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Rear fuselage upsweep is provided principally to

  • A.Reduce the fuselage's wetted area
  • B.House the auxiliary power unit
  • C.Improve directional stability
  • D.Give tail clearance at rotation

Answer: D

The tail must clear the runway as the aircraft rotates, and sweeping the underside up achieves that far more cheaply than lengthening the gear. Excessive upsweep separates the flow and adds drag, so it is kept to what the rotation angle demands.

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