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An airplane has a lift - drag relation of CD = 0 . 0 1 5 + 0 . 0 6 0 CL 2 ,

An airplane has a lift-drag relation of CD=0.015+0.060CL2, weight is 20,000 lb., wing area is 200 square ft. If this airplane is propellerdriven, what is the speed corresponding for best endurance at sea level?

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