Question

Yawing moment is positive if __________

(a) right wing goes back

(b) right wing comes forward

(c) if nose pitches up

(d) if nose pitches down

This question was addressed to me by my school teacher while I was bunking the class.

Question is from Lateral-Directional Static Stability and Control in portion Stability, Control, and Handling Qualities of Aircraft Design

Answer 1

Correct answer is (a) right wing goes back

To explain I would say: Yawing moment is said to be positive by sign convention if right wing goes back and vice versa. If nose pitches up then it is a positive pitching moment and similarly if nose pitches down it is called negative pitching moment as per the sign convention is considered.