Discussion
Match each empennage quantity in List I with its definition in List II.
List I
A. Tail volume coefficient
B. Static margin
C. Tail arm
D. Neutral point
List II
1. Distance between wing and tail aerodynamic centres
2. Tail area times arm, normalised on wing reference quantities
3. Centre of gravity position at which stability is neutral
4. Distance from centre of gravity to neutral point, in chords
Select the correct match.
Answer: B
Correct answer: A-2, B-4, C-1, D-3
Each term has a distinct definition. The tail volume coefficient is tail area times arm normalised on wing reference quantities; the static margin is the distance from centre of gravity to neutral point, expressed in chords.
The tail arm is the physical distance between the wing and tail aerodynamic centres, and the neutral point is the centre of gravity position at which stability is neutral. Two of the four are dimensionless and two are positions or lengths, which is the quickest way to halve the matching.
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