Question

A glider has aspect ratio of 20 and CD0 of 0.02. In order to attain maximum range, determine the value required aerodynamic efficiency. Take e as 1.

(a) 28.02

(b) 20

(c) 30

(d) 43

This question was addressed to me in my homework.

My doubt stems from Flight Mechanics topic in section Performance and Flight Mechanics of Aircraft Design

Answer 1

Correct answer is (a) 28.02

To explain: Aerodynamic efficiency= 0.5*(π*e*aspect ratio/CD0)^0.5

= 0.5*(π*1*20/0.02)^0.5 = 28.02.