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A designer proposes moving a large tractor propeller further forward on a single engine aeroplane to improve the centre of gravity range.

What directional consequence should be considered?

  • A.Sideslip becomes impossible
  • B.Its destabilising contribution grows
  • C.Directional stability improves
  • D.The fin's effectiveness increases

Answer: B

The disc's side force acts further ahead of the centre of gravity, so its destabilising moment grows. The fin may need enlarging to restore the derivative, which partly offsets whatever was gained on the loading range.

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