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During a glide with idle power and constant IAS, if the RPM lever of a constant speed propeller is pulled back from its normal cruise position, the propeller pitch will:
  • A
    decrease and the rate of descent will decrease.
  • B
    increase and the rate of descent will decrease.
  • C
    increase and the rate of descent will increase.
  • D
    decrease and the rate of descent will increase.

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 increased by pulling back the prop’ lever, the aircraft Lift/Drag ratio will increase. This will decrease the rate of descent. The RPM would decrease because of the reduction in negative propeller torque.
The opposite will be true if the propeller pitch is decreased.

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