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class="vector-toc-numb">2</span> <span>Modern equivalents</span> </div> </a> <button aria-controls="toc-Modern_equivalents-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Modern equivalents subsection</span> </button> <ul id="toc-Modern_equivalents-sublist" class="vector-toc-list"> <li id="toc-Versions" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Versions"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Versions</span> </div> </a> <ul id="toc-Versions-sublist" class="vector-toc-list"> <li id="toc-Logging_arch" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Logging_arch"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.1</span> <span>Logging arch</span> </div> </a> <ul id="toc-Logging_arch-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Cable_skidders" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Cable_skidders"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.2</span> <span>Cable skidders</span> </div> </a> <ul id="toc-Cable_skidders-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Grapple_skidders" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Grapple_skidders"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.3</span> <span>Grapple skidders</span> </div> </a> <ul id="toc-Grapple_skidders-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" 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<div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Type of heavy vehicle used in logging operations to pull cut trees out of a forest</div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-No_footnotes plainlinks metadata ambox ambox-style ambox-No_footnotes" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/40px-Text_document_with_red_question_mark.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/60px-Text_document_with_red_question_mark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Text_document_with_red_question_mark.svg/80px-Text_document_with_red_question_mark.svg.png 2x" data-file-width="48" data-file-height="48" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article includes a <a href="/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources">list of references</a>, <a href="/wiki/Wikipedia:Further_reading" title="Wikipedia:Further reading">related reading</a>, or <a href="/wiki/Wikipedia:External_links" title="Wikipedia:External links">external links</a>, <b>but its sources remain unclear because it lacks <a href="/wiki/Wikipedia:Citing_sources#Inline_citations" title="Wikipedia:Citing sources">inline citations</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Wikipedia:WikiProject_Fact_and_Reference_Check" class="mw-redirect" title="Wikipedia:WikiProject Fact and Reference Check">improve</a> this article by <a href="/wiki/Wikipedia:When_to_cite" title="Wikipedia:When to cite">introducing</a> more precise citations.</span> <span class="date-container"><i>(<span class="date">April 2010</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Old_log_skidder.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Old_log_skidder.jpg/220px-Old_log_skidder.jpg" decoding="async" width="220" height="144" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Old_log_skidder.jpg/330px-Old_log_skidder.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f5/Old_log_skidder.jpg/440px-Old_log_skidder.jpg 2x" data-file-width="1600" data-file-height="1045" /></a><figcaption>A slip tongue log skidder used in the 19th and early 20th centuries</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Skidding_harness_diagram.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Skidding_harness_diagram.png/220px-Skidding_harness_diagram.png" decoding="async" width="220" height="258" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Skidding_harness_diagram.png/330px-Skidding_harness_diagram.