The ultralight plane Gossamer Condor in 1977 was the fi rst to complete the Kremer Prize
Chapter 8, Problem p8.82(choose chapter or problem)
The ultralight plane Gossamer Condor in 1977 was the fi rst to complete the Kremer Prize fi gure-eight course under human power. Its wingspan was 29 m, with Cav 5 2.3 m and a total mass of 95 kg. The drag coeffi cient was approximately 0.05. The pilot was able to deliver 1 4 hp to propel the plane. Assuming two-dimensional fl ow at sea level, estimate (a) the cruise speed attained, (b) the lift coeffi cient, and (c) the horsepower required to achieve a speed of 15 kn.
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