Discussion
Statement I: The fuselage of a conventional aeroplane is destabilising in pitch.
Statement II: A slender body in a flow experiences a moment tending to increase its incidence.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. An inclined slender body carries an unstable moment that acts to increase its incidence, so the fuselage adds a positive term to the moment slope. The effect is strongest for a long fuselage forward of the wing, which is why nose length and forebody shape enter the stability estimate and why a large fuselage may drive the tail size.
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