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Skidding_harness_diagram.png/440px-Skidding_harness_diagram.png 2x" data-file-width="2824" data-file-height="3317" /></a><figcaption>Elements of a skidding harness</figcaption></figure> <p>A <b>skidder</b> is any type of <a href="/wiki/Heavy_vehicle" class="mw-redirect" title="Heavy vehicle">heavy vehicle</a> used in a <a href="/wiki/Logging" title="Logging">logging</a> operation for pulling cut <a href="/wiki/Timber" class="mw-redirect" title="Timber">trees</a> out of a forest in a process called "skidding", in which the logs are transported from the cutting site to a landing. There they are loaded onto trucks (or in times past, railroad cars or <a href="/wiki/Flume" title="Flume">flumes</a>), and sent to the mill. One exception is that in the early days of logging, when distances from the timberline to the mill were shorter, the landing stage was omitted altogether, and the "skidder" would have been used as the main road vehicle, in place of the trucks, railroad, or flume. Modern forms of skidders can pull trees with a <a href="/wiki/Wire_rope" title="Wire rope">cable</a> and <a href="/wiki/Winch" title="Winch">winch</a> (<i>cable skidder</i>), just like the old <a href="/wiki/Steam_donkey" title="Steam donkey">steam donkeys</a>, or with a hydraulic <a href="/wiki/Grapple_(tool)" title="Grapple (tool)">grapple</a> either on <a href="/wiki/Crane_(machine)" title="Crane (machine)">boom</a> (<i>grapple skidder</i>) or on the back of the frame <i>(clambunk skidder)</i>.<sup class="noprint Inline-Template" style="margin-left:0.1em; white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Please_clarify" title="Wikipedia:Please clarify"><span title="The text near this tag may need clarification or removal of jargon. (November 2018)">clarification needed</span></a></i>]</sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skidder&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Hauling.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Hauling.gif/220px-Hauling.gif" decoding="async" width="220" height="179" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Hauling.gif/330px-Hauling.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Hauling.gif/440px-Hauling.gif 2x" data-file-width="480" data-file-height="390" /></a><figcaption>Horse skidder with high wheels</figcaption></figure> <p>Early skidders were pulled by a team of <a href="/wiki/Oxen" class="mw-redirect" title="Oxen">oxen</a>, <a href="/wiki/Horse" title="Horse">horses</a> or <a href="/wiki/Mule" title="Mule">mules</a>. The driver would straddle the cart over felled logs, where dangling tongs would be positioned to raise the end of the log off the ground. The team pulled the tongue forward, allowing the log to "skid" along between the rolling wheels. These were known as "slip-tongue wheels" Starting in the early 1920s, animals were gradually replaced by <a href="/wiki/Gasoline" title="Gasoline">gasoline</a>-powered crawlers, although some small operations continue to use horses. In other places, steel "arches" were used behind the crawlers. Similar in function to the slip-tongue wheels, arches were used to reduce friction by raising up one end of the load, which was dangled from a cable which in turn ran down the back of the arch, and was raised or lowered by the crawler's winch. Another piece similar to the arch was the "bummer", which was simply a small trailer to be towed behind a crawler, on top of which one end of the log load would rest. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Marathon_Skidder.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Marathon_Skidder.jpg/220px-Marathon_Skidder.jpg" decoding="async" width="220" height="242" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Marathon_Skidder.jpg/330px-Marathon_Skidder.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Marathon_Skidder.jpg/440px-Marathon_Skidder.jpg 2x" data-file-width="1177" data-file-height="1297" /></a><figcaption>Clyde Skidder at Marathon Logging Camp ~1921</figcaption></figure> <p>The early mechanical skidders were steam powered. They traveled on railroads, known as "dummylines" and the felled trees were dragged or "skidded" to the railroad where they were later loaded onto rail cars. Some, such as the <a href="/wiki/Steam_donkey" title="Steam donkey">steam donkeys</a>, were relatively simple but other mechanical skidders were more complex. The largest of these mechanical skidders was the <a href="/wiki/Lidgerwood" title="Lidgerwood">Lidgerwood</a> skidder, which not only brought logs to the landing from the cutting site, but loaded them onto railroad cars as well, making it both a skidder and loader. One popular brand was the Clyde Skidder, built by Clyde Ironworks in <a href="/wiki/Duluth,_Minnesota" title="Duluth, Minnesota">Duluth, Minnesota</a>.