)</li></ul></dd></dl> <ul><li><b><a href="/wiki/Wikipedia:WikiProject_Rowing/FISA_database_errors" title="Wikipedia:WikiProject Rowing/FISA database errors">Document FISA database errors</a></b></li></ul> </td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1237879475"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1256394742"><table class="tmbox tmbox-notice mw-collapsible innercollapse wpb wpb-table inactive-wikiproject"><tbody><tr class="wpb-header"><td class="wpb-header-icon"><span typeof="mw:File"><a href="/wiki/File:People_icon_dead.svg" class="mw-file-description"><img alt="WikiProject icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6b/People_icon_dead.svg/25px-People_icon_dead.svg.png" decoding="async" width="25" height="25" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6b/People_icon_dead.svg/38px-People_icon_dead.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6b/People_icon_dead.svg/50px-People_icon_dead.svg.png 2x" data-file-width="100" data-file-height="100"/></a></span></td><td class="wpb-header-combined"><a href="/wiki/Wikipedia:WikiProject_Canoeing_and_Kayaking" title="Wikipedia:WikiProject Canoeing and Kayaking">Canoeing and Kayaking</a> <span class="wpb-header-bubbles"> (<a href="/wiki/Wikipedia:INACTIVEWP" class="mw-redirect" title="Wikipedia:INACTIVEWP">inactive</a>)</span></td></tr><tr><td class="mbox-text wpb-main" colspan="2"><table><tbody><tr><td class="mbox-image wpb-image"><span typeof="mw:File"><a href="/wiki/File:People_icon_dead.svg" class="mw-file-description"><img alt="WikiProject icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6b/People_icon_dead.svg/40px-People_icon_dead.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6b/People_icon_dead.svg/60px-People_icon_dead.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6b/People_icon_dead.svg/80px-People_icon_dead.svg.png 2x" data-file-width="100" data-file-height="100"/></a></span></td><td class="mbox-text">This article is within the scope of <a href="/wiki/Wikipedia:WikiProject_Canoeing_and_Kayaking" title="Wikipedia:WikiProject Canoeing and Kayaking">WikiProject Canoeing and Kayaking</a>, a project which is currently considered to be <b><a href="/wiki/Wikipedia:INACTIVEWP" class="mw-redirect" title="Wikipedia:INACTIVEWP">inactive</a></b>.<span class="metadata wpb-metadata"><span class="wpb-project">Canoeing and Kayaking</span><span class="wpb-project_link">Wikipedia:WikiProject Canoeing and Kayaking</span><span class="wpb-banner_name">Template:WikiProject Canoeing and Kayaking</span><span class="wpb-assessment_cat">Canoeing and Kayaking articles</span></span></td><td class="mbox-empty-cell"></td></tr></tbody></table></td></tr></tbody></table> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1237879475"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1256394742"><table class="tmbox tmbox-notice mw-collapsible innercollapse wpb wpb-table"><tbody><tr class="wpb-header"><td class="wpb-header-icon"><span typeof="mw:File"><a href="/wiki/File:US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg" class="mw-file-description"><img alt="WikiProject icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg/26px-US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg" decoding="async" width="26" height="25" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg/39px-US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ac/US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg/52px-US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg 2x" data-file-width="1500" data-file-height="1444"/></a></span></td><td class="wpb-header-combined"><a href="/wiki/Wikipedia:WikiProject_Ships" title="Wikipedia:WikiProject Ships">Ships</a> <span class="wpb-header-bubbles class-c conflict">C‑class</span></td></tr><tr><td class="mbox-text wpb-main" colspan="2"><table><tbody><tr><td class="mbox-image wpb-image"><span typeof="mw:File"><a href="/wiki/File:US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg" class="mw-file-description"><img alt="WikiProject icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg/80px-US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg" decoding="async" width="80" height="77" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ac/US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg/120px-US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ac/US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg/160px-US_Navy_101021-N-7642M-317_USS_Constitution_returns_to_her_pier_after_an_underway_to_celebrate_her_213th_launching_day_anniversary.jpg 2x" data-file-width="1500" data-file-height="1444"/></a></span></td><td class="mbox-text">This article is within the scope of <b><a href="/wiki/Wikipedia:WikiProject_Ships" title="Wikipedia:WikiProject Ships">WikiProject Ships</a></b>, a project to improve all <a href="/wiki/Ship" title="Ship">Ship</a>-related articles. If you would like to help improve this and other articles, please <a href="/wiki/Wikipedia:WikiProject_Ships/Participants" title="Wikipedia:WikiProject Ships/Participants">join the project</a>, or contribute to the <a href="/wiki/Wikipedia_talk:WikiProject_Ships" title="Wikipedia talk:WikiProject Ships">project discussion</a>. All interested editors are welcome. 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Please resolve this conflict if possible.</td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table> <meta property="mw:PageProp/toc"/> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Most_central_concept?" data-mw-thread-id="h-Most_central_concept?"><span id="Most_central_concept.3F"></span><span data-mw-comment-start="" id="h-Most_central_concept?"></span>Most central concept?<span data-mw-comment-end="h-Most_central_concept?"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=1" title="Edit section: Most central concept?"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-","type":"heading","level":0,"id":"h-Most_central_concept?","replies":[]}}--></div> <p>"single most central" concept? I think that phrase needs attention, but I don't know what to change it to. --KQ </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Rafts_and_logs" data-mw-thread-id="h-Rafts_and_logs"><span data-mw-comment-start="" id="h-Rafts_and_logs"></span>Rafts and logs<span data-mw-comment-end="h-Rafts_and_logs"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=2" title="Edit section: Rafts and logs"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-","type":"heading","level":0,"id":"h-Rafts_and_logs","replies":[]}}--></div> <p>Do rafts and single logs not constitute hulls? Even if not, the distinction is artificial, and they deserve mention IMO. </p><p>Hmm, swamps, roaring streams, and even calm streams where sharp objects and ankle-twisting holes are hard to spot, are more safely crossed by walking on logs. So as long as water levels vary enough, you don't need be swept into a river and save yourself by grabbing a floating log to think of a floating log as something for a person to float on. (Perhaps floating a carcass across a water barrier on a log or raft is more innovative than personal transport by water.) <br/> --<a href="/wiki/User:Jerzy" title="User:Jerzy">Jerzy</a><a href="/wiki/User_talk:Jerzy" title="User talk:Jerzy">(t)</a> 16:29, 2005 Feb 14 (UTC) </p><p>"Hull" is related to hell and concepts of hiding, and also means the outer layer of something. "Hollow" relates to "hole". So it is probably a linguistic coincidence that hulls, as floating structures, have to be hollow (to "trap ... air" -- not a very clearly stated concept, BTW, in the case of open boats) when made of heavier-than-water materials. </p><p>As to logs and rafts, the only reason that wood and foam are significantly lighter than water is is that both of them trap air in sealed capillaries or crevices, and in bubbles. They aren't "hulls" in being necessarily shell- or cowl-shaped, but they are hollow at a micro-scale. <br/> --<a href="/wiki/User:Jerzy" title="User:Jerzy">Jerzy</a><a href="/wiki/User_talk:Jerzy" title="User talk:Jerzy">(t)</a> 16:45, 2005 Feb 14 (UTC) </p> <hr/> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-P199-2006-03-20T14:07:00.000Z","type":"heading","level":0,"id":"h-Mergefrom_Displacement_hull-2006-03-20T14:07:00.000Z","replies":["c-P199-2006-03-20T14:07:00.000Z-Mergefrom_Displacement_hull"],"text":"Mergefrom Displacement hull","linkableTitle":"Mergefrom Displacement hull"}--><h2 id="Mergefrom_Displacement_hull" data-mw-thread-id="h-Mergefrom_Displacement_hull-2006-03-20T14:07:00.000Z"><span data-mw-comment-start="" id="h-Mergefrom_Displacement_hull-2006-03-20T14:07:00.000Z"></span>Mergefrom <a href="/wiki/Displacement_hull" class="mw-redirect" title="Displacement hull">Displacement hull</a><span data-mw-comment-end="h-Mergefrom_Displacement_hull-2006-03-20T14:07:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=3" title="Edit section: Mergefrom Displacement hull"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-P199-2006-03-20T14:07:00.000Z","type":"heading","level":0,"id":"h-Mergefrom_Displacement_hull-2006-03-20T14:07:00.000Z","replies":["c-P199-2006-03-20T14:07:00.000Z-Mergefrom_Displacement_hull"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-Ewlyahoocom-2006-04-07T06:07:00.000Z-CP\\M-2006-04-07T02:05:00.000Z","timestamp":"2006-04-07T06:07:00.000Z"}__--><!--__DTCOMMENTCOUNT__3__--><!--__DTAUTHORCOUNT__3__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-P199-2006-03-20T14:07:00.000Z","type":"heading","level":0,"id":"h-Mergefrom_Displacement_hull-2006-03-20T14:07:00.000Z","replies":["c-P199-2006-03-20T14:07:00.000Z-Mergefrom_Displacement_hull"],"text":"Mergefrom Displacement hull","linkableTitle":"Mergefrom Displacement hull"}--></div></div></div> <p><span data-mw-comment-start="" id="c-P199-2006-03-20T14:07:00.000Z-Mergefrom_Displacement_hull"></span>Totally agree! <a href="/wiki/User:P199" title="User:P199">P199</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-P199-2006-03-20T14:07:00.000Z-Mergefrom_Displacement_hull" class="ext-discussiontools-init-timestamplink">14:07, 20 March 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-P199-2006-03-20T14:07:00.000Z-Mergefrom_Displacement_hull"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-03-20T14:07:00.000Z","author":"P199","type":"comment","level":1,"id":"c-P199-2006-03-20T14:07:00.000Z-Mergefrom_Displacement_hull","replies":["c-CP\\M-2006-04-07T02:05:00.000Z-P199-2006-03-20T14:07:00.000Z"]}}--></span><span data-mw-comment-end="c-P199-2006-03-20T14:07:00.000Z-Mergefrom_Displacement_hull"></span> </p> <dl><dd><span data-mw-comment-start="" id="c-CP\M-2006-04-07T02:05:00.000Z-P199-2006-03-20T14:07:00.000Z"></span>Merged. <a href="/wiki/User:CP%5CM" title="User:CP\M">CP/M</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-CP\M-2006-04-07T02:05:00.000Z-P199-2006-03-20T14:07:00.000Z" class="ext-discussiontools-init-timestamplink">02:05, 7 April 