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If the RPM lever of a constant speed propeller is moved forward during a glide with idle power and whilst maintaining constant airspeed, the propeller pitch will:
  • A
    increase and the rate of descent will increase.
  • B
    increase and the rate of descent will decrease.
  • C
    decrease and the rate of descent will increase.
  • D
    decrease and the rate of descent will decrease.

Refer to figure.

A single engine airplane fitted with a constant speed propeller may not have a “feathering” capability, as such. However, following engine failure, drag can be reduced to a minimum by “pulling” the RPM (prop) control to the fully coarse position.
In a steady glide with no shaft power from the engine (throttle closed), if the propeller pitch is decreased by pushing forward the prop’ lever, the aircraft Lift/Drag ratio will decrease. This will increase the rate of descent.
The opposite will be true if the propeller pitch is increased.

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