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VX and VY with take-off flaps will be:
  • A
    lower than that for clean configuration.
  • B
    changed so that VX increases and VY decreases compared to clean configuration.
  • C
    higher than that for clean configuration.
  • D
    same as that for clean configuration.
Refer to figure.
Effect of flaps on climb

With a higher flap angle setting, the profile of the wing is changed and the wing’s capability to provide lift at low speed increases. The actual generated lift though remains the same, considering the lower speed. For the same amount of Lift, induced drags don’t change. With the change of wing shape the parasite drag increases, consequently Total Drag curve moves left and upwards. This reduces VMD, VX, VY and the rate of climb achieved.

Increasing ROC VY VX PROP VY VX JET
Altitude Reduces Same Lower
Temperature Reduces Same Lower
Mass Reduces Higher Higher
Flap Angle Reduces Lower Lower

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