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-CP\M-2006-04-07T02:05:00.000Z-P199-2006-03-20T14:07:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-04-07T02:05:00.000Z","author":"CP\\M","type":"comment","level":2,"id":"c-CP\\M-2006-04-07T02:05:00.000Z-P199-2006-03-20T14:07:00.000Z","replies":["c-Ewlyahoocom-2006-04-07T06:07:00.000Z-CP\\M-2006-04-07T02:05:00.000Z"],"displayName":"CP\/M"}}--></span><span data-mw-comment-end="c-CP\M-2006-04-07T02:05:00.000Z-P199-2006-03-20T14:07:00.000Z"></span></dd></dl> <dl><dd><dl><dd><span data-mw-comment-start="" id="c-Ewlyahoocom-2006-04-07T06:07:00.000Z-CP\M-2006-04-07T02:05:00.000Z"></span>Thanks! <a href="/wiki/User:Ewlyahoocom" title="User:Ewlyahoocom">Ewlyahoocom</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Ewlyahoocom-2006-04-07T06:07:00.000Z-CP\M-2006-04-07T02:05:00.000Z" class="ext-discussiontools-init-timestamplink">06:07, 7 April 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Ewlyahoocom-2006-04-07T06:07:00.000Z-CP\M-2006-04-07T02:05:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-04-07T06:07:00.000Z","author":"Ewlyahoocom","type":"comment","level":3,"id":"c-Ewlyahoocom-2006-04-07T06:07:00.000Z-CP\\M-2006-04-07T02:05:00.000Z","replies":[]}}--></span><span data-mw-comment-end="c-Ewlyahoocom-2006-04-07T06:07:00.000Z-CP\M-2006-04-07T02:05:00.000Z"></span></dd></dl></dd></dl> <p><br/> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-Jmvolc-2006-05-18T00:49:00.000Z","type":"heading","level":0,"id":"h-This_Article_Attempts_Too_Much-2006-05-18T00:49:00.000Z","replies":["c-Jmvolc-2006-05-18T00:49:00.000Z-This_Article_Attempts_Too_Much","c-Ewlyahoocom-2006-05-21T23:37:00.000Z-This_Article_Attempts_Too_Much","c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much"],"text":"This Article Attempts Too Much","linkableTitle":"This Article Attempts Too Much"}--><h2 id="This_Article_Attempts_Too_Much" data-mw-thread-id="h-This_Article_Attempts_Too_Much-2006-05-18T00:49:00.000Z"><span data-mw-comment-start="" id="h-This_Article_Attempts_Too_Much-2006-05-18T00:49:00.000Z"></span>This Article Attempts Too Much<span data-mw-comment-end="h-This_Article_Attempts_Too_Much-2006-05-18T00:49:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=4" title="Edit section: This Article Attempts Too Much"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-Jmvolc-2006-05-18T00:49:00.000Z","type":"heading","level":0,"id":"h-This_Article_Attempts_Too_Much-2006-05-18T00:49:00.000Z","replies":["c-Jmvolc-2006-05-18T00:49:00.000Z-This_Article_Attempts_Too_Much","c-Ewlyahoocom-2006-05-21T23:37:00.000Z-This_Article_Attempts_Too_Much","c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much","timestamp":"2006-05-27T01:36:00.000Z"}__--><!--__DTCOMMENTCOUNT__6__--><!--__DTAUTHORCOUNT__4__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-Jmvolc-2006-05-18T00:49:00.000Z","type":"heading","level":0,"id":"h-This_Article_Attempts_Too_Much-2006-05-18T00:49:00.000Z","replies":["c-Jmvolc-2006-05-18T00:49:00.000Z-This_Article_Attempts_Too_Much","c-Ewlyahoocom-2006-05-21T23:37:00.000Z-This_Article_Attempts_Too_Much","c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much"],"text":"This Article Attempts Too Much","linkableTitle":"This Article Attempts Too Much"}--></div></div></div> <p><span data-mw-comment-start="" id="c-Jmvolc-2006-05-18T00:49:00.000Z-This_Article_Attempts_Too_Much"></span>I'm not really sure what is intended by the discussion on "the class of shapes" ... hulls come in many varieties but are grouped primarily as follows: </p> <dl><dd><ul><li>Moulded, round bilged or soft-chined</li> <li>Chined or Hard-chined</li></ul></dd></dl> <p>After this they can be categorized as: </p> <dl><dd><ul><li>Displacement</li> <li>Semi-Planing</li> <li>Planing</li></ul></dd></dl> <p>The discussion on bulbs (note that there are bow and stern bulbs)has merit and should be retained as it is a prominent feature of modern ship forms. </p><p>The section on hull metrics needs to be merged completed and clarified. So far only Block & Prismatic (Cb & Cp) are covered. </p> <dl><dd><ul><li>Block Measures (LOA, LWL, Bmax, Mmld, d or T and D)</li> <li>Form derivatives (LCB, VCB, LCF, TPI, MCT, KMt KMl)</li> <li>Coefficients (Cb, Cm or Cx & Cp)</li></ul></dd></dl> <p>The section on bouyancy should be retained (it is afterall, the main reason for the hull) The historical bits should be collected into and Origins section. </p><p>A series of images would help this article a lot. </p><p>Please advise if there is any objection to re-working this article as noted. </p><p><a href="/wiki/User:Jmvolc" title="User:Jmvolc">Jmvolc</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Jmvolc-2006-05-18T00:49:00.000Z-This_Article_Attempts_Too_Much" class="ext-discussiontools-init-timestamplink">00:49, 18 May 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Jmvolc-2006-05-18T00:49:00.000Z-This_Article_Attempts_Too_Much"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-05-18T00:49:00.000Z","author":"Jmvolc","type":"comment","level":1,"id":"c-Jmvolc-2006-05-18T00:49:00.000Z-This_Article_Attempts_Too_Much","replies":["c-CP\\M-2006-05-21T22:28:00.000Z-Jmvolc-2006-05-18T00:49:00.000Z"]}}--></span><span data-mw-comment-end="c-Jmvolc-2006-05-18T00:49:00.000Z-This_Article_Attempts_Too_Much"></span> </p> <dl><dd><span data-mw-comment-start="" id="c-CP\M-2006-05-21T22:28:00.000Z-Jmvolc-2006-05-18T00:49:00.000Z"></span>It seems just the right way for the article, so reworking would be really useful. <a href="/wiki/User:CP%5CM" title="User:CP\M">CP/M</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-CP\M-2006-05-21T22:28:00.000Z-Jmvolc-2006-05-18T00:49:00.000Z" class="ext-discussiontools-init-timestamplink">22:28, 21 May 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-CP\M-2006-05-21T22:28:00.000Z-Jmvolc-2006-05-18T00:49:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-05-21T22:28:00.000Z","author":"CP\\M","type":"comment","level":2,"id":"c-CP\\M-2006-05-21T22:28:00.000Z-Jmvolc-2006-05-18T00:49:00.000Z","replies":[],"displayName":"CP\/M"}}--></span><span data-mw-comment-end="c-CP\M-2006-05-21T22:28:00.000Z-Jmvolc-2006-05-18T00:49:00.000Z"></span></dd></dl> <p><span data-mw-comment-start="" id="c-Ewlyahoocom-2006-05-21T23:37:00.000Z-This_Article_Attempts_Too_Much"></span>Please don't forget that we have a lot of "general" readers, and that not everone who is going to be reading this article is a shipbuilder, a sailor, or even have ever been on a ship. <a href="/wiki/User:Ewlyahoocom" title="User:Ewlyahoocom">Ewlyahoocom</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Ewlyahoocom-2006-05-21T23:37:00.000Z-This_Article_Attempts_Too_Much" class="ext-discussiontools-init-timestamplink">23:37, 21 May 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Ewlyahoocom-2006-05-21T23:37:00.000Z-This_Article_Attempts_Too_Much"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-05-21T23:37:00.000Z","author":"Ewlyahoocom","type":"comment","level":1,"id":"c-Ewlyahoocom-2006-05-21T23:37:00.000Z-This_Article_Attempts_Too_Much","replies":["c-Kablammo-2006-05-24T23:56:00.000Z-Ewlyahoocom-2006-05-21T23:37:00.000Z"]}}--></span><span data-mw-comment-end="c-Ewlyahoocom-2006-05-21T23:37:00.000Z-This_Article_Attempts_Too_Much"></span> </p> <dl><dd><span data-mw-comment-start="" id="c-Kablammo-2006-05-24T23:56:00.000Z-Ewlyahoocom-2006-05-21T23:37:00.000Z"></span>The current definition of block coefficient is more confusing than the one on the previous page. Take for example: <dl><dd>" Block Coefficient (Cb) is the volume (&nabla) divided by the LWL x BWL x T."</dd></dl></dd> <dd>What does this mean? <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2006-05-24T23:56:00.000Z-Ewlyahoocom-2006-05-21T23:37:00.000Z" class="ext-discussiontools-init-timestamplink">23:56, 24 May 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2006-05-24T23:56:00.000Z-Ewlyahoocom-2006-05-21T23:37:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-05-24T23:56:00.000Z","author":"Kablammo","type":"comment","level":2,"id":"c-Kablammo-2006-05-24T23:56:00.000Z-Ewlyahoocom-2006-05-21T23:37:00.000Z","replies":["c-CP\\M-2006-05-25T00:05:00.000Z-Kablammo-2006-05-24T23:56:00.000Z"]}}--></span><span data-mw-comment-end="c-Kablammo-2006-05-24T23:56:00.000Z-Ewlyahoocom-2006-05-21T23:37:00.000Z"></span></dd></dl> <dl><dd><dl><dd><span data-mw-comment-start="" id="c-CP\M-2006-05-25T00:05:00.000Z-Kablammo-2006-05-24T23:56:00.000Z"></span>Added a simpler explanation, and restored the old section. The new part is good, but it's quite technical and requires attention to comprehend. <a href="/wiki/User:CP%5CM" title="User:CP\M">CP/M</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-CP\M-2006-05-25T00:05:00.000Z-Kablammo-2006-05-24T23:56:00.000Z" class="ext-discussiontools-init-timestamplink">00:05, 25 May 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-CP\M-2006-05-25T00:05:00.000Z-Kablammo-2006-05-24T23:56:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-05-25T00:05:00.000Z","author":"CP\\M","type":"comment","level":3,"id":"c-CP\\M-2006-05-25T00:05:00.000Z-Kablammo-2006-05-24T23:56:00.000Z","replies":[],"displayName":"CP\/M"}}--></span><span data-mw-comment-end="c-CP\M-2006-05-25T00:05:00.000Z-Kablammo-2006-05-24T23:56:00.000Z"></span></dd></dl></dd></dl> <p><span data-mw-comment-start="" id="c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much"></span>The subjects addressed in this article are by their very nature quite techincal. The information provided is techically correct but may not be descriptive enough for the "general reader". Should more text/digrams be added to improve enhance comprehension? </p><p>My apologies for the &nabla term - I read that this in the Wikipedia Tutorial that it was to display the appropriate Greek character for Volume but alas, it did not. As described, Block Coeff is the displaced volume defined by the hull divided by the ecompassing block (LWL x BWL x draft). I could provide a diagram that may help, please advise if this should be added. </p><p>I have delete a significant portion of the Features section as the descriptions were at best over-generalizations and at worst, just wrong. Hopefully I have not offended. I can provide a more detailed explanation if required. <a href="/wiki/User:Jmvolc" title="User:Jmvolc">Jmvolc</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much" class="ext-discussiontools-init-timestamplink">01:36, 27 May 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-05-27T01:36:00.000Z","author":"Jmvolc","type":"comment","level":1,"id":"c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much","replies":[]}}--></span><span data-mw-comment-end="c-Jmvolc-2006-05-27T01:36:00.000Z-This_Article_Attempts_Too_Much"></span> </p> <dl><dd>I agree, this article should be aimed primarily on technical details, but they still may be described in a simpler way along with the technical one. Coefficients can be provided with a direct description (for instance, the second external link has some). I've just added descriptions there, along with some correction, and will add now to some others, but adding some diagrams would be nice.