Question

A twin turboprop engine is flying with 120m/s. Wing of the aircraft has span of 2m and lift co-efficient as 0.15 with aspect ratio as 9.2. Find the lift produced by the wing.

(a) 574.18 N

(b) 574.18

(c) 120 N

(d) 620 N

The question was posed to me in my homework.

My query is from Wing Geometry-1 in chapter Airfoil and Geometry Selection of Aircraft Design

Answer 1

The correct option is (a) 574.18 N

For explanation: Given, a twin turboprop

Velocity V = 120m/s, CL = 0.15, Aspect ratio = 9.2, span b=2m

Aspect ratio = b*b/S

9.2 = 2*2/s

S = 0.434m^2

Now, lift is given by,

L = (1/2)*ρ*V^2*S*CL = 0.5* 1.225*120*120*0.434*0.15 = 574.18N.