Discussion
Consider the following statements about relaxed static stability:
1. It reduces trim drag and permits a smaller tail.
2. It requires artificial stabilisation through the control system.
3. It improves the aircraft's natural handling qualities.
Which of the statements given above is or are correct?
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: a reduced or negative static margin cuts the tail download needed to trim, so trim drag falls and the tail can be made smaller, and stability must then be supplied artificially. Statement 3 is the opposite of the truth - the natural handling qualities are worse, which is exactly why the control system has to make them good.
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