</dd></dl> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-Kablammo-2006-06-01T01:49:00.000Z","type":"heading","level":0,"id":"h-Planing-2006-06-01T01:49:00.000Z","replies":["c-Kablammo-2006-06-01T01:49:00.000Z-Planing","c-Kablammo-2006-06-01T02:42:00.000Z-Planing","c-Kablammo-2006-06-01T14:07:00.000Z-Planing","c-Jmvolc-2006-06-05T22:26:00.000Z-Planing","c-Jmvolc-2006-06-06T01:36:00.000Z-Planing","c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing"],"text":"Planing","linkableTitle":"Planing"}--><h2 id="Planing" data-mw-thread-id="h-Planing-2006-06-01T01:49:00.000Z"><span data-mw-comment-start="" id="h-Planing-2006-06-01T01:49:00.000Z"></span>Planing<span data-mw-comment-end="h-Planing-2006-06-01T01:49:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=5" title="Edit section: Planing"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-Kablammo-2006-06-01T01:49:00.000Z","type":"heading","level":0,"id":"h-Planing-2006-06-01T01:49:00.000Z","replies":["c-Kablammo-2006-06-01T01:49:00.000Z-Planing","c-Kablammo-2006-06-01T02:42:00.000Z-Planing","c-Kablammo-2006-06-01T14:07:00.000Z-Planing","c-Jmvolc-2006-06-05T22:26:00.000Z-Planing","c-Jmvolc-2006-06-06T01:36:00.000Z-Planing","c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing","timestamp":"2011-09-05T17:01:00.000Z"}__--><!--__DTCOMMENTCOUNT__10__--><!--__DTAUTHORCOUNT__6__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-Kablammo-2006-06-01T01:49:00.000Z","type":"heading","level":0,"id":"h-Planing-2006-06-01T01:49:00.000Z","replies":["c-Kablammo-2006-06-01T01:49:00.000Z-Planing","c-Kablammo-2006-06-01T02:42:00.000Z-Planing","c-Kablammo-2006-06-01T14:07:00.000Z-Planing","c-Jmvolc-2006-06-05T22:26:00.000Z-Planing","c-Jmvolc-2006-06-06T01:36:00.000Z-Planing","c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing"],"text":"Planing","linkableTitle":"Planing"}--></div></div></div> <p><span data-mw-comment-start="" id="c-Kablammo-2006-06-01T01:49:00.000Z-Planing"></span>The page currently states that <i>planing</i> results from dynamic lift at speed, and in turn defines <i>dynamic lift</i> as "the upward force generated by the water as the hull moves through it". Is this correct? Why would the water generate any upward force beyond that necessary to float the hull? Or is planing a reaction to downward force exerted by water deflected downward by the shape of the hull? Are there any physicists out there who can clarify this? <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2006-06-01T01:49:00.000Z-Planing" class="ext-discussiontools-init-timestamplink">01:49, 1 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2006-06-01T01:49:00.000Z-Planing"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-01T01:49:00.000Z","author":"Kablammo","type":"comment","level":1,"id":"c-Kablammo-2006-06-01T01:49:00.000Z-Planing","replies":["c-Georgewilliamherbert-2006-06-01T02:08:00.000Z-Kablammo-2006-06-01T01:49:00.000Z"]}}--></span><span data-mw-comment-end="c-Kablammo-2006-06-01T01:49:00.000Z-Planing"></span> </p> <dl><dd><span data-mw-comment-start="" id="c-Georgewilliamherbert-2006-06-01T02:08:00.000Z-Kablammo-2006-06-01T01:49:00.000Z"></span>I'll see about how to explain more clearly in the article, but...</dd> <dd>There are two types of force the water can provide. Buoyancy, which is the displaced weight of water, and dynamic lift, which is similar to the lift that you get from moving an airplane wing through air. Buoyancy is always there. Dynamic lift is only there while you're moving, because you're moving. As dynamic lift increases, the boat moves up, and buoyancy decreases (more of the weight is being taken by the planing dynamic lift).</dd> <dd>Does this help? <a href="/wiki/User:Georgewilliamherbert" title="User:Georgewilliamherbert">Georgewilliamherbert</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Georgewilliamherbert-2006-06-01T02:08:00.000Z-Kablammo-2006-06-01T01:49:00.000Z" class="ext-discussiontools-init-timestamplink">02:08, 1 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Georgewilliamherbert-2006-06-01T02:08:00.000Z-Kablammo-2006-06-01T01:49:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-01T02:08:00.000Z","author":"Georgewilliamherbert","type":"comment","level":2,"id":"c-Georgewilliamherbert-2006-06-01T02:08:00.000Z-Kablammo-2006-06-01T01:49:00.000Z","replies":[]}}--></span><span data-mw-comment-end="c-Georgewilliamherbert-2006-06-01T02:08:00.000Z-Kablammo-2006-06-01T01:49:00.000Z"></span></dd></dl> <p><span data-mw-comment-start="" id="c-Kablammo-2006-06-01T02:42:00.000Z-Planing"></span>It does. What I questioned was the statement that the water <i>generates</i> an upward force. I would have thought that the water does nothing beyond float the boat. I'm also not sure about the airplane wing analogy-- I had understood that lift on a wing results from decreased pressure on the top surface of the wing. Does that apply here? <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2006-06-01T02:42:00.000Z-Planing" class="ext-discussiontools-init-timestamplink">02:42, 1 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2006-06-01T02:42:00.000Z-Planing"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-01T02:42:00.000Z","author":"Kablammo","type":"comment","level":1,"id":"c-Kablammo-2006-06-01T02:42:00.000Z-Planing","replies":["c-Fluzwup-2006-06-01T14:34:00.000Z-Kablammo-2006-06-01T02:42:00.000Z","c-CP\\M-2006-06-01T02:45:00.000Z-Kablammo-2006-06-01T02:42:00.000Z"]}}--></span><span data-mw-comment-end="c-Kablammo-2006-06-01T02:42:00.000Z-Planing"></span> </p> <dl><dd><dl><dd><span data-mw-comment-start="" id="c-Fluzwup-2006-06-01T14:34:00.000Z-Kablammo-2006-06-01T02:42:00.000Z"></span>Let me slip in a comment here--lift results not from decreased pressure, but rather from the deflection of the fluid through which the foil is passing. Any shape that deflects the fluid, including a flat plate, will generate lift; in the case of a flat plate (fluid flow direction -> \ <- angled plate) the bottom of the plate will push the fluid down, generating lift. The flow over the top of the plate will immediately stall out and swirl, slowing the fluid flow and causing drag; the low pressure on the back side will also cause the flow around the aft edge of the plate to be sucked back up, canceling out a good portion of the lift. The suction does have an impact, but it's as a mechanism for deflecting the air efficiently. The "suction causes lift" argument is hard to counter, since it is so entangled with the airflow deflection, but it's still Newton's third law that's really doing the work.</dd></dl></dd></dl> <dl><dd><dl><dd>The lift on a planing hull is a case where the action/reaction explanation of lift works, but the suction explanation does not, since there is fluid flow on only one side of the hull (we'll ignore the air, it's 1000x less dense and has very little impact). A planing hull deflects the water primarily down (again, fluid flow direction-> \ <- angled plate) and this action pushes the hull upwards. Calculate the mass of water displaced by the hull, the acceleration required to move that mass of water out of the way, and you get the amount of lift on the hull (forcer = mass * acceleration). As the hull lifts up, the amount of water displaced is reduced, until an equilibrium between lift and displacement is reached, and then you're planing. Since nearly all hulls (except a submerged submarine's) are going to push more water down than up, all hulls will generate some planing force, but wide, flat bottomed hulls will push the largest fraction of water down, and will thus generate the maximum lift for planing. <a href="/wiki/User:Fluzwup" title="User:Fluzwup">scot</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Fluzwup-2006-06-01T14:34:00.000Z-Kablammo-2006-06-01T02:42:00.000Z" class="ext-discussiontools-init-timestamplink">14:34, 1 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Fluzwup-2006-06-01T14:34:00.000Z-Kablammo-2006-06-01T02:42:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-01T14:34:00.000Z","author":"Fluzwup","type":"comment","level":3,"id":"c-Fluzwup-2006-06-01T14:34:00.000Z-Kablammo-2006-06-01T02:42:00.000Z","replies":[],"displayName":"scot"}}--></span><span data-mw-comment-end="c-Fluzwup-2006-06-01T14:34:00.000Z-Kablammo-2006-06-01T02:42:00.000Z"></span></dd></dl></dd></dl> <dl><dd><span data-mw-comment-start="" id="c-CP\M-2006-06-01T02:45:00.000Z-Kablammo-2006-06-01T02:42:00.000Z"></span>The dynamic lift works pretty much the same as with aircraft's wing. A hydrostatical or hydrodynamical force applied to surface always acts normally to it. When the ship is moving, the resistance force, oriented horizontally ( -- ), is generated . If the bottom is placed upwards at the bow (like / ), the force acts normally to it ( \ ). It may be divided into backwards and upwards components. The backwards one counters the propulsion force, and the upwards gravity force, thus lifting the ship.</dd> <dd>Comparing to the airplane wing: the pressure on top surface there is decreased; however, a ship has the same situation, with almost no upwards pressure at all, as air generates much less dynamic force than water.</dd> <dd><a href="/wiki/User:CP%5CM" title="User:CP\M">CP/M</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-CP\M-2006-06-01T02:45:00.000Z-Kablammo-2006-06-01T02:42:00.000Z" class="ext-discussiontools-init-timestamplink">02:45, 1 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-CP\M-2006-06-01T02:45:00.000Z-Kablammo-2006-06-01T02:42:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-01T02:45:00.000Z","author":"CP\\M","type":"comment","level":2,"id":"c-CP\\M-2006-06-01T02:45:00.000Z-Kablammo-2006-06-01T02:42:00.000Z","replies":[],"displayName":"CP\/M"}}--></span><span data-mw-comment-end="c-CP\M-2006-06-01T02:45:00.000Z-Kablammo-2006-06-01T02:42:00.000Z"></span></dd></dl> <p><span data-mw-comment-start="" id="c-Kablammo-2006-06-01T14:07:00.000Z-Planing"></span>So if I read this correctly, then the water does not generate a force (as stated in the main page), but is directed by the moving hull to create an upward force? Could I suggest that one of you technical folks clarify the main page here? There is more technical description of <i>planing</i>, not in the currently-linked page on <a href="/wiki/Planing" class="mw-disambig" title="Planing">planing</a>, but on the <a href="/wiki/Planing_(sailing)" class="mw-redirect" title="Planing (sailing)">Planing (sailing)</a> page. Perhaps that should be directly linked here. That would leave this article as a good general entry, with the technical explanation in the planing article. <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2006-06-01T14:07:00.000Z-Planing" class="ext-discussiontools-init-timestamplink">14:07, 1 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2006-06-01T14:07:00.000Z-Planing"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-01T14:07:00.000Z","author":"Kablammo","type":"comment","level":1,"id":"c-Kablammo-2006-06-01T14:07:00.000Z-Planing","replies":[]}}--></span><span