Question

If thrust loading is 0.65 then, find the power loading of a prop aircraft. Consider propeller is idle.

(a) 846.15/V

(b) 846.15

(c) 650

(d) 6.5

The question was asked in an interview.

Origin of the question is Thrust Weight Ratio-1 topic in division Thrust-Weight Ratio and Wing Loading of Aircraft Design

Answer 1

Right option is (a) 846.15/V

To explain I would say: Given, prop aircraft, thrust loading T.L. = 0.65

Since propeller is idle, propeller efficiency ƞ=1. Here, velocity is not mentioned so we will substitute it as V.

Now, thrust loading is given as,

T.L. = T/W = (550*η / V)*(hp/W)

Hence, power loading W/hp = PL = 550*η / (T.L.*V) = 550/(V*0.65) = 846.15/V.