Question

Is flat bottomed wing is more efficient than fully-symmetrical airfoil?

(a) True

(b) False

I had been asked this question by my college director while I was bunking the class.

The origin of the question is The Symmetric Airfoil topic in section Incompressible Flow over Airfoils of Aerodynamics

Answer 1

Right answer is (a) True

Explanation: The flat bottomed wing is more efficient at low speeds than a fully-symmetrical airfoil with an angle of attack less, so that the reason most of the flat bottomed, under cambered wing uses less power and drag for the same lift.