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.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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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 = 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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