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State how the values of VX/VY will vary with increased airplane mass…

  • A
    Both are independent of mass
  • B

    VX depends only on mass and VY decreases

  • C

    VX decreases and VY increases

  • D

    Both increase

Refer to figure.
The Effect of Weight on Drag

If an aircraft is operated at a higher gross weight, more lift will be required.
If more lift is generated, induced drag will be higher, total drag will be greater and VMD will occur at a higher IAS.

Speed of Best Angle of Climb (VX)

The speed to gain more altitude with the least horizontal distance. It is almost the same speed as the minimum drag speed (VMD), so all factors affecting the drag affects the VX.

Speed of Best Rate of Climb (VY)

The speed to gain more altitude with the least time. It is the same speed for maximum excess of power, so all factors affecting the require power affects the VY.

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