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="no source validating the claim of the Clyde Skidder's popularity (June 2023)">citation needed</span></a></i>]</sup> The Clyde was capable of retrieving logs from four different points at the same time. Each cable, or lead, was approximately 1,000 feet (300 m) in length. Once the logs were attached and a clearance signal was sent for retrieval, they could be skidded at a speed of 1,000 feet per minute (18 km/h). In New Zealand cables were run five miles.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (June 2023)">citation needed</span></a></i>]</sup> Working conditions around these machines were very dangerous.<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:AUDIENCE" class="mw-redirect" title="Wikipedia:AUDIENCE"><span title="An editor has requested that an example be provided. (June 2023)">example needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading2"><h2 id="Modern_equivalents">Modern equivalents</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skidder&action=edit&section=2" title="Edit section: Modern equivalents"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Brazil_skidding_-_50376871621.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Brazil_skidding_-_50376871621.jpg/220px-Brazil_skidding_-_50376871621.jpg" decoding="async" width="220" height="164" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Brazil_skidding_-_50376871621.jpg/330px-Brazil_skidding_-_50376871621.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Brazil_skidding_-_50376871621.jpg/440px-Brazil_skidding_-_50376871621.jpg 2x" data-file-width="2254" data-file-height="1684" /></a><figcaption>Manual skidding in Brazil, 2008</figcaption></figure> <p>Contemporary skidders are <a href="/wiki/Caterpillar_track" class="mw-redirect" title="Caterpillar track">tracked</a> or <a href="/wiki/Four_wheel_drive" class="mw-redirect" title="Four wheel drive">four wheel drive</a> <a href="/wiki/Tractor" title="Tractor">tractors</a> with a <a href="/wiki/Diesel_engine" title="Diesel engine">diesel engine</a>, <a href="/wiki/Winch" title="Winch">winch</a> and <a href="/wiki/Steel" title="Steel">steel</a>, funnel-shaped guards on the rear to protect their wheels. They have <a href="/wiki/Steering#Articulated_steering" title="Steering">articulated steering</a> and usually a small, adjustable, push-blade on the front. The operator/<a href="/wiki/Lumberjack" title="Lumberjack">logger</a> is protected from falling or flying debris (or parted cables, or rolling over) by a steel enclosure. They are one of the few logging machines that is capable of thinning or selective logging in larger timber.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (June 2023)">citation needed</span></a></i>]</sup> Forwarders can haul small short pieces out, however a skidder is one of the few options for taking out some trees while leaving others when thinning mature lumber. </p><p>The skidder can also be used for pulling tree stumps, pushing over small trees, and preliminary grading of a logging path known as a "<a href="/wiki/Skid_row" title="Skid row">skid road</a>". </p><p>While wood is being yarded (pulled) by the skidder, tree particles and seeds are cultivated into the soil.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (June 2023)">citation needed</span></a></i>]</sup> </p><p>Skidder logging can be disadvantageous in thinning operations due to the damage caused to remaining trees as branches and trunks are dragged against them, tearing away the protective bark of living trees. Another ecological concern is the deep furrows in the <a href="/wiki/Topsoil" title="Topsoil">topsoil</a> sometimes made by skidders, especially when using tires with chains, which alter <a href="/wiki/Surface_runoff" title="Surface runoff">surface runoff</a> patterns and increases the costs of forest rehabilitation and <a href="/wiki/Reforestation" title="Reforestation">reforestation</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Versions">Versions</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skidder&action=edit&section=3" title="Edit section: Versions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading4"><h4 id="Logging_arch">Logging arch</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skidder&action=edit&section=4" title="Edit section: Logging arch"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Kauri_Museum,_Logging_Arch_.