Turboprop Propellers (Jeppesen Powerplant 12-D)

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"

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

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

1. Fixed shaft design

2. Free turbine design

Explain how a “Fixed Shaft Design” turboprop engine works

Explain how a “Free Turbine” turboprop engine works

“All turboprop engines use “-” , “______” propellers”

All turboprop engines use constant-speed, feathering propellers

Define Alpha Mode

When a reversible-pitch propeller is operated in the standard, constant-speed mode.

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

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