CINXE.COM

Michael Selig

<!doctype html> <html class="no-js" lang="en" data-content_root=""> <head><meta charset="utf-8"/> <meta name="viewport" content="width=device-width,initial-scale=1"/> <meta name="color-scheme" content="light dark"><meta name="viewport" content="width=device-width, initial-scale=1" /> <meta content="Dr Michael Selig, Professor Emeritus of Aerospace Engineering at UIUC. Expert in aerodynamics, airfoil design, flight simulation and modeling." name="description" /> <link rel="index" title="Index" href="genindex.html" /><link rel="search" title="Search" href="search.html" /><link rel="next" title="YouTube" href="youtube.html" /> <link rel="shortcut icon" href="_static/favicon.ico"/><!-- Generated with Sphinx 7.1.2 and Furo 2024.08.06 --> <title>Michael Selig</title> <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=a746c00c" /> <link rel="stylesheet" type="text/css" href="_static/styles/furo.css?v=354aac6f" /> <link rel="stylesheet" type="text/css" href="_static/styles/furo-extensions.css?v=302659d7" /> <style> body { --color-code-background: #f8f8f8; --color-code-foreground: black; --color-background-border: SlateGrey; } @media not print { body[data-theme="dark"] { --color-code-background: #202020; --color-code-foreground: #d0d0d0; } @media (prefers-color-scheme: dark) { body:not([data-theme="light"]) { --color-code-background: #202020; --color-code-foreground: #d0d0d0; } } } </style></head> <body> <script> document.body.dataset.theme = localStorage.getItem("theme") || "auto"; </script> <svg xmlns="http://www.w3.org/2000/svg" style="display: none;"> <symbol id="svg-toc" viewBox="0 0 24 24"> <title>Contents</title> <svg stroke="currentColor" fill="currentColor" stroke-width="0" viewBox="0 0 1024 1024"> <path d="M408 442h480c4.4 0 8-3.6 8-8v-56c0-4.4-3.6-8-8-8H408c-4.4 0-8 3.6-8 8v56c0 4.4 3.6 8 8 8zm-8 204c0 4.4 3.6 8 8 8h480c4.4 0 8-3.6 8-8v-56c0-4.4-3.6-8-8-8H408c-4.4 0-8 3.6-8 8v56zm504-486H120c-4.4 0-8 3.6-8 8v56c0 4.4 3.6 8 8 8h784c4.4 0 8-3.6 8-8v-56c0-4.4-3.6-8-8-8zm0 632H120c-4.4 0-8 3.6-8 8v56c0 4.4 3.6 8 8 8h784c4.4 0 8-3.6 8-8v-56c0-4.4-3.6-8-8-8zM115.4 518.9L271.7 642c5.8 4.6 14.4.5 14.4-6.9V388.9c0-7.4-8.5-11.5-14.4-6.9L115.4 505.1a8.74 8.74 0 0 0 0 13.8z"/> </svg> </symbol> <symbol id="svg-menu" viewBox="0 0 24 24"> <title>Menu</title> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather-menu"> <line x1="3" y1="12" x2="21" y2="12"></line> <line x1="3" y1="6" x2="21" y2="6"></line> <line x1="3" y1="18" x2="21" y2="18"></line> </svg> </symbol> <symbol id="svg-arrow-right" viewBox="0 0 24 24"> <title>Expand</title> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather-chevron-right"> <polyline points="9 18 15 12 9 6"></polyline> </svg> </symbol> <symbol id="svg-sun" viewBox="0 0 24 24"> <title>Light mode</title> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round" class="feather-sun"> <circle cx="12" cy="12" r="5"></circle> <line x1="12" y1="1" x2="12" y2="3"></line> <line x1="12" y1="21" x2="12" y2="23"></line> <line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line> <line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line> <line x1="1" y1="12" x2="3" y2="12"></line> <line x1="21" y1="12" x2="23" y2="12"></line> <line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line> <line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line> </svg> </symbol> <symbol id="svg-moon" viewBox="0 0 24 24"> <title>Dark mode</title> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round" class="icon-tabler-moon"> <path stroke="none" d="M0 0h24v24H0z" fill="none" /> <path d="M12 3c.132 0 .263 0 .393 0a7.5 7.5 0 0 0 7.92 12.446a9 9 0 1 1 -8.313 -12.454z" /> </svg> </symbol> <symbol id="svg-sun-with-moon" viewBox="0 0 24 24"> <title>Auto light/dark, in light mode</title> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round" class="icon-custom-derived-from-feather-sun-and-tabler-moon"> <path style="opacity: 50%" d="M 5.411 14.504 C 5.471 14.504 5.532 14.504 5.591 14.504 C 3.639 16.319 4.383 19.569 6.931 20.352 C 7.693 20.586 