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With increasing altitude, what will happen to VY and excess power?

  • A

    VY expressed as a TAS will increase and excess power will decrease.

  • B
    VY expressed as a TAS will decrease and excess power will decrease.
  • C
    VY expressed as a IAS will decrease and excess power will increase.
  • D
    VY expressed as a IAS will increase and excess power will decrease.

Refer to figure.
As altitude increases, the power available lines comes down at a shallower angle eventually reaching a situation where the power available line is tangent to the power required – this is the point where there is no excess power, no rate of climb and the aircraft reached the absolute ceiling where VY = VX.

Additionally, an increase in altitude will cause the power required curve to slide up and right along the tangent.

  • VY as TAS will increase and the excess of power will decrease as altitude increases.

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