Discussion
Match each design change in List I with its principal effect in List II.
List I
A. Increase tailplane area
B. Increase fin area
C. Lengthen the rear fuselage
D. Move the centre of gravity aft
List II
1. Raises directional stability
2. Moves the neutral point aft
3. Reduces the static margin
4. Raises both tail volume coefficients
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Each change acts in its own plane. More tailplane area strengthens the longitudinal contribution and moves the neutral point aft; more fin area strengthens the directional contribution and raises directional stability.
Lengthening the rear fuselage increases both tail arms at once, so it raises both tail volume coefficients - the only change here affecting both planes. Moving the centre of gravity aft changes no aerodynamic surface at all; it brings the centre of gravity closer to the neutral point and so reduces the static margin.
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