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Kauri_Museum%2C_Logging_Arch_.jpg/150px-Kauri_Museum%2C_Logging_Arch_.jpg" decoding="async" width="150" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Kauri_Museum%2C_Logging_Arch_.jpg/225px-Kauri_Museum%2C_Logging_Arch_.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Kauri_Museum%2C_Logging_Arch_.jpg/300px-Kauri_Museum%2C_Logging_Arch_.jpg 2x" data-file-width="3168" data-file-height="4752" /></a><figcaption>Logging arch on display at <a href="/wiki/Kauri_Museum" title="Kauri Museum">Kauri Museum</a> in New Zealand</figcaption></figure> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-Expand_section plainlinks metadata ambox mbox-small-left ambox-content" role="presentation"><tbody><tr><td class="mbox-image"><span typeof="mw:File"><a href="/wiki/File:Wiki_letter_w_cropped.svg" class="mw-file-description"><img alt="[icon]" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/20px-Wiki_letter_w_cropped.svg.png" decoding="async" width="20" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/30px-Wiki_letter_w_cropped.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/40px-Wiki_letter_w_cropped.svg.png 2x" data-file-width="44" data-file-height="31" /></a></span></td><td class="mbox-text"><div class="mbox-text-span">This section <b>needs expansion</b>. You can help by <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Skidder&action=edit&section=">adding to it</a>. <span class="date-container"><i>(<span class="date">April 2021</span>)</i></span></div></td></tr></tbody></table> <p>A device similar to a skip tongue log skidder except that it is made of <a href="/wiki/Steel" title="Steel">steel</a>, including the <a href="/wiki/Spoke" title="Spoke">spoked</a> <a href="/wiki/Wheel" title="Wheel">wheels</a> </p> <div class="mw-heading mw-heading4"><h4 id="Cable_skidders">Cable skidders</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skidder&action=edit&section=5" title="Edit section: Cable skidders"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Skidder528.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/88/Skidder528.jpg/220px-Skidder528.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/88/Skidder528.jpg/330px-Skidder528.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/88/Skidder528.jpg/440px-Skidder528.jpg 2x" data-file-width="1280" data-file-height="960" /></a><figcaption> Caterpillar 528 cable skidder in <a href="/wiki/Apiary,_Oregon" title="Apiary, Oregon">Apiary, Oregon</a></figcaption></figure> <p>On a cable skidder, the cable is reeled out and attached to a pull of cut timber, then the winch pulls the load toward the skidder. The winch or grapple holds the trees while the skidder drags them to a landing area. Cable skidders are more labor-intensive than grapple skidders because someone (the operator or a second person) must drag the winch line out to the logs and hook them up manually. Nowadays, cable skidders are less popular than in the past.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (June 2023)">citation needed</span></a></i>]</sup> These machines are most useful in areas where it is not possible to drive the machine close to the log (such as in steep hills). </p> <div class="mw-heading mw-heading4"><h4 id="Grapple_skidders">Grapple skidders</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skidder&action=edit&section=6" title="Edit section: Grapple skidders"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Skidderdualfunction.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/55/Skidderdualfunction.jpg/220px-Skidderdualfunction.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/55/Skidderdualfunction.jpg/330px-Skidderdualfunction.