Question

At what angle does the coefficient of lift over a flat plate become maximum?

(a) 66.6 deg

(b) 54.7 deg

(c) 33.3 deg

(d) 90 deg

I got this question by my college director while I was bunking the class.

My question is from Time-Marching Technique topic in portion Time-Marching Technique of Aerodynamics

Answer 1

Right answer is (b) 54.7 deg

The best explanation: According to the Newton’s theory, the coefficient of lift is given by:

cl = 2sin^3α

This value is maximum for α = 54.7 degrees.