Discussion
Assertion (A): A pusher propeller is directionally preferable to a tractor.
Reason (R): Its side force acts behind the centre of gravity and is therefore stabilising.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains the preference. A propeller in sideslip meets the flow obliquely and generates a side force at the disc; on a pusher installation that disc is behind the centre of gravity.
A side force acting aft produces a moment that reduces sideslip, so the pusher contributes in the stabilising sense while a tractor contributes in the destabilising one. It is the same geometric argument that makes the fin stabilising and the forward fuselage destabilising. Directional stability is only one consideration among many, of course - ground clearance, cooling and blade noise all argue the other way.
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