Airfoil Archive. Includes most every airfoil (wing shape) made. Approx 2000 airfoils. These airfoils are in data coordinates and not image files. They are accurately printed at any scale. Note: You must also download the software to display or print/plot these. (use Wing profiler.zip)
Plans to construct your own professional wind tunnel. Designed by NASA, very nicely done. Low cost project (can be built for less then $250.00) This is one project you will never get bored with!
Most of the airplane, helicopter and ultralight plans sold online have been downloaded from this site: ultraligero.net
The site has both English and Spanish pages. It also has FAA manuals, legal forms, manuals, etc... Learn To Fly Your Plane Before It Is Finished.
This site is in Spanish but there's an English version which has most of the content of the home site.
You'll also find Cri-Cri plans, helicopter, sailplane, glider, hang-glider, autogyro, Model airplane plans (747 in all), wing fabrication files, shroud, electronics, registration, games, conversion 1/2 VW engine... In fact most if not all the airplane and ultralight plans sold on eBay were taken down from this website.
More Plans Basic Ultraligh Glider (BUG)
The Goat4 and Bug4, are home built, basic ultralight gliders. Technically these aircraft are ultralight sailplanes, but they are best described as "airchairs", which are simple, slow flying gliders with the pilot sitting out in the open air rather than inside a fuselage.