A human-powered aircraft (HPA) is an aircraft belonging to the class of vehicles known as human-powered vehicles. It is powered by direct human energy and the force of gravity; the thrust provided by the human may be the only source; however, a hang glider that is partially powered by pilot power is a human-powered aircraft where the flight path c...
Found on
http://en.wikipedia.org/wiki/Human-powered_aircraft
(from the article `airplane`) ...designed with heavy reliance on computers and using the most modern materials. Paul MacCready of Pasadena, Calif., U.S., was the leading exponent ...
Found on
http://www.britannica.com/eb/a-z/h/81
No exact match found.
