Question

As a designer, our task is to design wing layout such that the location of MAC from root chord or centre line is at 8ft. Find the appropriate value of the wingspan if wing is rectangular.

(a) 32ft

(b) 50ft

(c) 28m

(d) 32m

This question was posed to me during an online exam.

The doubt is from Configuration Layout topic in chapter Configuration Layout and Loft of Aircraft Design

Answer 1

The correct choice is (a) 32ft

To elaborate: Given, rectangular wing.

MAC location y = 8ft. As wing is rectangular taper ratio t =1.

Wingspan b = (6*y*(1+ t)) / (1+t+t^2) = 6*8*(1+1) / (1+1+1^2) = 6*8*2/3 = 32ft.