Question

Determine the required thrust coefficient to produce thrust of 1000N. Given diameter is 1.2m and n=22 rps.

(a) 0.813

(b) 0.1

(c) 0.32

(d) 0.489

I got this question during an online exam.

My question is from Propulsion in chapter Propulsion of Aircraft Design

Answer 1

Right answer is (a) 0.813

Explanation: Thrust coefficient = Thrust / (density*diameter^4*rps^2) = 1000 / (1.225*1.2^4*22^2) = 0.813.