Question

If slip function of propeller is 0.075 and diameter is 20 ft. then, determine the velocity of propeller. Given n = 25 rps.

(a) 37.5 ft/s

(b) 40ft/min

(c) 128ft

(d) 300ft/s^2

I have been asked this question during an online exam.

My question is based upon Propulsion topic in chapter Propulsion of Aircraft Design

Answer 1

The correct choice is (a) 37.5 ft/s

To explain I would say: Velocity = slip function*diameter*rps = 0.075*20*25 = 37.5 ft/s.