Question

Which of the following is correct?

(a) (Vtip) static = π*n*d/60 fps

(b) (Vtip) static = n*d feet

(c) (Vtip) static = 2*n*d/360 s

(d) (Vtip) static = d/60 fs

This question was posed to me in examination.

My question is based upon Propulsion in portion Propulsion and Fuel System Integration of Aircraft Design

Answer 1

Right option is (a) (Vtip) static = π*n*d/60 fps

Best explanation: Correct relation is given by,

(Vtip) static = π*n*d/60 fps

Where, n = rpm based on engine data

d = diameter

Units should be observed carefully and equation should be used accordingly.