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What does a positive stick force gradient with speed give the pilot?

  • A.An automatic return to level flight after a disturbance in bank
  • B.A force cue that resists departure from the trimmed speed
  • C.A lighter control at high speed
  • D.Protection against control surface flutter

Answer: B

It gives a tactile cue: as the aeroplane speeds up from trim the pilot feels a push, and as it slows down a pull, so speed is held almost without conscious effort and an inadvertent departure announces itself through the hand rather than the instruments. That is why a minimum gradient is required and why a downspring is fitted when aft loading makes it too shallow. The control gets heavier rather than lighter at speed. Flutter is a structural dynamics matter untouched by force gradients. And bank recovery is a lateral property with no connection to the elevator circuit.

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