8.512 20.551 9.25 20.252 C 8.023 23.207 4.056 23.725 2.11 21.184 C 0.166 18.642 1.702 14.949 4.874 14.536 C 5.051 14.512 5.231 14.5 5.411 14.5 L 5.411 14.504 Z"/> <line x1="14.5" y1="3.25" x2="14.5" y2="1.25"/> <line x1="14.5" y1="15.85" x2="14.5" y2="17.85"/> <line x1="10.044" y1="5.094" x2="8.63" y2="3.68"/> <line x1="19" y1="14.05" x2="20.414" y2="15.464"/> <line x1="8.2" y1="9.55" x2="6.2" y2="9.55"/> <line x1="20.8" y1="9.55" x2="22.8" y2="9.55"/> <line x1="10.044" y1="14.006" x2="8.63" y2="15.42"/> <line x1="19" y1="5.05" x2="20.414" y2="3.636"/> <circle cx="14.5" cy="9.55" r="3.6"/> </svg> </symbol> <symbol id="svg-moon-with-sun" viewBox="0 0 24 24"> <title>Auto light/dark, in dark mode</title> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round" class="icon-custom-derived-from-feather-sun-and-tabler-moon"> <path d="M 8.282 7.007 C 8.385 7.007 8.494 7.007 8.595 7.007 C 5.18 10.184 6.481 15.869 10.942 17.24 C 12.275 17.648 13.706 17.589 15 17.066 C 12.851 22.236 5.91 23.143 2.505 18.696 C -0.897 14.249 1.791 7.786 7.342 7.063 C 7.652 7.021 7.965 7 8.282 7 L 8.282 7.007 Z"/> <line style="opacity: 50%" x1="18" y1="3.705" x2="18" y2="2.5"/> <line style="opacity: 50%" x1="18" y1="11.295" x2="18" y2="12.5"/> <line style="opacity: 50%" x1="15.316" y1="4.816" x2="14.464" y2="3.964"/> <line style="opacity: 50%" x1="20.711" y1="10.212" x2="21.563" y2="11.063"/> <line style="opacity: 50%" x1="14.205" y1="7.5" x2="13.001" y2="7.5"/> <line style="opacity: 50%" x1="21.795" y1="7.5" x2="23" y2="7.5"/> <line style="opacity: 50%" x1="15.316" y1="10.184" x2="14.464" y2="11.036"/> <line style="opacity: 50%" x1="20.711" y1="4.789" x2="21.563" y2="3.937"/> <circle style="opacity: 50%" cx="18" cy="7.5" r="2.169"/> </svg> </symbol> <symbol id="svg-pencil" viewBox="0 0 24 24"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round" class="icon-tabler-pencil-code"> <path d="M4 20h4l10.5 -10.5a2.828 2.828 0 1 0 -4 -4l-10.5 10.5v4" /> <path d="M13.5 6.5l4 4" /> <path d="M20 21l2 -2l-2 -2" /> <path d="M17 17l-2 2l2 2" /> </svg> </symbol> <symbol id="svg-eye" viewBox="0 0 24 24"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1" stroke-linecap="round" stroke-linejoin="round" class="icon-tabler-eye-code"> <path stroke="none" d="M0 0h24v24H0z" fill="none" /> <path d="M10 12a2 2 0 1 0 4 0a2 2 0 0 0 -4 0" /> <path d="M11.11 17.958c-3.209 -.307 -5.91 -2.293 -8.11 -5.958c2.4 -4 5.4 -6 9 -6c3.6 0 6.6 2 9 6c-.21 .352 -.427 .688 -.647 1.008" /> <path d="M20 21l2 -2l-2 -2" /> <path d="M17 17l-2 2l2 2" /> </svg> </symbol> </svg> <input type="checkbox" class="sidebar-toggle" name="__navigation" id="__navigation"> <input type="checkbox" class="sidebar-toggle" name="__toc" id="__toc"> <label class="overlay sidebar-overlay" for="__navigation"> <div class="visually-hidden">Hide navigation sidebar</div> </label> <label class="overlay toc-overlay" for="__toc"> <div class="visually-hidden">Hide table of contents sidebar</div> </label> <a class="skip-to-content muted-link" href="#furo-main-content">Skip to content</a> <div class="page"> <header class="mobile-header"> <div class="header-left"> <label class="nav-overlay-icon" for="__navigation"> <div class="visually-hidden">Toggle site navigation sidebar</div> <i class="icon"><svg><use href="#svg-menu"></use></svg></i> </label> </div> <div class="header-center"> <a href="#"><div class="brand">Michael Selig</div></a> </div> <div class="header-right"> <div class="theme-toggle-container theme-toggle-header"> <button class="theme-toggle"> <div class="visually-hidden">Toggle Light / Dark / Auto color theme</div> <svg class="theme-icon-when-auto-light"><use href="#svg-sun-with-moon"></use></svg> <svg class="theme-icon-when-auto-dark"><use href="#svg-moon-with-sun"></use></svg> <svg class="theme-icon-when-dark"><use href="#svg-moon"></use></svg> <svg class="theme-icon-when-light"><use href="#svg-sun"></use></svg> </button> </div> <label class="toc-overlay-icon toc-header-icon" for="__toc"> <div class="visually-hidden">Toggle table of contents sidebar</div> <i class="icon"><svg><use