data-mw-comment-end="c-Kablammo-2006-06-01T14:07:00.000Z-Planing"></span> </p><p><span data-mw-comment-start="" id="c-Jmvolc-2006-06-05T22:26:00.000Z-Planing"></span>You are of course correct. Static water is no more capable of "generating" a dynamic force than it is of dancing a waltz. A more accurate description would be paraphrased from SNAME's "Principles of Naval Architecture" ... </p> <pre> The Planing Hull form is configured to develop positive dynamic pressure so that its draft decreases with increasing speed. </pre> <p>I have modified the text to suit. <a href="/wiki/User:Jmvolc" title="User:Jmvolc">Jmvolc</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Jmvolc-2006-06-05T22:26:00.000Z-Planing" class="ext-discussiontools-init-timestamplink">22:26, 5 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Jmvolc-2006-06-05T22:26:00.000Z-Planing"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-05T22:26:00.000Z","author":"Jmvolc","type":"comment","level":1,"id":"c-Jmvolc-2006-06-05T22:26:00.000Z-Planing","replies":["c-Kablammo-2006-06-06T00:05:00.000Z-Jmvolc-2006-06-05T22:26:00.000Z"]}}--></span><span data-mw-comment-end="c-Jmvolc-2006-06-05T22:26:00.000Z-Planing"></span> </p> <dl><dd><span data-mw-comment-start="" id="c-Kablammo-2006-06-06T00:05:00.000Z-Jmvolc-2006-06-05T22:26:00.000Z"></span>Thank you. I in turn have deleted the definition of <i>semi-planing</i>, as it did not conform to your improved wording and seems self-explanatory anyway. <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2006-06-06T00:05:00.000Z-Jmvolc-2006-06-05T22:26:00.000Z" class="ext-discussiontools-init-timestamplink">00:05, 6 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2006-06-06T00:05:00.000Z-Jmvolc-2006-06-05T22:26:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-06T00:05:00.000Z","author":"Kablammo","type":"comment","level":2,"id":"c-Kablammo-2006-06-06T00:05:00.000Z-Jmvolc-2006-06-05T22:26:00.000Z","replies":[]}}--></span><span data-mw-comment-end="c-Kablammo-2006-06-06T00:05:00.000Z-Jmvolc-2006-06-05T22:26:00.000Z"></span></dd></dl> <p><span data-mw-comment-start="" id="c-Jmvolc-2006-06-06T01:36:00.000Z-Planing"></span>I would like to reinstate the <i>semi-planing</i> definition. It is a recognized category of hull type , I will change the definition to fall in line with the <i>planing</i> definition. <a href="/wiki/User:Jmvolc" title="User:Jmvolc">Jmvolc</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Jmvolc-2006-06-06T01:36:00.000Z-Planing" class="ext-discussiontools-init-timestamplink">01:36, 6 June 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Jmvolc-2006-06-06T01:36:00.000Z-Planing"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-06-06T01:36:00.000Z","author":"Jmvolc","type":"comment","level":1,"id":"c-Jmvolc-2006-06-06T01:36:00.000Z-Planing","replies":[]}}--></span><span data-mw-comment-end="c-Jmvolc-2006-06-06T01:36:00.000Z-Planing"></span> </p><p><br/><span data-mw-comment-start="" id="c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing"></span> I would like to propose a seperate page for planing hulls as there are so many varients of this hull, it deserves a page by itself to discuss it. For example: deep Vee planing hulls stepped planing hulls warped planing hulls prismatic planing hulls </p><p>Then there are varity of detailed features of planing hulls that warrant discussion: spray strakes chines Deadrise angle </p><p>Also it would be worthwhile mentioning some of the great pioneers in the development of planing hulls. People Like Renato Sonny Levi, Daniel Savitsky and others. I am happy to cooperate with this forum to setup such a page. --<a href="/wiki/Special:Contributions/41.133.242.224" title="Special:Contributions/41.133.242.224">41.133.242.224</a> (<a href="/w/index.php?title=User_talk:41.133.242.224&action=edit&redlink=1" class="new" title="User talk:41.133.242.224 (page does not exist)">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing" class="ext-discussiontools-init-timestamplink">17:01, 5 September 2011 (UTC)</a> Dr. Gunther Migeotte gmroaming@gmail.com<span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2011-09-05T17:01:00.000Z","author":"41.133.242.224","type":"comment","level":1,"id":"c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing","replies":[]}}--></span><span data-mw-comment-end="c-41.133.242.224-2011-09-05T17:01:00.000Z-Planing"></span> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-Jmvolc-2006-08-12T12:24:00.000Z","type":"heading","level":0,"id":"h-Wave_piercing?-2006-08-12T12:24:00.000Z","replies":["c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?"],"text":"Wave piercing?","linkableTitle":"Wave piercing?"}--><h2 id="Wave_piercing?" data-mw-thread-id="h-Wave_piercing?-2006-08-12T12:24:00.000Z"><span id="Wave_piercing.3F"></span><span data-mw-comment-start="" id="h-Wave_piercing?-2006-08-12T12:24:00.000Z"></span>Wave piercing?<span data-mw-comment-end="h-Wave_piercing?-2006-08-12T12:24:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=6" title="Edit section: Wave piercing?"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-Jmvolc-2006-08-12T12:24:00.000Z","type":"heading","level":0,"id":"h-Wave_piercing?-2006-08-12T12:24:00.000Z","replies":["c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?","timestamp":"2006-08-12T12:24:00.000Z"}__--><!--__DTCOMMENTCOUNT__1__--><!--__DTAUTHORCOUNT__1__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-Jmvolc-2006-08-12T12:24:00.000Z","type":"heading","level":0,"id":"h-Wave_piercing?-2006-08-12T12:24:00.000Z","replies":["c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?"],"text":"Wave piercing?","linkableTitle":"Wave piercing?"}--></div></div></div> <p><a href="/wiki/Wave-piercing" class="mw-redirect" title="Wave-piercing"><span data-mw-comment-start="" id="c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?"></span>Wave-piercingwould</a> seem to warrant inclusion. See <a href="/wiki/HSV-2_Swift" title="HSV-2 Swift">HSV-2 Swift</a>, <a href="/wiki/Incat" title="Incat">Incat</a> and <a href="/wiki/Earthrace" class="mw-redirect" title="Earthrace">Earthrace</a> </p> <ul><li>Wave piercing hull forms are a distinct variant of the displacement form. I feel it belongs in its own entry as people will inevitably search for that term (ie: “wave piercing�?) and that if included here would open the door for the inclusion of many other variants (catamarans, trimarans, sea sled, barge, double-ended, etc.) <a href="/wiki/User:Jmvolc" title="User:Jmvolc">Jmvolc</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?" class="ext-discussiontools-init-timestamplink">12:24, 12 August 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-08-12T12:24:00.000Z","author":"Jmvolc","type":"comment","level":1,"id":"c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?","replies":[]}}--></span><span data-mw-comment-end="c-Jmvolc-2006-08-12T12:24:00.000Z-Wave_piercing?"></span></li></ul> <p><br/> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-Ratarsed-2006-07-28T08:38:00.000Z","type":"heading","level":0,"id":"h-Merge_in_Draft_(nautical)-2006-07-28T08:38:00.000Z","replies":["c-Ratarsed-2006-07-28T08:38:00.000Z-Merge_in_Draft_(nautical)","c-CP\\M-2006-07-28T08:42:00.000Z-Merge_in_Draft_(nautical)","c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)"],"text":"Merge in Draft (nautical)","linkableTitle":"Merge in Draft (nautical)"}--><h2 id="Merge_in_Draft_(nautical)" data-mw-thread-id="h-Merge_in_Draft_(nautical)-2006-07-28T08:38:00.000Z"><span id="Merge_in_Draft_.28nautical.29"></span><span data-mw-comment-start="" id="h-Merge_in_Draft_(nautical)-2006-07-28T08:38:00.000Z"></span>Merge in <a href="/wiki/Draft_(nautical)" class="mw-redirect" title="Draft (nautical)">Draft (nautical)</a><span data-mw-comment-end="h-Merge_in_Draft_(nautical)-2006-07-28T08:38:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=7" title="Edit section: Merge in Draft (nautical)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-Ratarsed-2006-07-28T08:38:00.000Z","type":"heading","level":0,"id":"h-Merge_in_Draft_(nautical)-2006-07-28T08:38:00.000Z","replies":["c-Ratarsed-2006-07-28T08:38:00.000Z-Merge_in_Draft_(nautical)","c-CP\\M-2006-07-28T08:42:00.000Z-Merge_in_Draft_(nautical)","c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)","timestamp":"2006-08-12T12:29:00.000Z"}__--><!--__DTCOMMENTCOUNT__3__--><!--__DTAUTHORCOUNT__3__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-Ratarsed-2006-07-28T08:38:00.000Z","type":"heading","level":0,"id":"h-Merge_in_Draft_(nautical)-2006-07-28T08:38:00.000Z","replies":["c-Ratarsed-2006-07-28T08:38:00.000Z-Merge_in_Draft_(nautical)","c-CP\\M-2006-07-28T08:42:00.000Z-Merge_in_Draft_(nautical)","c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)"],"text":"Merge in Draft (nautical)","linkableTitle":"Merge in Draft (nautical)"}--></div></div></div> <ul><li><b><span data-mw-comment-start="" id="c-Ratarsed-2006-07-28T08:38:00.000Z-Merge_in_Draft_(nautical)"></span>Oppose</b> - I don't think it is appropriate to merge <a href="/wiki/Draft_(nautical)" class="mw-redirect" title="Draft (nautical)">Draft (nautical)</a> in here. The draft may measure the clearance required for the hull, but The air draft is a measure of the clearance required above the waterline (under bridges, through tunnels, etc.). A better option would be to make more of the article, in my opinion. -- <a href="/wiki/User:Ratarsed" title="User:Ratarsed">Ratarsed</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Ratarsed-2006-07-28T08:38:00.000Z-Merge_in_Draft_(nautical)" class="ext-discussiontools-init-timestamplink">08:38, 28 July 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Ratarsed-2006-07-28T08:38:00.000Z-Merge_in_Draft_(nautical)"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-07-28T08:38:00.000Z","author":"Ratarsed","type":"comment","level":2,"id":"c-Ratarsed-2006-07-28T08:38:00.000Z-Merge_in_Draft_(nautical)","replies":[]}}--></span><span data-mw-comment-end="c-Ratarsed-2006-07-28T08:38:00.000Z-Merge_in_Draft_(nautical)"></span></li> <li><b><span data-mw-comment-start="" id="c-CP\M-2006-07-28T08:42:00.000Z-Merge_in_Draft_(nautical)"></span>Oppose</b> - Draft is a separate term, also per Ratarsed. <a href="/wiki/User:CP%5CM" title="User:CP\M">CP/M</a> (<a href="/wiki/Wikipedia:Neutrality_Project" class="mw-redirect" title="Wikipedia:Neutrality Project">Wikipedia Neutrality Project</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-CP\M-2006-07-28T08:42:00.000Z-Merge_in_Draft_(nautical)" class="ext-discussiontools-init-timestamplink">08:42, 28 July 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-CP\M-2006-07-28T08:42:00.000Z-Merge_in_Draft_(nautical)"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-07-28T08:42:00.000Z","author":"CP\\M","type":"comment","level":2,"id":"c-CP\\M-2006-07-28T08:42:00.000Z-Merge_in_Draft_(nautical)","replies":[],"displayName":"CP\/M"}}--></span><span data-mw-comment-end="c-CP\M-2006-07-28T08:42:00.000Z-Merge_in_Draft_(nautical)"></span></li> <li><b><span data-mw-comment-start="" id="c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)"></span>Oppose</b> - Draft is already defined here, the <a href="/wiki/Draft_(nautical)" class="mw-redirect" title="Draft (nautical)">Draft (nautical)</a> entry expands on the definition and adds value. I would suggest adding the following to the <a href="/wiki/Draft_(nautical)" class="mw-redirect" title="Draft (nautical)">Draft (nautical)</a> article" <ul><li>Draft Marks</li> <li>an image to show "draft" and one to show "draft marks"</li> <li>text on the difference between max draft (the draft to the lowest point on the ship) and hull draft (usually used to compute hydrostatics.