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/55/Skidderdualfunction.jpg/440px-Skidderdualfunction.jpg 2x" data-file-width="3008" data-file-height="2008" /></a><figcaption>Modern dual function grapple skidder</figcaption></figure> <p>Grapple skidders use a loader crane boom with a <a href="/wiki/Hydraulic_machinery" title="Hydraulic machinery">hydraulic</a> <a href="/wiki/Grapple_(tool)" title="Grapple (tool)">grapple</a> bucket to grab and lift the timber. </p><p>There are three types of 'fixed boom' grapple skidders. A single-function boom type has two hydraulic cylinders, only allowing the boom to lower in one position. Dual-function booms (as pictured) have four cylinders, which allows for adjusting the boom in two different places. The third type permits the grapple boom to be swung from side to side, allowing spread out trees to be grabbed at once. </p><p>In some areas, loggers have combined a hydraulic claw on the side with the blade of their grapple skidders, making it possible to pile logs in some cases. More common on cable skidders, this also permits hauling back bark and tops when returning from a landing area to fallen timber. </p><p><b>Clambunk skidders</b> </p><p>Clambunk skidders are more of a middle ground between skidder and a <a href="/wiki/Forwarder" title="Forwarder">forwarder</a>. They have large free swiveling hydraulic jaws positioned on the back of the chassis that clamp the logs. They usually don't have self-loading capability and require <a href="/wiki/Feller_buncher" title="Feller buncher">feller buncher</a> or other machine with loader arm. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skidder&action=edit&section=7" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Feller_buncher" title="Feller buncher">Feller buncher</a></li> <li><a href="/wiki/Forwarder" title="Forwarder">Forwarder</a></li> <li><a href="/wiki/Harvester_(forestry)" title="Harvester (forestry)">Harvester</a></li> <li><a href="/w/index.php?title=Michigan_logging_wheels&action=edit&redlink=1" class="new" title="Michigan logging wheels (page does not exist)">Michigan logging wheels</a></li> <li><a href="/wiki/Skidding_(forestry)" title="Skidding (forestry)">Skidding (forestry)</a></li> <li><a href="/wiki/Washington_Iron_Works_Skidder" class="mw-redirect" title="Washington Iron Works Skidder">Washington Iron Works Skidder</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Skidder&action=edit&section=8" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Commons-logo.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/12px-Commons-logo.svg.png" decoding="async" width="12" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/24px-Commons-logo.svg.png 2x" data-file-width="1024" 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.navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Forestry_tools" title="Template:Forestry tools"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Forestry_tools" title="Template talk:Forestry tools"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Forestry_tools" title="Special:EditPage/Template:Forestry tools"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Forestry_tools_and_equipment" style="font-size:114%;margin:0 4em"><a href="/wiki/Forestry" title="Forestry">Forestry</a> <a href="/wiki/Tool" title="Tool">tools</a> and <a href="/wiki/Heavy_equipment" title="Heavy equipment">equipment</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Tree_planting" title="Tree planting">Tree planting</a>,<br /><a href="/wiki/Afforestation" title="Afforestation">afforestation</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Caulk_boots" title="Caulk boots">Caulk boots</a></li> <li><a href="/wiki/Hoe_(tool)#Types" title="Hoe (tool)">Hoedad</a> (hoedag)</li> <li><a href="/wiki/Groasis_Waterboxx" title="Groasis Waterboxx">Groasis Waterboxx</a></li> <li><a href="/wiki/Mattock" title="Mattock">Mattock</a></li> <li><a href="/wiki/Pottiputki" title="Pottiputki">Pottiputki</a></li> <li><a href="/wiki/Root_trainer" title="Root trainer">Root trainer</a></li> <li><a href="/wiki/Seed_trap" title="Seed trap">Seed trap</a></li> <li><a href="/wiki/Tree_planting_bar" title="Tree planting bar">Tree planting bar</a> (dibble bar)</li> <li><a href="/wiki/Tree_shelter" title="Tree shelter">Tree shelter</a> (Tuley tube)</li> <li><a href="/wiki/Tree_spade" title="Tree spade">Tree spade</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="7" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:Using_a_DTApe.