A sail plane with a lift-to-drag ratio of 25 flies with a speedof 50 mph. It maintains
Chapter 9, Problem 9.113(choose chapter or problem)
A sail plane with a lift-to-drag ratio of 25 flies with a speedof 50 mph. It maintains or increases its altitude by flying in thermals,columns of vertically rising air produced by buoyancy effectsof nonuniformly heated air. What vertical airspeed is needed if thesail plane is to maintain a constant altitude?
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