: I am a retired elementary teacher writing a high school level book about early aviation. In my research I have found several early aviators who used whirling arm devices to experiment with wing shapes and learn about angles of attack. I want to explain these devices in my book, but I can't because I don't understand them myself. Can you explain them to me or refer me to a book or website that can? Thanks.
Answer : We would suggest the following books and web sites as a good place to start:
1. TAKING FLIGHT by Richard Hallion; Oxford Univ Press, 2003 2. AVIATION: An Historical Survey by Charles Gibbs-Smith; HMSO, 1970 3. HISTORY OF AERODYNAMICS, A by John D. Anderson, Jr.; Cambridge Univ Press,1997 These books can probably be found online by using the search engine: http://www.bookfinder.com
Web Sites: http://www.grc.nasa.gov/WWW/K-12/WindTunnel/history.html http://184.108.40.206/search?q=cache:jN3EgiC4KtMJ:www.cmste.uncc.edu/new/Document%2520Hold/Wind%2520Tunnels%2520-%2520Paper.doc+whirling-arms&hl=en&ct=clnk&cd=9&gl=us http://www.hq.nasa.gov/office/pao/History/SP-440/ch1-1.htm Good Luck, EAA Young Eagles