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Using_a_DTApe.JPG/70px-Using_a_DTApe.JPG" decoding="async" width="70" height="93" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Using_a_DTApe.JPG/105px-Using_a_DTApe.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Using_a_DTApe.JPG/140px-Using_a_DTApe.JPG 2x" data-file-width="1536" data-file-height="2048" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Tree_measurement" title="Tree measurement">Mensuration</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/3D_scanning" title="3D scanning">3D scanner</a></li> <li><a href="/wiki/Angle_gauge" title="Angle gauge">Angle gauge</a></li> <li><a href="/wiki/Biltmore_stick" title="Biltmore stick">Biltmore stick</a></li> <li><a href="/wiki/Chain_(unit)#Other_instruments" title="Chain (unit)">Chain</a></li> <li><a href="/wiki/Cruising_rod" title="Cruising rod">Cruising rod</a></li> <li><a href="/wiki/Diameter_tape" title="Diameter tape">Diameter tape</a></li> <li><a href="/wiki/Hemispherical_photography" title="Hemispherical photography">Hemispherical photography</a></li> <li><a href="/wiki/Inclinometer" title="Inclinometer">Inclinometer</a></li> <li><a href="/wiki/Increment_borer" title="Increment borer">Increment borer</a></li> <li><a href="/wiki/Rangefinding_telemeter" class="mw-redirect" title="Rangefinding telemeter">Rangefinder</a> <ul><li><a href="/wiki/Laser_rangefinder" title="Laser rangefinder">laser</a></li></ul></li> <li><a href="/wiki/Microtome" title="Microtome">Microtome</a></li> <li><a href="/wiki/Relascope" title="Relascope">Relascope</a></li> <li><a href="/wiki/Tree_caliper" title="Tree caliper">Tree caliper</a></li> <li><a href="/wiki/Wedge_prism" title="Wedge prism">Wedge prism</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Wildfire_suppression_equipment_and_personnel" title="Wildfire suppression equipment and personnel">Fire suppression</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aerial_firefighting" title="Aerial firefighting">Aerial firefighting</a> <ul><li><a href="/wiki/DC-10_Air_Tanker" title="DC-10 Air Tanker">DC-10</a></li> <li><a href="/wiki/Unmanned_aerial_vehicle#Forest_fire_detection" title="Unmanned aerial vehicle">UAVs</a></li></ul></li> <li><a href="/wiki/Driptorch" title="Driptorch">Driptorch</a></li> <li><a href="/wiki/Fire_flapper_(tool)" class="mw-redirect" title="Fire flapper (tool)">Fire flapper</a></li> <li><a href="/wiki/Fire_rake" title="Fire rake">Fire rake</a></li> <li><a href="/wiki/Fire_retardant#Forest-fire_fighting" title="Fire retardant">Fire retardant</a></li> <li><a href="/wiki/Helitack" title="Helitack">Helitack</a></li> <li><a href="/wiki/McLeod_(tool)" title="McLeod (tool)">McLeod</a> (rakehoe)</li> <li><a href="/wiki/Pulaski_(tool)" title="Pulaski (tool)">Pulaski</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Axe" title="Axe">Axes</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Billhook" title="Billhook">Billhook</a></li> <li><a href="/wiki/Broadaxe" title="Broadaxe">Broadaxe</a></li> <li><a href="/wiki/Brush_hook" class="mw-redirect" title="Brush hook">Brush hook</a></li> <li><a href="/wiki/Froe" title="Froe">Froe</a> (shake axe)</li> <li><a href="/wiki/Hatchet" title="Hatchet">Hatchet</a></li> <li><a href="/wiki/Labrys" title="Labrys">Labrys</a></li> <li><a href="/wiki/Log_splitter" title="Log splitter">Log splitter</a></li> <li><a href="/wiki/Marking_axe" title="Marking axe">Marking axe</a></li> <li><a href="/wiki/Splitting_maul" title="Splitting maul">Splitting maul</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Saw" title="Saw">Saws</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bow_saw" title="Bow saw">Bow saw</a></li> <li><a href="/wiki/Bucksaw" title="Bucksaw">Bucksaw</a></li> <li><a href="/wiki/Chainsaw" title="Chainsaw">Chainsaw</a> <ul><li><a href="/wiki/Chainsaw_safety_clothing" title="Chainsaw safety clothing">safety clothing</a></li> <li><a href="/wiki/Chainsaw_safety_features" title="Chainsaw safety features">safety features</a></li></ul></li> <li><a href="/wiki/Crosscut_saw" title="Crosscut saw">Crosscut saw</a></li> <li><a href="/wiki/Dragsaw" title="Dragsaw">Dragsaw</a></li> <li><a href="/wiki/Head_saw" title="Head saw">Head saw</a></li> <li><a href="/wiki/Lumber_edger" title="Lumber edger">Lumber edger</a></li> <li><a