href="#svg-toc"></use></svg></i> </label> </div> </header> <aside class="sidebar-drawer"> <div class="sidebar-container"> <div class="sidebar-sticky"><a class="sidebar-brand" href="#"> <div class="sidebar-logo-container"> <img class="sidebar-logo only-light" src="_static/michaelselig-circle-crop-II-smaller-blur.png" alt="Light Logo"/> <img class="sidebar-logo only-dark" src="_static/michaelselig-circle-crop-II-smaller-blur.png" alt="Dark Logo"/> </div> <span class="sidebar-brand-text">Michael Selig</span> </a><form class="sidebar-search-container" method="get" action="search.html" role="search"> <input class="sidebar-search" placeholder="Search" name="q" aria-label="Search"> <input type="hidden" name="check_keywords" value="yes"> <input type="hidden" name="area" value="default"> </form> <div id="searchbox"></div><div class="sidebar-scroll"><div class="sidebar-tree"> <ul class="current"> <li class="toctree-l1 current current-page"><a class="current reference internal" href="#">Home</a></li> <li class="toctree-l1"><a class="reference internal" href="youtube.html">YouTube</a></li> <li class="toctree-l1"><a class="reference internal" href="facebook.html">Facebook</a></li> <li class="toctree-l1"><a class="reference internal" href="rcgroups.html">RC Groups (Model Aviation)</a></li> <li class="toctree-l1"><a class="reference internal" href="uiuc.html">UIUC</a></li> <li class="toctree-l1"><a class="reference internal" href="publications.html">Publications</a></li> </ul> <p class="caption" role="heading"><span class="caption-text">External</span></p> <ul> <li class="toctree-l1"><a class="reference external" href="https://www.seligsim.com">https://www.seligsim.com</a></li> <li class="toctree-l1"><a class="reference external" href="https://www.fsone.com">https://www.fsone.com</a></li> <li class="toctree-l1"><a class="reference external" href="https://michaelselig.substack.com">https://michaelselig.substack.com</a></li> <li class="toctree-l1"><a class="reference external" href="https://m-selig.ae.illinois.edu/">https://m-selig.ae.illinois.edu/</a></li> </ul> </div> </div> </div> </div> </aside> <div class="main"> <div class="content"> <div class="article-container"> <a href="#" class="back-to-top muted-link"> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"> <path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12z"></path> </svg> <span>Back to top</span> </a> <div class="content-icon-container"> <div class="view-this-page"> <a class="muted-link" href="_sources/index.rst.txt" title="View this page"> <svg><use href="#svg-eye"></use></svg> <span class="visually-hidden">View this page</span> </a> </div> <div class="theme-toggle-container theme-toggle-content"> <button class="theme-toggle"> <div class="visually-hidden">Toggle Light / Dark / Auto color theme</div> <svg class="theme-icon-when-auto-light"><use href="#svg-sun-with-moon"></use></svg> <svg class="theme-icon-when-auto-dark"><use href="#svg-moon-with-sun"></use></svg> <svg class="theme-icon-when-dark"><use href="#svg-moon"></use></svg> <svg class="theme-icon-when-light"><use href="#svg-sun"></use></svg> </button> </div> <label class="toc-overlay-icon toc-content-icon" for="__toc"> <div class="visually-hidden">Toggle table of contents sidebar</div> <i class="icon"><svg><use href="#svg-toc"></use></svg></i> </label> </div> <article role="main" id="furo-main-content"> <section id="michael-selig"> <h1>Michael Selig<a class="headerlink" href="#michael-selig" title="Permalink to this heading">¶</a></h1> <blockquote> <div><ul class="simple"> <li><p>Professor Emeritus of Aerospace Engineering at the University of Illinois at Urbana-Champaign <br></p></li> <li><p>President of InertiaSoft, Inc, specializing in realtime flight simulation, developer of SeligSIM</p></li> </ul> </div></blockquote> <p class="rubric">Biography</p> <p>Michael Selig is a Professor Emeritus of Aerospace Engineering at the University of Illinois at Urbana-Champaign (UIUC). He is the President of InertiaSoft, Inc - a software company that specializes in realtime flight dynamics simulation. He has published widely in the areas of low-speed aerodynamics and leads the SeligSIM (FS One) RC flight simulator project.