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A folding wingtip is adopted on some transports in order to

  • A.Improve high-speed cruise efficiency directly
  • B.Simplify the fuel system
  • C.Gain span yet still fit the gate box
  • D.Reduce structural weight

Answer: C

Correct answer: Gain span yet still fit the gate box

Airport gate boxes fix the parked span - 36 m for ICAO Code C, 65 m for Code E - and exceeding one cuts the aircraft off from a large number of stands. A folding tip lets the wing be built with the greater span that lowers induced drag in flight, then folded on the ground to stay within the box. The mechanism adds weight and complexity, so it is adopted only where the aerodynamic gain outweighs them.

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