href="/wiki/Polesaw" title="Polesaw">Polesaw</a></li> <li><a href="/wiki/Portable_sawmill" title="Portable sawmill">Portable sawmill</a></li> <li><a href="/wiki/Resaw" title="Resaw">Resaw</a></li> <li><a href="/wiki/Two-man_saw" title="Two-man saw">Two-man saw</a></li> <li><a href="/wiki/Whipsaw" title="Whipsaw">Whipsaw</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Logging" title="Logging">Logging</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cant_hook" title="Cant hook">Cant hook</a></li> <li><a href="/wiki/Feller_buncher" title="Feller buncher">Feller buncher</a></li> <li><a href="/wiki/Forwarder" title="Forwarder">Forwarder</a></li> <li><a href="/wiki/Go-devil" title="Go-devil">Go-devil</a></li> <li><a href="/wiki/Harvester_(forestry)" title="Harvester (forestry)">Harvester</a></li> <li><a href="/wiki/Heli-logging" title="Heli-logging">Helicopter</a></li> <li><a href="/wiki/Logging_truck" title="Logging truck">Log truck</a></li> <li><a href="/wiki/Lombard_Steam_Log_Hauler" title="Lombard Steam Log Hauler">Lombard Steam Log Hauler</a></li> <li><a href="/wiki/Peavey_(tool)" class="mw-redirect" title="Peavey (tool)">Peavey</a></li> <li><a href="/wiki/Pickaroon" title="Pickaroon">Pickaroon</a></li> <li><a href="/wiki/Pike_pole" title="Pike pole">Pike pole</a></li> <li><a href="/wiki/Skid_cone" title="Skid cone">Skid cone</a></li> <li><a class="mw-selflink selflink">Skidder</a> <ul><li><a href="/wiki/Washington_Winch" title="Washington Winch">Washington Winch</a></li></ul></li> <li><a href="/wiki/Steam_donkey" title="Steam donkey">Steam donkey</a></li> <li><a href="/wiki/Yarder" title="Yarder">Yarder</a> <ul><li><a href="/wiki/Swing_yarder" title="Swing yarder">swing</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Denailer" title="Denailer">Denailer</a></li> <li><a href="/wiki/Firewood_processor" title="Firewood processor">Firewood processor</a></li> <li><a href="/wiki/Forest_railway" title="Forest railway">Forest railway</a></li> <li><a href="/wiki/Forestry_mulching" title="Forestry mulching">Forestry mulcher</a></li> <li><a href="/wiki/Hand_compass" title="Hand compass">Hand compass</a></li> <li><a href="/wiki/Hook_(hand_tool)#Forestry_hook" title="Hook (hand tool)">Hand hook</a></li> <li><a href="/wiki/Hydraulic_debarker" title="Hydraulic debarker">Hydraulic debarker</a></li> <li><a href="/wiki/Log_house_moulder" title="Log house moulder">Log house moulder</a></li> <li><a href="/wiki/Log_pond" title="Log pond">Log pond</a></li> <li><a href="/wiki/Log_flume" title="Log flume">Log flume</a></li> <li><a href="/wiki/Machete" title="Machete">Machete</a></li> <li><a href="/wiki/Stump_grinder" title="Stump grinder">Stump grinder</a></li> <li><a href="/wiki/Chainsaw_mill" title="Chainsaw mill">Chainsaw mill</a></li> <li><a href="/wiki/Tree_baler" title="Tree baler">Tree tyer</a></li> <li><a href="/wiki/Tsakat" class="mw-redirect" title="Tsakat">Tsakat</a></li> <li><a href="/wiki/Whoopie_sling" title="Whoopie sling">Whoopie sling</a></li> <li><a href="/wiki/Kiln#Wood-drying_kiln" title="Kiln">Wood-drying kiln</a></li> <li><a href="/wiki/Woodchipper" title="Woodchipper">Woodchipper</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" 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tools">Cleaning</a></dd> <dd><a href="/wiki/Template:Cutting_and_abrasive_tools" title="Template:Cutting and abrasive tools">Cutting and abrasive</a></dd> <dd><a href="/wiki/Template:Forestry_tools" title="Template:Forestry tools">Forestry</a></dd> <dd><a href="/wiki/Template:Garden_tools" title="Template:Garden tools">Garden</a></dd> <dd><a href="/wiki/Template:Hand_tools" title="Template:Hand tools">Hand</a></dd> <dd><a href="/wiki/Template:Kitchen_tools" title="Template:Kitchen tools">Kitchen</a></dd> <dd><a href="/wiki/Template:Machine_and_metalworking_tools" title="Template:Machine and metalworking tools">Machine and metalworking</a></dd> <dd><a href="/wiki/Template:Masonry_tools" title="Template:Masonry tools">Masonry</a></dd> <dd><a href="/wiki/Template:Measuring_and_alignment_tools" title="Template:Measuring and alignment tools">Measuring and alignment</a></dd> <dd><a href="/wiki/Template:Mining_equipment" title="Template:Mining equipment">Mining</a></dd> <dd><a 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