</p> <p>His expertise is in airfoil design, wind energy, low Reynolds number aerodynamics, experimental aerodynamics, wind tunnel testing, and real-time flight simulation, including aircraft icing upset simulation and modeling.</p> <p>He has worked and consulted on the design and aerodynamics of unmanned aerial vehicles/systems, kilowatt through multi-megawatt scale wind turbines, record-breaking high-altitude solar powered aircraft, wing-sail and appendage design for the America’s Cup, front and rear wing designs for IndyCars/CART and Formula 1, and many other areas.</p> <p>He won the AIAA Aerodynamics Award for his research in applied aerodynamics.</p> <p>His codes and methods for airfoil design and wind turbine blade design are used in both the aerospace and wind turbine industries. His airfoil designs and data are available in the open/online literature and used worldwide.</p> <p>His RC flight simulator SeligSIM (FS One) is widely used and one of the most well known RC simulators in model aviation.</p> <p>He has also consulted as an expert witness in aviation litigation. As a consultant, his experience has also been applied to better understand aircraft loss of control in one of the worst aviation accidents in US history.</p> <p>He holds a Ph.D. from Penn State, M.S.E. from Princeton University, and B.S. from the University of Illinois at Urbana-Champaign.</p> <p class="rubric">Overview of the Rest of this Site</p> <p>Below are listed (in first person) many resources that he has made available online, with the first being his most active current project (flight simulation with SeligSIM) and the last being one (airfoil coordinates site) that he started online in 1995 and still runs to this day. The links at left are his points of contact online.</p> <p>Use the list at right to navigate this page.</p> <section id="selig-s-newsletter"> <h2>Selig’s Newsletter<a class="headerlink" href="#selig-s-newsletter" title="Permalink to this heading">¶</a></h2> <blockquote> <div><p>I write a newsletter that discusses flight simulation with SeligSIM (FS One). This includes news about updates and features. I also discuss some of the finer details that go into RC flight simulation, share tips and techniques for flying, and touch on aerodynamics and flight dynamics now and then.</p> </div></blockquote> <center> <p> <iframe src="https://michaelselig.substack.com/embed" width="280" height="220" style="border:1px solid #EEE; background:white;" frameborder="0" scrolling="no"></iframe> </p> </center></section> <section id="seligsim-rc-flight-simulator"> <h2>SeligSIM RC Flight Simulator<a class="headerlink" href="#seligsim-rc-flight-simulator" title="Permalink to this heading">¶</a></h2> <blockquote> <div><p>SeligSIM (also marketed as FS One) is a free RC flight simulator. It has over 140 airplanes and over 35 flying sites. Aerodynamics, ground reactions, and wind/turbulence modeling are its strengths.</p> </div></blockquote> <img alt="Image of airplane model in SeligSIM" class="align-right" src="_images/pawnee-2_350p.png" /> <p><a class="reference external" href="https://www.seligsim.com">SeligSIM</a> is a realtime pilot-in-the-loop RC flight simulator for anyone interested in model aviation at any experience level. It has also been used in research and in the commercial aerospace domain. It specializes in simulating +/-180 deg high angle of attack and high side slip flight, including aerobatics such as upsets, stalls, spins, knife edge flight, etc. The simulator includes power planes and sailplanes ranging from beginner-level trainers to highly advanced model aircraft. It has been used extensively in UAS/UAV development. The simulator is written in the C++ code, and it has been in continuous development since 2003. It was first commercially released in 2006. Find it online at <a class="reference external" href="https://www.seligsim.com">https://www.seligsim.com</a> and <a class="reference external" href="https://www.youtube.com/michaelselig">https://www.youtube.com/michaelselig</a>.