</li></ul></li></ul> <p><a href="/wiki/User:Jmvolc" title="User:Jmvolc">Jmvolc</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)" class="ext-discussiontools-init-timestamplink">12:29, 12 August 2006 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2006-08-12T12:29:00.000Z","author":"Jmvolc","type":"comment","level":1,"id":"c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)","replies":[]}}--></span><span data-mw-comment-end="c-Jmvolc-2006-08-12T12:29:00.000Z-Merge_in_Draft_(nautical)"></span> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-Jmvolc-2007-04-05T01:45:00.000Z","type":"heading","level":0,"id":"h-Form_Coefficients-2007-04-05T01:45:00.000Z","replies":["c-Jmvolc-2007-04-05T01:45:00.000Z-Form_Coefficients","c-Jmvolc-2007-04-06T12:30:00.000Z-Form_Coefficients"],"text":"Form Coefficients","linkableTitle":"Form Coefficients"}--><h2 id="Form_Coefficients" data-mw-thread-id="h-Form_Coefficients-2007-04-05T01:45:00.000Z"><span data-mw-comment-start="" id="h-Form_Coefficients-2007-04-05T01:45:00.000Z"></span>Form Coefficients<span data-mw-comment-end="h-Form_Coefficients-2007-04-05T01:45:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=8" title="Edit section: Form Coefficients"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-Jmvolc-2007-04-05T01:45:00.000Z","type":"heading","level":0,"id":"h-Form_Coefficients-2007-04-05T01:45:00.000Z","replies":["c-Jmvolc-2007-04-05T01:45:00.000Z-Form_Coefficients","c-Jmvolc-2007-04-06T12:30:00.000Z-Form_Coefficients"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-Billymac00-2008-02-16T04:12:00.000Z-Georgewilliamherbert-2007-04-05T03:16:00.000Z","timestamp":"2008-02-16T04:12:00.000Z"}__--><!--__DTCOMMENTCOUNT__5__--><!--__DTAUTHORCOUNT__3__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-Jmvolc-2007-04-05T01:45:00.000Z","type":"heading","level":0,"id":"h-Form_Coefficients-2007-04-05T01:45:00.000Z","replies":["c-Jmvolc-2007-04-05T01:45:00.000Z-Form_Coefficients","c-Jmvolc-2007-04-06T12:30:00.000Z-Form_Coefficients"],"text":"Form Coefficients","linkableTitle":"Form Coefficients"}--></div></div></div> <p><span data-mw-comment-start="" id="c-Jmvolc-2007-04-05T01:45:00.000Z-Form_Coefficients"></span>Some of the descriptions and formulas given under Coefficients are incorrect. For example, are coefficients are based on measures on the design WL (LWL, BWL). Additionally, the text describing the influence of the various coefficients is probably better suited to be relocated to its own article on ship motions. These changes will be made shortly unless there is any objection. <a href="/wiki/User:Jmvolc" title="User:Jmvolc">Jmvolc</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Jmvolc-2007-04-05T01:45:00.000Z-Form_Coefficients" class="ext-discussiontools-init-timestamplink">01:45, 5 April 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Jmvolc-2007-04-05T01:45:00.000Z-Form_Coefficients"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-04-05T01:45:00.000Z","author":"Jmvolc","type":"comment","level":1,"id":"c-Jmvolc-2007-04-05T01:45:00.000Z-Form_Coefficients","replies":["c-Georgewilliamherbert-2007-04-05T03:14:00.000Z-Jmvolc-2007-04-05T01:45:00.000Z"]}}--></span><span data-mw-comment-end="c-Jmvolc-2007-04-05T01:45:00.000Z-Form_Coefficients"></span> </p> <dl><dd><i><span data-mw-comment-start="" id="c-Georgewilliamherbert-2007-04-05T03:14:00.000Z-Jmvolc-2007-04-05T01:45:00.000Z"></span>Objection</i>: I don't know what source you're using, but mine is the late 1980s (latest) edition of "Principles of Naval Architecture", and as I recall it defines the block, prismatic, and waterplane coefficients relating to length between perpendiculars (Lpp) not Lwl. Your source is... ? <a href="/wiki/User:Georgewilliamherbert" title="User:Georgewilliamherbert">Georgewilliamherbert</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Georgewilliamherbert-2007-04-05T03:14:00.000Z-Jmvolc-2007-04-05T01:45:00.000Z" class="ext-discussiontools-init-timestamplink">03:14, 5 April 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Georgewilliamherbert-2007-04-05T03:14:00.000Z-Jmvolc-2007-04-05T01:45:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-04-05T03:14:00.000Z","author":"Georgewilliamherbert","type":"comment","level":2,"id":"c-Georgewilliamherbert-2007-04-05T03:14:00.000Z-Jmvolc-2007-04-05T01:45:00.000Z","replies":["c-Georgewilliamherbert-2007-04-05T03:16:00.000Z-Georgewilliamherbert-2007-04-05T03:14:00.000Z"]}}--></span><span data-mw-comment-end="c-Georgewilliamherbert-2007-04-05T03:14:00.000Z-Jmvolc-2007-04-05T01:45:00.000Z"></span> <dl><dd><span data-mw-comment-start="" id="c-Georgewilliamherbert-2007-04-05T03:16:00.000Z-Georgewilliamherbert-2007-04-05T03:14:00.000Z"></span>(followup) Yes, I know you're a practicing NA and I'm not, though I have the degree, but can you recheck the PNA first? I will as well. <a href="/wiki/User:Georgewilliamherbert" title="User:Georgewilliamherbert">Georgewilliamherbert</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Georgewilliamherbert-2007-04-05T03:16:00.000Z-Georgewilliamherbert-2007-04-05T03:14:00.000Z" class="ext-discussiontools-init-timestamplink">03:16, 5 April 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Georgewilliamherbert-2007-04-05T03:16:00.000Z-Georgewilliamherbert-2007-04-05T03:14:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-04-05T03:16:00.000Z","author":"Georgewilliamherbert","type":"comment","level":3,"id":"c-Georgewilliamherbert-2007-04-05T03:16:00.000Z-Georgewilliamherbert-2007-04-05T03:14:00.000Z","replies":["c-Billymac00-2008-02-16T04:12:00.000Z-Georgewilliamherbert-2007-04-05T03:16:00.000Z"]}}--></span><span data-mw-comment-end="c-Georgewilliamherbert-2007-04-05T03:16:00.000Z-Georgewilliamherbert-2007-04-05T03:14:00.000Z"></span><br/> <dl><dd><span data-mw-comment-start="" id="c-Billymac00-2008-02-16T04:12:00.000Z-Georgewilliamherbert-2007-04-05T03:16:00.000Z"></span>I added citation and consulted Rawson&Tupper, and note it specifies LWL for Cwp, LPP for Cp and Cb...I recommend these forms--<a href="/wiki/User:Billymac00" title="User:Billymac00">Billymac00</a> (<a href="/wiki/User_talk:Billymac00" title="User talk:Billymac00">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Billymac00-2008-02-16T04:12:00.000Z-Georgewilliamherbert-2007-04-05T03:16:00.000Z" class="ext-discussiontools-init-timestamplink">04:12, 16 February 2008 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Billymac00-2008-02-16T04:12:00.000Z-Georgewilliamherbert-2007-04-05T03:16:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2008-02-16T04:12:00.000Z","author":"Billymac00","type":"comment","level":4,"id":"c-Billymac00-2008-02-16T04:12:00.000Z-Georgewilliamherbert-2007-04-05T03:16:00.000Z","replies":[]}}--></span><span data-mw-comment-end="c-Billymac00-2008-02-16T04:12:00.000Z-Georgewilliamherbert-2007-04-05T03:16:00.000Z"></span></dd></dl></dd></dl></dd></dl> <p><span data-mw-comment-start="" id="c-Jmvolc-2007-04-06T12:30:00.000Z-Form_Coefficients"></span>It was not my intention to detract from the contributions you have made. An open discussion of this nature is very worthwhile and key to assuring that the article is based on fact, not opinion. LBP is an arbitrary number as the Aft Perpendicular is alternately defined as the forward edge of center of the rudder stock depending on your reference. Neither of these positions have anything to do with the actual form of the hull. </p><p>Principles of Naval Architecture is a good reference. Volume 1, Page 18 of the 1988 edition states that "Some authorities take L as LBP some as LWL, and some as effective length." The authorities referred to are primarily classification societies that also use Lr or Rule Length when calculating form coefficients. Given that the article is about defining the hull in general terms I thought it would be wise to follow the guidelines set out by Saunders in "Hydrodynamics in Ship Design" back in 1957. This definition is still used by the ITTC, etc. for definitions of form. Let me know if this works for you. <a href="/wiki/User:Jmvolc" title="User:Jmvolc">Jmvolc</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Jmvolc-2007-04-06T12:30:00.000Z-Form_Coefficients" class="ext-discussiontools-init-timestamplink">12:30, 6 April 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Jmvolc-2007-04-06T12:30:00.000Z-Form_Coefficients"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-04-06T12:30:00.000Z","author":"Jmvolc","type":"comment","level":1,"id":"c-Jmvolc-2007-04-06T12:30:00.000Z-Form_Coefficients","replies":[]}}--></span><span data-mw-comment-end="c-Jmvolc-2007-04-06T12:30:00.000Z-Form_Coefficients"></span> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-Kablammo-2007-10-24T16:08:00.000Z","type":"heading","level":0,"id":"h-Depth-2007-10-24T16:08:00.000Z","replies":["c-Kablammo-2007-10-24T16:08:00.000Z-Depth"],"text":"Depth","linkableTitle":"Depth"}--><h2 id="Depth" data-mw-thread-id="h-Depth-2007-10-24T16:08:00.000Z"><span data-mw-comment-start="" id="h-Depth-2007-10-24T16:08:00.000Z"></span>Depth<span data-mw-comment-end="h-Depth-2007-10-24T16:08:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=9" title="Edit section: Depth"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-Kablammo-2007-10-24T16:08:00.000Z","type":"heading","level":0,"id":"h-Depth-2007-10-24T16:08:00.000Z","replies":["c-Kablammo-2007-10-24T16:08:00.000Z-Depth"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-Kablammo-2007-10-27T10:30:00.000Z-Kablammo-2007-10-25T12:27:00.000Z","timestamp":"2007-10-27T10:30:00.000Z"}__--><!--__DTCOMMENTCOUNT__5__--><!--__DTAUTHORCOUNT__2__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-Kablammo-2007-10-24T16:08:00.000Z","type":"heading","level":0,"id":"h-Depth-2007-10-24T16:08:00.000Z","replies":["c-Kablammo-2007-10-24T16:08:00.000Z-Depth"],"text":"Depth","linkableTitle":"Depth"}--></div></div></div> <p><i><span data-mw-comment-start="" id="c-Kablammo-2007-10-24T16:08:00.000Z-Depth"></span>Metrics</i> includes the following definition of <i>Depth</i> (<b>D</b>): </p> <dl><dd>Depth (D) is the vertical distance from the bottom of the hull to the uppermost edge at the side.