Variable Pitch Prop

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Last updated 10:57 AM on 8/3/26
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8 Terms

1
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Increasing forward airspeed

AoA decreases due to change in angle of relative airflow

2
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Prop efficiency

(Thrust x TAS) / (Torque x 2PiN)

3
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Course / Fine pitch

Course = blade is more parallel to horizontal plane

Fine = Blade is more perpendicular

Fine is takeoff and course is cruise

4
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Centrifugal twisting movement

Acts to make the blade fine

5
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Aerodynamic twisting moment

Moves the blade to course

6
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Windmilling prop

The ATM and CTM both work to make the prop to fine

7
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Flyweights

Flyweights spin out, centrifugal force forces a spring up or down which moves a piston, allowing oil in/out of the prop hub which changes the prop AoA

8
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Da42

Constant speed, Variable Pitch, Hydraulically controlled - breadbox oil pressure, regulated by electrically operated governor valve, controlled by ECU

If below 1300rpm, engine may not feather