</p> <p>Current release: SeligSIM 2024.5 (v18.3)</p> <p>Sign up for the newsletter: <a class="reference external" href="https://michaelselig.substack.com/">https://michaelselig.substack.com/</a></p> </section> <section id="uiuc-low-speed-airfoil-tests"> <h2>UIUC Low-Speed Airfoil Tests<a class="headerlink" href="#uiuc-low-speed-airfoil-tests" title="Permalink to this heading">¶</a></h2> <blockquote> <div><p>Airfoil data for low speed aircraft available online. Over 200 airfoils wind tunnel tested. Useful test data for model aircraft, small UAS, wind turbine, and fan design and analysis, and more.</p> </div></blockquote> <img alt="Image of model airplane" class="align-right" src="_images/supra-sm-2.png" /> <p>Airfoils used on model aircraft and also modern day small UAS often fly at low speeds. The combination of small vehicle size and low speed flight, or slow flight at very high altitudes, results in the wing and tail surface airfoils operating in a more “viscous” environment, or technically speaking operating at low Reynolds numbers where the aerodynamics becomes more difficult to understand and predict. Important experiments were done by my UIUC Applied Aerodynamics Group to explore this aerodynamics regime and publish the results. With the support of many model aviation enthusiasts, research sponsors, campus, and the combined work of legions of UIUC students maintaining the testing know-how and equipment, the <a class="reference external" href="https://m-selig.ae.illinois.edu/uiuc_lsat.html">UIUC LSATs</a> program ran for approximately 25 years. It yielded low Reynolds number airfoil wind tunnel data on over 200 airfoils. The airfoil lift, drag, and pitching moment data are documented in six book-sized publications and are freely downloadable from my <a class="reference external" href="https://m-selig.ae.illinois.edu/uiuc_lsat.html">campus site</a>. The precursor to these tests was done at Princeton University over a several year period around 1987, and the work produced the SoarTech publication “Airfoils at Low Speeds” book, which is also freely downloadable from my campus site.</p> </section> <section id="uiuc-propeller-data-site"> <h2>UIUC Propeller Data Site<a class="headerlink" href="#uiuc-propeller-data-site" title="Permalink to this heading">¶</a></h2> <blockquote> <div><p>Propeller wind tunnel data for small aircraft. Over 250 propellers tested. Downloadable data. Includes propellers from APC, Aeronaut, Graupner, Kyosho, Master Aircrew, GWS, and more.</p> </div></blockquote> <p>In 2003, we started plans to add propellers to the low Reynolds number aerodynamics test campaign. At the time, research quality data on low Reynolds number propellers was scare. Also, interests in small-vehicle electric flight and battery limitations (before the Lipos were ubiquitous) made knowing the performance of propellers more important than ever. From the first publication of data in 2005 through to 2022, the propeller database has grown to over 4 volumes of data and around 250 propellers tested over a range conditions. All the data is freely available online at the <a class="reference external" href="https://m-selig.ae.illinois.edu/props/propDB.html">UIUC Propeller Data Site</a>.</p> <img alt="Image of UIUC propellers" class="align-center" src="_images/props-810p.png" /> </section> <section id="profoil-for-airfoil-design"> <h2>PROFOIL for Airfoil Design<a class="headerlink" href="#profoil-for-airfoil-design" title="Permalink to this heading">¶</a></h2> <blockquote> <div><p>PROFOIL for the design of low speed airfoils. Developed to design airfoils for model aircraft, UAVs/UASs, homebuilt aircraft, wind turbines racing yachts, race cars, etc. Released on GitHub.