</dd></dl> <p>This does not seem to fit well with <a href="/wiki/Whaleback" title="Whaleback">whaleback</a> ships and may not be applicable to all <a href="/wiki/Turret_deck_ship" title="Turret deck ship">turret deck ships</a>. <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2007-10-24T16:08:00.000Z-Depth" class="ext-discussiontools-init-timestamplink">16:08, 24 October 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2007-10-24T16:08:00.000Z-Depth"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-10-24T16:08:00.000Z","author":"Kablammo","type":"comment","level":1,"id":"c-Kablammo-2007-10-24T16:08:00.000Z-Depth","replies":["c-Georgewilliamherbert-2007-10-25T02:04:00.000Z-Kablammo-2007-10-24T16:08:00.000Z"]}}--></span><span data-mw-comment-end="c-Kablammo-2007-10-24T16:08:00.000Z-Depth"></span> </p> <dl><dd><span data-mw-comment-start="" id="c-Georgewilliamherbert-2007-10-25T02:04:00.000Z-Kablammo-2007-10-24T16:08:00.000Z"></span>That's the way it's defined, though. <a href="/wiki/User:Georgewilliamherbert" title="User:Georgewilliamherbert">Georgewilliamherbert</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Georgewilliamherbert-2007-10-25T02:04:00.000Z-Kablammo-2007-10-24T16:08:00.000Z" class="ext-discussiontools-init-timestamplink">02:04, 25 October 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Georgewilliamherbert-2007-10-25T02:04:00.000Z-Kablammo-2007-10-24T16:08:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-10-25T02:04:00.000Z","author":"Georgewilliamherbert","type":"comment","level":2,"id":"c-Georgewilliamherbert-2007-10-25T02:04:00.000Z-Kablammo-2007-10-24T16:08:00.000Z","replies":["c-Kablammo-2007-10-25T10:02:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z","c-Kablammo-2007-10-25T12:27:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z"]}}--></span><span data-mw-comment-end="c-Georgewilliamherbert-2007-10-25T02:04:00.000Z-Kablammo-2007-10-24T16:08:00.000Z"></span> <dl><dd><span data-mw-comment-start="" id="c-Kablammo-2007-10-25T10:02:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z"></span>That raises the question of what the <i>uppermost edge at the side</i> is on a turret or whaleback ship, which does not have an outside edge but only a curve where the <a href="/wiki/Gunwale" title="Gunwale">gunwale</a> normally would be found. Has the definition changed over time? <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2007-10-25T10:02:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z" class="ext-discussiontools-init-timestamplink">10:02, 25 October 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2007-10-25T10:02:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-10-25T10:02:00.000Z","author":"Kablammo","type":"comment","level":3,"id":"c-Kablammo-2007-10-25T10:02:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z","replies":[]}}--></span><span data-mw-comment-end="c-Kablammo-2007-10-25T10:02:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z"></span></dd> <dd><span data-mw-comment-start="" id="c-Kablammo-2007-10-25T12:27:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z"></span>In turret deck ships the practice may have been inconsistent. A little book put out by the <a href="/wiki/National_Maritime_Museum" title="National Maritime Museum">National Maritime Museum</a> entitled <i>Steam Tramps and Cargo Liners</i> reproduces drawings from a paper by J. Foster King entitled <i>Structural developments in British merchant ships</i> from <i>Transactions of the Institute of Naval Architects</i> XLIX (1907), which show cross-sections of two turret deck ships. The depth of <i>SS Turret</i> of 1892 apparently was measured from the bottom to the horizontal part of the "side" of the hull, that is, where the side curves to a horizontal plane before arcing back to vertical (there being no "edge" present). <i>SS Queda</i> of 1905 however has two depth figures, one measured as in <i>SS Turret</i>, the other of which appears to be measured further inboard and higher, where the true deck meets the inboard and upper part of the "side" of the hull at right angles (and therefore forms an edge). (Difficult to explain without a drawing.) Perhaps the profession or rating authorities had difficulty applying standard definitions to these anomalous vessels. <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2007-10-25T12:27:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z" class="ext-discussiontools-init-timestamplink">12:27, 25 October 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2007-10-25T12:27:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-10-25T12:27:00.000Z","author":"Kablammo","type":"comment","level":3,"id":"c-Kablammo-2007-10-25T12:27:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z","replies":["c-Kablammo-2007-10-27T10:30:00.000Z-Kablammo-2007-10-25T12:27:00.000Z"]}}--></span><span data-mw-comment-end="c-Kablammo-2007-10-25T12:27:00.000Z-Georgewilliamherbert-2007-10-25T02:04:00.000Z"></span> <dl><dd><span data-mw-comment-start="" id="c-Kablammo-2007-10-27T10:30:00.000Z-Kablammo-2007-10-25T12:27:00.000Z"></span>Now answered, by reference to more refined definitions in 1969 convention. <a href="/wiki/User:Kablammo" class="mw-redirect" title="User:Kablammo">Kablammo</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Kablammo-2007-10-27T10:30:00.000Z-Kablammo-2007-10-25T12:27:00.000Z" class="ext-discussiontools-init-timestamplink">10:30, 27 October 2007 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Kablammo-2007-10-27T10:30:00.000Z-Kablammo-2007-10-25T12:27:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2007-10-27T10:30:00.000Z","author":"Kablammo","type":"comment","level":4,"id":"c-Kablammo-2007-10-27T10:30:00.000Z-Kablammo-2007-10-25T12:27:00.000Z","replies":[]}}--></span><span data-mw-comment-end="c-Kablammo-2007-10-27T10:30:00.000Z-Kablammo-2007-10-25T12:27:00.000Z"></span></dd></dl></dd></dl></dd></dl> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-87.66.60.155-2009-09-14T11:44:00.000Z","type":"heading","level":0,"id":"h-Air_cavity_hulls-2009-09-14T11:44:00.000Z","replies":["c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls"],"text":"Air cavity hulls","linkableTitle":"Air cavity hulls"}--><h2 id="Air_cavity_hulls" data-mw-thread-id="h-Air_cavity_hulls-2009-09-14T11:44:00.000Z"><span data-mw-comment-start="" id="h-Air_cavity_hulls-2009-09-14T11:44:00.000Z"></span>Air cavity hulls<span data-mw-comment-end="h-Air_cavity_hulls-2009-09-14T11:44:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=10" title="Edit section: Air cavity hulls"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-87.66.60.155-2009-09-14T11:44:00.000Z","type":"heading","level":0,"id":"h-Air_cavity_hulls-2009-09-14T11:44:00.000Z","replies":["c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls","timestamp":"2009-09-14T11:44:00.000Z"}__--><!--__DTCOMMENTCOUNT__1__--><!--__DTAUTHORCOUNT__1__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-87.66.60.155-2009-09-14T11:44:00.000Z","type":"heading","level":0,"id":"h-Air_cavity_hulls-2009-09-14T11:44:00.000Z","replies":["c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls"],"text":"Air cavity hulls","linkableTitle":"Air cavity hulls"}--></div></div></div> <p><span data-mw-comment-start="" id="c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls"></span>Air cavity hulls aren't mentioned; see <a rel="nofollow" class="external free" href="http://www.patentstorm.us/patents/6167829/description.html">http://www.patentstorm.us/patents/6167829/description.html</a> <span style="font-size: smaller;" class="autosigned">—Preceding <a href="/wiki/Wikipedia:Signatures" title="Wikipedia:Signatures">unsigned</a> comment added by <a href="/wiki/Special:Contributions/87.66.60.155" title="Special:Contributions/87.66.60.155">87.66.60.155</a> (<a href="/w/index.php?title=User_talk:87.66.60.155&action=edit&redlink=1" class="new" title="User talk:87.66.60.155 (page does not exist)">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls" class="ext-discussiontools-init-timestamplink">11:44, 14 September 2009 (UTC)</a></span><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2009-09-14T11:44:00.000Z","author":"87.66.60.155","type":"comment","level":1,"id":"c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls","replies":[]}}--></span><span data-mw-comment-end="c-87.66.60.155-2009-09-14T11:44:00.000Z-Air_cavity_hulls"></span> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-Soerfm-2011-12-30T21:31:00.000Z","type":"heading","level":0,"id":"h-Moulded_breadth-2011-12-30T21:31:00.000Z","replies":["c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth"],"text":"Moulded breadth","linkableTitle":"Moulded breadth"}--><h2 id="Moulded_breadth" data-mw-thread-id="h-Moulded_breadth-2011-12-30T21:31:00.000Z"><span data-mw-comment-start="" id="h-Moulded_breadth-2011-12-30T21:31:00.000Z"></span>Moulded breadth<span data-mw-comment-end="h-Moulded_breadth-2011-12-30T21:31:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=11" title="Edit section: Moulded breadth"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-Soerfm-2011-12-30T21:31:00.000Z","type":"heading","level":0,"id":"h-Moulded_breadth-2011-12-30T21:31:00.000Z","replies":["c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth","timestamp":"2011-12-30T21:31:00.000Z"}__--><!--__DTCOMMENTCOUNT__1__--><!--__DTAUTHORCOUNT__1__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-Soerfm-2011-12-30T21:31:00.000Z","type":"heading","level":0,"id":"h-Moulded_breadth-2011-12-30T21:31:00.000Z","replies":["c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth"],"text":"Moulded breadth","linkableTitle":"Moulded breadth"}--></div></div></div> <p><span data-mw-comment-start="" id="c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth"></span>Please define. <a href="/wiki/User:Soerfm" title="User:Soerfm">Soerfm</a> (<a href="/wiki/User_talk:Soerfm" title="User talk:Soerfm">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth" class="ext-discussiontools-init-timestamplink">21:31, 30 December 2011 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2011-12-30T21:31:00.000Z","author":"Soerfm","type":"comment","level":1,"id":"c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth","replies":[]}}--></span><span data-mw-comment-end="c-Soerfm-2011-12-30T21:31:00.000Z-Moulded_breadth"></span> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-GPS_Pilot-2012-12-28T15:15:00.000Z","type":"heading","level":0,"id":"h-Efficiency_of_planing_hulls-2012-12-28T15:15:00.000Z","replies":["c-GPS_Pilot-2012-12-28T15:15:00.000Z-Efficiency_of_planing_hulls"],"text":"Efficiency of planing hulls","linkableTitle":"Efficiency of planing hulls"}--><h2 id="Efficiency_of_planing_hulls" data-mw-thread-id="h-Efficiency_of_planing_hulls-2012-12-28T15:15:00.000Z"><span data-mw-comment-start="" id="h-Efficiency_of_planing_hulls-2012-12-28T15:15:00.000Z"></span>Efficiency of planing hulls<span data-mw-comment-end="h-Efficiency_of_planing_hulls-2012-12-28T15:15:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=12" title="Edit section: Efficiency of planing hulls"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-GPS_Pilot-2012-12-28T15:15:00.000Z","type":"heading","level":0,"id":"h-Efficiency_of_planing_hulls-2012-12-28T15:15:00.000Z","replies":["c-GPS_Pilot-2012-12-28T15:15:00.000Z-Efficiency_of_planing_hulls"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-95.148.221.26-2015-06-09T12:34:00.000Z-GPS_Pilot-2012-12-28T15:15:00.000Z","timestamp":"2015-06-09T12:34:00.000Z"}__--><!