Which of the following statements about tailplanes is correct?A T-tail is...
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A
more stabilising than a low tailplane because it is less affected by downwash behind the wings.
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B
less stabilising than a low tailplane because it is less affected by downwash behind the wings.
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C
less stabilising than a low tailplane because it is more affected by downwash behind the wings.
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D
more stabilising than a low tailplane because it is more affected by downwash behind the wings.
Refer to figure.
Tail plane effective angle of attack is determined by the downwash from the wing. If the flaps are lowered, the downwash will increase and the tail plane angle of attack will increase, increasing its effectiveness and causing a nose-up pitching moment.
A low mounted tail plane will have its effective angle of attack modified by the changing downwash angle behind the wing. A high mounted tail plane may be outside the influence of the changing downwash angle and not suffer the same disadvantages.
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