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When considering the effects of increased mass on an aeroplane, which of the following is true?
  • A
    Flight endurance will be increased.
  • B
    Gradient of climb for a given power setting will be higher.
  • C
    Stalling speeds will be higher.
  • D
    Stalling speeds will be lower.
An increased mass on an aeroplane causes the following:
  • Increases the TORR, TODR, ASDR, because it is more difficult to accelerate and the wheel drag is increased.
  • Increases the LDR, because the aircraft approaches with a higher threshold speed, VREF, due to the increased stalling speed.
  • The fuel consumption increases, thus both range and endurance decrease.
  • During climb, increases the induced drag, thus increasing the total drag and reducing the excess thrust (T - D). As a result, the Climb gradient reduces [Climb gradient = (T - D) / W] and stalling speed increases, as both VMD and VMP increase.
  • Alternatively, for the stalling speed: According to the Lift formula, Lift = CLMAX x ½ ρ VS2 x S, when the Lift required increases, because of the increased mass, then the stalling speed, VS, increases too.

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