--__DTCOMMENTCOUNT__2__--><!--__DTAUTHORCOUNT__2__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-GPS_Pilot-2012-12-28T15:15:00.000Z","type":"heading","level":0,"id":"h-Efficiency_of_planing_hulls-2012-12-28T15:15:00.000Z","replies":["c-GPS_Pilot-2012-12-28T15:15:00.000Z-Efficiency_of_planing_hulls"],"text":"Efficiency of planing hulls","linkableTitle":"Efficiency of planing hulls"}--></div></div></div> <p><i><span data-mw-comment-start="" id="c-GPS_Pilot-2012-12-28T15:15:00.000Z-Efficiency_of_planing_hulls"></span>Planing hulls are more efficient at higher speeds, although they still require more energy to achieve these speeds.</i> </p><p>The phrase "more efficient" is typically defined as, "using less energy or fewer resources to achieve the same result." If a planing hull requires more energy to achieve a given speed than another type of hull, it is <i>less efficient</i> -- unless the author is using some non-standard definition of "more efficient." Either way, this sentence needs a rewrite to reduce confusion. <a href="/w/index.php?title=User:GPS_Pilot&action=edit&redlink=1" class="new" title="User:GPS Pilot (page does not exist)">GPS Pilot</a> (<a href="/wiki/User_talk:GPS_Pilot" title="User talk:GPS Pilot">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-GPS_Pilot-2012-12-28T15:15:00.000Z-Efficiency_of_planing_hulls" class="ext-discussiontools-init-timestamplink">15:15, 28 December 2012 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-GPS_Pilot-2012-12-28T15:15:00.000Z-Efficiency_of_planing_hulls"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2012-12-28T15:15:00.000Z","author":"GPS Pilot","type":"comment","level":1,"id":"c-GPS_Pilot-2012-12-28T15:15:00.000Z-Efficiency_of_planing_hulls","replies":["c-95.148.221.26-2015-06-09T12:34:00.000Z-GPS_Pilot-2012-12-28T15:15:00.000Z"]}}--></span><span data-mw-comment-end="c-GPS_Pilot-2012-12-28T15:15:00.000Z-Efficiency_of_planing_hulls"></span> </p> <dl><dd><span data-mw-comment-start="" id="c-95.148.221.26-2015-06-09T12:34:00.000Z-GPS_Pilot-2012-12-28T15:15:00.000Z"></span>A planing hull requires more power to initially get it up on the 'step' but once there requires less power for a given speed than a displacement hull does. Hence overall it is more efficient, due to less of the hull being 'wetted' and causing hydrodynamic drag. For this reason all <a href="/wiki/Flying_boat" title="Flying boat">flying boats</a> and other <a href="/wiki/Seaplane" title="Seaplane">seaplanes</a> always have planing bottoms to their hulls or <a href="/wiki/Float_(nautical)" title="Float (nautical)">floats</a>. OTOH, helicopters required to operate from water usually do not, having instead plain <a href="/wiki/Pontoon" class="mw-disambig" title="Pontoon">pontoons</a> due to being able to take-off vertically. <small class="autosigned">— Preceding <a href="/wiki/Wikipedia:Signatures" title="Wikipedia:Signatures">unsigned</a> comment added by <a href="/wiki/Special:Contributions/95.148.221.26" title="Special:Contributions/95.148.221.26">95.148.221.26</a> (<a href="/wiki/User_talk:95.148.221.26" title="User talk:95.148.221.26">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-95.148.221.26-2015-06-09T12:34:00.000Z-GPS_Pilot-2012-12-28T15:15:00.000Z" class="ext-discussiontools-init-timestamplink">12:34, 9 June 2015 (UTC)</a><span data-mw-comment-end="c-95.148.221.26-2015-06-09T12:34:00.000Z-GPS_Pilot-2012-12-28T15:15:00.000Z"></span></small><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-95.148.221.26-2015-06-09T12:34:00.000Z-GPS_Pilot-2012-12-28T15:15:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2015-06-09T12:34:00.000Z","author":"95.148.221.26","type":"comment","level":2,"id":"c-95.148.221.26-2015-06-09T12:34:00.000Z-GPS_Pilot-2012-12-28T15:15:00.000Z","replies":[]}}--></span></dd></dl> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-Pnoble805-2013-06-30T05:14:00.000Z","type":"heading","level":0,"id":"h-Stepped_Hull-2013-06-30T05:14:00.000Z","replies":["c-Pnoble805-2013-06-30T05:14:00.000Z-Stepped_Hull","c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull"],"text":"Stepped Hull","linkableTitle":"Stepped Hull"}--><h2 id="Stepped_Hull" data-mw-thread-id="h-Stepped_Hull-2013-06-30T05:14:00.000Z"><span data-mw-comment-start="" id="h-Stepped_Hull-2013-06-30T05:14:00.000Z"></span>Stepped Hull<span data-mw-comment-end="h-Stepped_Hull-2013-06-30T05:14:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=13" title="Edit section: Stepped Hull"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-Pnoble805-2013-06-30T05:14:00.000Z","type":"heading","level":0,"id":"h-Stepped_Hull-2013-06-30T05:14:00.000Z","replies":["c-Pnoble805-2013-06-30T05:14:00.000Z-Stepped_Hull","c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull","timestamp":"2015-06-09T12:50:00.000Z"}__--><!--__DTCOMMENTCOUNT__2__--><!--__DTAUTHORCOUNT__2__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-Pnoble805-2013-06-30T05:14:00.000Z","type":"heading","level":0,"id":"h-Stepped_Hull-2013-06-30T05:14:00.000Z","replies":["c-Pnoble805-2013-06-30T05:14:00.000Z-Stepped_Hull","c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull"],"text":"Stepped Hull","linkableTitle":"Stepped Hull"}--></div></div></div> <p><span data-mw-comment-start="" id="c-Pnoble805-2013-06-30T05:14:00.000Z-Stepped_Hull"></span>I was reading the <a href="/wiki/Motorboat" title="Motorboat">motorboat</a> article and noticed a mention of the "first successful step hydroplane." Wondering what that was, I checked out <a href="/wiki/Hydroplane" class="mw-disambig" title="Hydroplane">hydroplane</a> and found the term "stepped hull." The term stepped hull appears in Wikipedia quite a bit, but no one creates a link or attempts to explain what it means. I found a rather detailed article at Soundings Online titled "<a rel="nofollow" class="external text" href="http://www.soundingsonline.com/boat-shop/on-powerboats/287360-the-stepped-hull-has-come-of-age">The Stepped Hull Has Come of Age</a>". Perhaps someone could interpret this and add the concepts "stepped hull" and "unstepped hull" to the hull article, and then create articles on each? Someone could then create the links throughout Wikipedia. I barely understand the step concept and figure someone with nautical experience should write those. </p><p>I write history articles for a blog about Matawan and Aberdeen NJ USA and am looking at a front page article in the <a rel="nofollow" class="external text" href="http://173.12.11.248/DATA/1900-24/1913/1913-06-26.pdf">26 June 1913 edition</a> of The Matawan Journal referencing a "crazy speed boat" being designed by an Allie Haviland of Red Bank, NJ. The boat was expected to exceed fifty miles an hour and be the first of its kind when it was launched. The boat would have an eight-cylinder 60 HP engine. Any thoughts on that would be of interest to me. <a href="/wiki/User:Pnoble805" title="User:Pnoble805">Pnoble805</a> (<a href="/wiki/User_talk:Pnoble805" title="User talk:Pnoble805">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-Pnoble805-2013-06-30T05:14:00.000Z-Stepped_Hull" class="ext-discussiontools-init-timestamplink">05:14, 30 June 2013 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-Pnoble805-2013-06-30T05:14:00.000Z-Stepped_Hull"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2013-06-30T05:14:00.000Z","author":"Pnoble805","type":"comment","level":1,"id":"c-Pnoble805-2013-06-30T05:14:00.000Z-Stepped_Hull","replies":[]}}--></span><span data-mw-comment-end="c-Pnoble805-2013-06-30T05:14:00.000Z-Stepped_Hull"></span> </p> <span data-mw-comment-start="" id="c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull"></span><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Short_Sunderland_Mk_V.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Short_Sunderland_Mk_V.jpg/220px-Short_Sunderland_Mk_V.jpg" decoding="async" width="220" height="144" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Short_Sunderland_Mk_V.jpg/330px-Short_Sunderland_Mk_V.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Short_Sunderland_Mk_V.jpg/440px-Short_Sunderland_Mk_V.jpg 2x" data-file-width="591" data-file-height="386"/></a><figcaption>A <a href="/wiki/Short_Sunderland" title="Short Sunderland">Sunderland Mk V</a>. The 'step' in the hull can be seen as a change in line half way along the bottom of the hull. This means that on take-off as the aircraft rises in the water the rear of the hull leaves the water first, allowing air to then flow under the remainder and so breaking the suction holding the aircraft to the water.</figcaption></figure> <dl><dd>A 'step' is a discontinuity in the hull line intended to allow air under the hull in order to break the suction holding the hull in the water. The step was invented by <a href="/wiki/John_Cyril_Porte" title="John Cyril Porte">John Porte</a> when he was designing a new hull for the <a href="/wiki/Felixstowe_F.1" title="Felixstowe F.1">Felixstowe F.1</a> <a href="/wiki/Flying_boat" title="Flying boat">flying boat</a> in WW I, the step making take-off more easier than in previous hull designs which had difficulty breaking free of the water surface.</dd></dl> <dl><dd>In a hydroplane the step allows the hull to rise more easily out of the water to the planing position, whereupon it is said to be 'on the step'.</dd></dl> <dl><dd>A 'step' is most useful when operating on sheltered water where the water is flat calm, such as lakes or rivers, as opposed to the open sea, where the action of the waves tend to assist with breaking the water suction.<small class="autosigned">— Preceding <a href="/wiki/Wikipedia:Signatures" title="Wikipedia:Signatures">unsigned</a> comment added by <a href="/wiki/Special:Contributions/95.148.221.26" title="Special:Contributions/95.148.221.26">95.148.221.26</a> (<a href="/wiki/User_talk:95.148.221.26" title="User talk:95.148.221.26">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull" class="ext-discussiontools-init-timestamplink">12:50, 9 June 2015 (UTC)</a><span data-mw-comment-end="c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull"></span></small><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2015-06-09T12:50:00.000Z","author":"95.148.221.26","type":"comment","level":1,"id":"c-95.148.221.26-2015-06-09T12:50:00.000Z-Stepped_Hull","replies":[]}}--></span></dd></dl> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-HopsonRoad-2017-06-10T10:37:00.000Z","type":"heading","level":0,"id":"h-History_section_underdeveloped-2017-06-10T10:37:00.000Z","replies":["c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped"],"text":"History section underdeveloped","linkableTitle":"History section underdeveloped"}--><h2 id="History_section_underdeveloped" data-mw-thread-id="h-History_section_underdeveloped-2017-06-10T10:37:00.000Z"><span data-mw-comment-start="" id="h-History_section_underdeveloped-2017-06-10T10:37:00.000Z"></span>History section underdeveloped<span data-mw-comment-end="h-History_section_underdeveloped-2017-06-10T10:37:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=14" title="Edit section: History section underdeveloped"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-HopsonRoad-2017-06-10T10:37:00.000Z","type":"heading","level":0,"id":"h-History_section_underdeveloped-2017-06-10T10:37:00.000Z","replies":["c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped","timestamp":"2017-06-10T10:37:00.000Z"}__--><!