Discussion
Match each component in List I with its contribution in List II.
List I
A. Fin
B. Fuselage
C. Tractor propeller
D. Swept wing
List II
1. Strongly stabilising, acting well aft
2. Destabilising, tending to increase the yaw
3. Destabilising, side force acting forward
4. Modestly stabilising through differential drag
Select the correct match.
Answer: B
Correct answer: A-1, B-2, C-3, D-4
The fin is strongly stabilising, its side force acting well aft of the centre of gravity. The fuselage is destabilising, tending to increase the yaw, since most of its side area lies forward. A tractor propeller is destabilising for the same geometric reason, its side force acting at the disc ahead of the centre of gravity.
The swept wing is modestly stabilising through differential drag: in sideslip the forward wing meets the flow at a lower effective sweep, presents more area and produces more drag, yawing the nose back into the wind. Sign is decided by which side of the centre of gravity the force acts.
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