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If an airfoil is designed to provide lift curve slope as 7.8, then find airfoil efficiency. The actual lift curve slope of the airfoil is 7.4.(a) 94.87%(b) 45%(c) 15.6%(d) 98.7%The question was posed to me by my college director while I was bunking the class.My question is taken from Aerodynamics topic in portion Aerodynamics of Aircraft Design

Answer»

The correct answer is (a) 94.87%

Explanation: AIRFOIL efficiency = Actual LIFT CURVE slope / theoretical or designed lift curve slope

= 7.4/7.8 = 0.9487 = 94.87%.



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