--__DTCOMMENTCOUNT__1__--><!--__DTAUTHORCOUNT__1__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-HopsonRoad-2017-06-10T10:37:00.000Z","type":"heading","level":0,"id":"h-History_section_underdeveloped-2017-06-10T10:37:00.000Z","replies":["c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped"],"text":"History section underdeveloped","linkableTitle":"History section underdeveloped"}--></div></div></div> <p><span data-mw-comment-start="" id="c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped"></span>I'm moving the History section upwards to its usual place in WP article structure. In the meantime it needs development and lacks references. <a href="/wiki/User:HopsonRoad" title="User:HopsonRoad">User:HopsonRoad</a> <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped" class="ext-discussiontools-init-timestamplink">10:37, 10 June 2017 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2017-06-10T10:37:00.000Z","author":"HopsonRoad","type":"comment","level":1,"id":"c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped","replies":[],"displayName":"User:HopsonRoad"}}--></span><span data-mw-comment-end="c-HopsonRoad-2017-06-10T10:37:00.000Z-History_section_underdeveloped"></span> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-185.4.43.93-2018-07-13T08:40:00.000Z","type":"heading","level":0,"id":"h-Is_this_correct?-2018-07-13T08:40:00.000Z","replies":["c-185.4.43.93-2018-07-13T08:40:00.000Z-Is_this_correct?"],"text":"Is this correct?","linkableTitle":"Is this correct?"}--><h2 id="Is_this_correct?" data-mw-thread-id="h-Is_this_correct?-2018-07-13T08:40:00.000Z"><span id="Is_this_correct.3F"></span><span data-mw-comment-start="" id="h-Is_this_correct?-2018-07-13T08:40:00.000Z"></span>Is this correct?<span data-mw-comment-end="h-Is_this_correct?-2018-07-13T08:40:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=15" title="Edit section: Is this correct?"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-185.4.43.93-2018-07-13T08:40:00.000Z","type":"heading","level":0,"id":"h-Is_this_correct?-2018-07-13T08:40:00.000Z","replies":["c-185.4.43.93-2018-07-13T08:40:00.000Z-Is_this_correct?"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-HopsonRoad-2018-07-14T12:18:00.000Z-185.4.43.93-2018-07-13T08:40:00.000Z","timestamp":"2018-07-14T12:18:00.000Z"}__--><!--__DTCOMMENTCOUNT__2__--><!--__DTAUTHORCOUNT__2__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-185.4.43.93-2018-07-13T08:40:00.000Z","type":"heading","level":0,"id":"h-Is_this_correct?-2018-07-13T08:40:00.000Z","replies":["c-185.4.43.93-2018-07-13T08:40:00.000Z-Is_this_correct?"],"text":"Is this correct?","linkableTitle":"Is this correct?"}--></div></div></div> <p><span data-mw-comment-start="" id="c-185.4.43.93-2018-07-13T08:40:00.000Z-Is_this_correct?"></span>Guys, I’m not a native speaker. But is this sentence correct? “Above the hull is the superstructure and/or deckhouse, where present.” It doesn’t make any sense to me. --<a href="/wiki/Special:Contributions/185.4.43.93" title="Special:Contributions/185.4.43.93">185.4.43.93</a> (<a href="/wiki/User_talk:185.4.43.93" title="User talk:185.4.43.93">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-185.4.43.93-2018-07-13T08:40:00.000Z-Is_this_correct?" class="ext-discussiontools-init-timestamplink">08:40, 13 July 2018 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-185.4.43.93-2018-07-13T08:40:00.000Z-Is_this_correct?"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2018-07-13T08:40:00.000Z","author":"185.4.43.93","type":"comment","level":1,"id":"c-185.4.43.93-2018-07-13T08:40:00.000Z-Is_this_correct?","replies":["c-HopsonRoad-2018-07-14T12:18:00.000Z-185.4.43.93-2018-07-13T08:40:00.000Z"]}}--></span><span data-mw-comment-end="c-185.4.43.93-2018-07-13T08:40:00.000Z-Is_this_correct?"></span> </p> <dl><dd><span data-mw-comment-start="" id="c-HopsonRoad-2018-07-14T12:18:00.000Z-185.4.43.93-2018-07-13T08:40:00.000Z"></span>It's certainly awkward, if logical. I've changed it to: "Atop the hull may be a <a href="/wiki/Deckhouse" class="mw-redirect" title="Deckhouse">deckhouse</a> or some other form of superstructure, like a <a href="/wiki/Mast_(sailing)" title="Mast (sailing)">mast</a>." Thanks for the tip. Of course, anyone may edit here, including you! Cheers, <a href="/wiki/User:HopsonRoad" title="User:HopsonRoad">HopsonRoad</a> (<a href="/wiki/User_talk:HopsonRoad" title="User talk:HopsonRoad">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-HopsonRoad-2018-07-14T12:18:00.000Z-185.4.43.93-2018-07-13T08:40:00.000Z" class="ext-discussiontools-init-timestamplink">12:18, 14 July 2018 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-HopsonRoad-2018-07-14T12:18:00.000Z-185.4.43.93-2018-07-13T08:40:00.000Z"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2018-07-14T12:18:00.000Z","author":"HopsonRoad","type":"comment","level":2,"id":"c-HopsonRoad-2018-07-14T12:18:00.000Z-185.4.43.93-2018-07-13T08:40:00.000Z","replies":[]}}--></span><span data-mw-comment-end="c-HopsonRoad-2018-07-14T12:18:00.000Z-185.4.43.93-2018-07-13T08:40:00.000Z"></span></dd></dl> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><!--__DTSUBSCRIBEBUTTONDESKTOP__{"headingLevel":2,"name":"h-LiamM32-2021-02-11T08:20:00.000Z","type":"heading","level":0,"id":"h-Which_\"Centaur\"_is_being_referenced?-2021-02-11T08:20:00.000Z","replies":["c-LiamM32-2021-02-11T08:20:00.000Z-Which_\"Centaur\"_is_being_referenced?"],"text":"Which \"Centaur\" is being referenced?","linkableTitle":"Which \"Centaur\" is being referenced?"}--><h2 id="Which_"Centaur"_is_being_referenced?" data-mw-thread-id="h-Which_"Centaur"_is_being_referenced?-2021-02-11T08:20:00.000Z"><span id="Which_.22Centaur.22_is_being_referenced.3F"></span><span data-mw-comment-start="" id="h-Which_"Centaur"_is_being_referenced?-2021-02-11T08:20:00.000Z"></span>Which "Centaur" is being referenced?<span data-mw-comment-end="h-Which_"Centaur"_is_being_referenced?-2021-02-11T08:20:00.000Z"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Talk:Hull_(watercraft)&action=edit&section=16" title="Edit section: Which "Centaur" is being referenced?"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span><!--__DTELLIPSISBUTTON__{"threadItem":{"headingLevel":2,"name":"h-LiamM32-2021-02-11T08:20:00.000Z","type":"heading","level":0,"id":"h-Which_\"Centaur\"_is_being_referenced?-2021-02-11T08:20:00.000Z","replies":["c-LiamM32-2021-02-11T08:20:00.000Z-Which_\"Centaur\"_is_being_referenced?"]}}--><div class="ext-discussiontools-init-section-bar"><div class="ext-discussiontools-init-section-metadata"><!--__DTLATESTCOMMENTTHREAD__{"id":"c-LiamM32-2021-02-11T08:20:00.000Z-Which_\"Centaur\"_is_being_referenced?","timestamp":"2021-02-11T08:20:00.000Z"}__--><!--__DTCOMMENTCOUNT__1__--><!--__DTAUTHORCOUNT__1__--></div><div class="ext-discussiontools-init-section-actions"><!--__DTSUBSCRIBEBUTTONMOBILE__{"headingLevel":2,"name":"h-LiamM32-2021-02-11T08:20:00.000Z","type":"heading","level":0,"id":"h-Which_\"Centaur\"_is_being_referenced?-2021-02-11T08:20:00.000Z","replies":["c-LiamM32-2021-02-11T08:20:00.000Z-Which_\"Centaur\"_is_being_referenced?"],"text":"Which \"Centaur\" is being referenced?","linkableTitle":"Which \"Centaur\" is being referenced?"}--></div></div></div> <p><span data-mw-comment-start="" id="c-LiamM32-2021-02-11T08:20:00.000Z-Which_"Centaur"_is_being_referenced?"></span>In the <a href="/wiki/Hull_(watercraft)#Smooth_curve_hulls" title="Hull (watercraft)"><i>Smooth curve hulls</i></a> section, a ship called the "Centaur" is said to have a semi-round bilge hull, with a link to the <a href="/wiki/Centaur" title="Centaur">mythical creature</a>. I am changing the link to <a href="/w/index.php?title=Centaur_(ship&action=edit&redlink=1" class="new" title="Centaur (ship (page does not exist)">Centaur (ship</a> (disambiguation page) because there have been multiple ships called "Centaur" and I don't know which one is being referenced. Does anyone know which <i>Centaur</i> ship has a semi-round bilge hull? --<a href="/w/index.php?title=User:LiamM32&action=edit&redlink=1" class="new" title="User:LiamM32 (page does not exist)">LiamM32</a> (<a href="/wiki/User_talk:LiamM32" title="User talk:LiamM32">talk</a>) <a href="https://en.wikipedia.org/wiki/Talk:Hull_(watercraft)#c-LiamM32-2021-02-11T08:20:00.000Z-Which_"Centaur"_is_being_referenced?" class="ext-discussiontools-init-timestamplink">08:20, 11 February 2021 (UTC)</a><span class="ext-discussiontools-init-replylink-buttons" data-mw-thread-id="c-LiamM32-2021-02-11T08:20:00.000Z-Which_"Centaur"_is_being_referenced?"><span class="ext-discussiontools-init-replylink-bracket">[</span><a class="ext-discussiontools-init-replylink-reply" role="button" tabindex="0" href="">reply</a><span class="ext-discussiontools-init-replylink-bracket">]</span><!--__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2021-02-11T08:20:00.000Z","author":"LiamM32","type":"comment","level":1,"id":"c-LiamM32-2021-02-11T08:20:00.000Z-Which_\"Centaur\"_is_being_referenced?","replies":[]}}--></span><span data-mw-comment-end="c-LiamM32-2021-02-11T08:20:00.000Z-Which_"Centaur"_is_being_referenced?"></span> </p> <!-- NewPP limit report Parsed by mw‐web.eqiad.main‐5dc468848‐8d5pq Cached time: 20241125033831 Cache expiry: 864000 Reduced expiry: true Complications: [vary‐revision‐sha1, show‐toc] DiscussionTools time usage: 0.035 seconds CPU time usage: 0.277 seconds Real time usage: 0.498 seconds Preprocessor visited node count: 423/1000000 Post‐expand include size: 29174/2097152 bytes Template argument size: 1046/2097152 bytes Highest expansion depth: 9/100 Expensive parser function count: 5/500 Unstrip recursion depth: 0/20 Unstrip post‐expand size: 23426/5000000 bytes Lua time usage: 0.163/10.000 seconds Lua memory usage: 2028438/52428800 bytes Number of Wikibase entities loaded: 0/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 303.514 1 -total 100.00% 303.514 1 Template:WikiProject_banner_shell 44.90% 136.292 1 Template:WikiProject_Rowing 3.78% 11.471 1 Template:WikiProject_Canoeing_and_Kayaking 3.42% 10.389 1 Template:WikiProject_Ships 1.76% 5.335 2 Template:Tl 0.53% 1.605 4 Template:Nowrap --> <!-- Saved in parser cache with key enwiki:pcache:idhash:13760-0!canonical and timestamp 20241125033831 and revision id 1228466878. 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