Discussion
Consider the following pairs of change and its effect:
Moving the centre of gravity forward - More stable, heavier stick forces
Lengthening the tail arm - Larger tail volume ratio
Increasing downwash at the tail - Reduced tail contribution to stability
Moving the centre of gravity aft - More stable
How many of the pairs given above are correctly matched?
Answer: C
Correct answer: Only three
Moving the centre of gravity forward increases the margin and so the stick forces; lengthening the tail arm increases \( V_H \); and greater downwash reduces the tail\'s effective angle of attack change and with it its contribution. The fourth pair is wrong: moving the centre of gravity aft reduces the static margin and makes the aeroplane less stable, which is why an aft limit exists at all.
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