Question

A propeller is rotating with 20 rps has diameter of 2.5m. Calculate thrust produced by the propeller if thrust coefficient is 0.01.

(a) 191.40N

(b) 2000kN

(c) 1.2MN

(d) 190KN

The question was posed to me in quiz.

Origin of the question is Propulsion in division Propulsion of Aircraft Design

Answer 1

Right answer is (a) 191.40N

For explanation: Thrust = Thrust coefficient*density*diameter^4*rps^2 = 0.01*1.225*2.5^4*20^2 = 191.40 N.