Discussion
Consider the following pairs of limit and what sets it:
Aft centre of gravity limit - Minimum acceptable static margin
Forward centre of gravity limit - Elevator power at low speed
Neutral point - Zero pitching moment slope
Forward centre of gravity limit - Minimum acceptable static margin
How many of the pairs given above are correctly matched?
Answer: B
Correct answer: Only three
The aft limit is set by the minimum acceptable static margin, the forward limit by the elevator power available at low speed, and the neutral point is where the moment slope is zero - three correct pairs. The fourth attributes the forward limit to the static margin, which is exactly the wrong way round: at the forward limit the margin is at its largest, and it is control authority, not stability, that runs out.
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