Question

What values of aspect ratio is generally used for helicopter rotor blades?

(a) Zero

(b) Low

(c) High

(d) One

This question was posed to me in an internship interview.

I would like to ask this question from Helicopter Rotor and Notations in section Helicopter Dynamics of Aerodynamics

Answer 1

Correct choice is (c) High

Best explanation: The ratio of its span to its mean chord is the aspect ratio of a wing. It is equal to the square of the wingspan divided by the area of the wing. Higher is the aspect ratio, more narrow is the wing and vice versa. A higher aspect ratio wing is generally preferred for helicopters as it reduces the tip vortices thus reducing drag.