Discussion
Statement I: A propeller ahead of the centre of gravity is destabilising in yaw.
Statement II: Its side force in sideslip acts forward of the centre of gravity.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. A propeller in sideslip meets the flow obliquely, and the resulting side force acts at the propeller disc - ahead of the centre of gravity on a tractor installation.
A side force forward of the centre of gravity yaws the nose further from the relative wind, which is destabilising by definition. It is the same geometric argument that makes the fuselage destabilising, and the reason both must be overcome by the fin. A pusher propeller, acting behind the centre of gravity, contributes in the opposite and stabilising sense.
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