The ultralight plane Gossamer Condor in 1977 was the fi rstto complete the Kremer Prize fi gure-eight course under humanpower. Its wingspan was 29 m, with Cav = 2.3 m and atotal mass of 95 kg. The drag coeffi cient was approximately0.05. The pilot was able to deliver 1/4hp 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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