Turboprop Propellers (Jeppesen Powerplant 12-D)

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12-36 through 12-50. This flashcard set does NOT cover the specific operation of the 331 and the PT6, not relevant to know exact specifics "For the purposes of testing and this class"

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7 Terms

1
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What are the 2 different designs used for driving a turboprop’s power section

1. Fixed shaft design
2. Free turbine design
2
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Explain how a “Fixed Shaft Design” turboprop engine works
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3
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Explain how a “Free Turbine” turboprop engine works
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4
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“All turboprop engines use “____-____” , “______” propellers”
All turboprop engines use __**constant-speed**__, __**feathering**__ propellers
5
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Define __**Alpha Mode**__
When a reversible-pitch propeller is operated in the standard, constant-speed mode.
When a reversible-pitch propeller is operated in the standard, constant-speed mode.
6
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Define __**Beta Mode**__
When the propeller blades are rotated to produce zero or negative thrust

* Divided into two ranges on some aircraft:
* __**Beta for taxi range**__: range between bottom of alpha mode and zero thrust
* __**Beta plus power range**__: the range of negative thrust
When the propeller blades are rotated to produce zero or negative thrust

* Divided into two ranges on some aircraft:
  * __**Beta for taxi range**__: range between bottom of alpha mode and zero thrust
  * __**Beta plus power range**__: the range of negative thrust
7
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What is the difference between a reversing and nonreversing propeller?
The absence of permanently fixed low-pitch stops. The appropriate low-pitch blade angle is achieved and maintained by creating a hydraulic lock with the propeller governor