</p> </div></blockquote> <img alt="Image of AeroVironment high flyer" class="align-right" src="_images/ED01-0209-3-cropped-3.jpg" /> <p>PROFOIL is an inverse design code for low speed airfoils released on <a class="reference external" href="https://github.com/m-selig/PROFOIL">GitHub</a>. At its core, the theory used in PROFOIL is closely related to that used in the Eppler airfoil code dating back to 1957. With PROFOIL, the airfoil designer specifies the desired velocity distribution. The method then solves the inverse problem to find the corresponding airfoil shape, subject to any other specifications that may be prescribed, such as airfoil thickness or pitching moment, and much more. My code was part of my PhD thesis at Penn State. In 1995, I put an interactive <a class="reference external" href="http://www.profoil.org/">simplified version</a> of PROFOIL online. With the source code on GitHub, the interactive version was shutdown in 2023. It had been used to design over 250,000 airfoils in the span of 28 yrs online. The full version of PROFOIL has been used to design airfoils for model aircraft, UAVs/UASs, homebuilt aircraft, both large and small wind turbines, keel and wing foils for the America’s Cup and other racing yachts, and Indy cars and Formula 1. Sponsors of my campus research on airfoil design have included NASA, AeroVironment, Boeing, Naval Research Lab, GE, Siemens, Northern Power Systems, Ford Motorsports, Newman/Haas Racing, Jaguar Racing and Oracle-BMW Racing, Farr Yacht Design and many others.</p> </section> <section id="propid-for-hawt-design"> <h2>PROPID for HAWT Design<a class="headerlink" href="#propid-for-hawt-design" title="Permalink to this heading">¶</a></h2> <blockquote> <div><p>PROPID is an inverse design code for horizontal axis wind turbines. Ongoing development since 1993. Used in the design of small to megawatt scale wind turbines.</p> </div></blockquote> <img alt="Image of PROPID design process from performance specs to blade geometry" class="align-right" src="_images/PROPID-1-small.png" /> <p><a class="reference external" href="https://m-selig.ae.illinois.edu/propid.html">PROPID</a> is a downloadable computer program for the design and analysis of horizontal axis wind turbines (HAWTs). With PROPID, the designer can specify the optimal blade aerodynamics and from that let the method work backward to find the shape of the blade. This approach generally is called an inverse method – flipping the problem around and specifying the output to then get back what is usually the input. Taking this approach is much faster than design by direct analysis where the geometry is input and then manually and iteratively modified to achieve the best performance. Recently, PROPID has been used in research to design highly flexible large downwind ultralight rotors for offshore wind power [<a class="reference external" href="https://m-selig.ae.illinois.edu/publications.html#torque2022-01">pdf</a>].</p> </section> <section id="uiuc-airfoil-database"> <h2>UIUC Airfoil Database<a class="headerlink" href="#uiuc-airfoil-database" title="Permalink to this heading">¶</a></h2> <blockquote> <div><p>Coordinates for over 1600 airfoils online. Hosted at UIUC since 1995 and growing. Includes a companion page that lists many airfoil resources available.</p> </div></blockquote> <img alt="Image of UIUC Airfoil Data Site webpage" class="align-right" src="_images/ads-3.png" /> <p>For airfoil coordinates, the <a class="reference external" href="https://m-selig.ae.illinois.edu/ads/coord_database.html">UIUC Airfoil Coordinates Database</a> is a good place to start. It is part of my UIUC Airfoil Data Site. The site currently includes coordinates for over 1600 airfoils. According to Google Analytics, the site receives between 10,000 and 20,000 unique visitors per month, depending on the time of year (winter in the northern hemisphere is peak airfoil hunting season). The site started in year 1995 with many of my own airfoils (which were previously distributed by email, Gopher/WAIS, mail and in print media). Since then the site has continued to grow with contributions from many people, and the coordinates have populated more and more new online airfoil databases - many with unique and useful features worth checking out. My site also hosts David Lednicer’s page: <a class="reference external" href="https://m-selig.ae.illinois.edu/ads/aircraft.html">The Incomplete Guide to Airfoil Usage</a> that lists the airfoils used on a great number of airplanes.