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When flying the "Backside of Thrust curve" means…
  • A
    a thrust reduction results in an acceleration of the aeroplane.
  • B
    the thrust required is independent of the airspeed.
  • C
    a lower airspeed requires less thrust because drag is decreased.
  • D
    a lower airspeed requires more thrust.

Refer to figure.
Region of Reverse Command

To maintain unaccelerated flight at an IAS slower than VMD, Thrust Available must be increased. This is because at speeds below VMD, Thrust Required (Drag) increases. The speed region slower than VMD has three alternative names:

  • The back-side of the Drag curve
  • The speed unstable region
  • The region of Reverse Command: so called because to maintain unaccelerated flight at an IAS slower than VMD, Thrust must be increased – the reverse of what is “Normally” required.

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