</p> </section> <section id="more-links-and-info"> <h2>More Links and Info<a class="headerlink" href="#more-links-and-info" title="Permalink to this heading">¶</a></h2> <img alt="Image of Eli Field RC Pilots" class="align-right" src="_images/Img_9277-2.png" /> <div class="toctree-wrapper compound"> <ul class="current"> <li class="toctree-l1 current"><a class="current reference internal" href="#">Home</a></li> <li class="toctree-l1"><a class="reference internal" href="youtube.html">YouTube</a></li> <li class="toctree-l1"><a class="reference internal" href="facebook.html">Facebook</a></li> <li class="toctree-l1"><a class="reference internal" href="rcgroups.html">RC Groups (Model Aviation)</a></li> <li class="toctree-l1"><a class="reference internal" href="uiuc.html">UIUC</a></li> <li class="toctree-l1"><a class="reference internal" href="publications.html">Publications</a></li> </ul> </div> <div class="toctree-wrapper compound"> <p class="caption" role="heading"><span class="caption-text">External</span></p> <ul> <li class="toctree-l1"><a class="reference external" href="https://www.seligsim.com">https://www.seligsim.com</a></li> <li class="toctree-l1"><a class="reference external" href="https://www.fsone.com">https://www.fsone.com</a></li> <li class="toctree-l1"><a class="reference external" href="https://michaelselig.substack.com">https://michaelselig.substack.com</a></li> <li class="toctree-l1"><a class="reference external" href="https://m-selig.ae.illinois.edu/">https://m-selig.ae.illinois.edu/</a></li> </ul> </div> <p>SeligSIM, FS One and InertiaSoft are trademarks of InertiaSoft and may be registered.</p> </section> </section> </article> </div> <footer> <div class="related-pages"> <a class="next-page" href="youtube.html"> <div class="page-info"> <div class="context"> <span>Next</span> </div> <div class="title">YouTube</div> </div> <svg class="furo-related-icon"><use href="#svg-arrow-right"></use></svg> </a> </div> <div class="bottom-of-page"> <div class="left-details"> <div class="copyright"> Copyright &#169; Michael Selig 2025 </div> Made with <a href="https://www.sphinx-doc.org/">Sphinx</a> and <a class="muted-link" href="https://pradyunsg.me">@pradyunsg</a>'s <a href="https://github.com/pradyunsg/furo">Furo</a> </div> <div class="right-details"> </div> </div> </footer> </div> <aside class="toc-drawer"> <div class="toc-sticky toc-scroll"> <div class="toc-title-container"> <span class="toc-title"> On this page </span> </div> <div class="toc-tree-container"> <div class="toc-tree"> <ul> <li><a class="reference internal" href="#">Michael Selig</a><ul> <li><a class="reference internal" href="#selig-s-newsletter">Selig’s Newsletter</a></li> <li><a class="reference internal" href="#seligsim-rc-flight-simulator">SeligSIM RC Flight Simulator</a></li> <li><a class="reference internal" href="#uiuc-low-speed-airfoil-tests">UIUC Low-Speed Airfoil Tests</a></li> <li><a class="reference internal" href="#uiuc-propeller-data-site">UIUC Propeller Data Site</a></li> <li><a class="reference internal" href="#profoil-for-airfoil-design">PROFOIL for Airfoil Design</a></li> <li><a class="reference internal" href="#propid-for-hawt-design">PROPID for HAWT Design</a></li> <li><a class="reference internal" href="#uiuc-airfoil-database">UIUC Airfoil Database</a></li> <li><a class="reference internal" href="#more-links-and-info">More Links and Info</a><ul> </ul> </li> </ul> </li> </ul> </div> </div> </div> </aside> </div> </div><script data-url_root="./" id="documentation_options" src="_static/documentation_options.js?v=99fc33ec"></script> <script src="_static/doctools.js?v=888ff710"></script> <script src="_static/sphinx_highlight.js?v=4825356b"></script> <script src="_static/scripts/furo.js?v=5fa4622c"></script> </body> </html>

Pages: 1 2 3 4 5 6 7 8 9 10