Transcript Document

Blade Angle vs. RPM
High Angle – Low RPM
Low Angle – High RPM
Constant Speed Principles
Prop Governor adjusts blade angles
to maintain RPM
MEDIUM PITCH
On Speed – Blade Angle OK
Blade Angle vs. RPM
High Angle – Low RPM
Low Angle – High RPM
Constant Speed Principles
Prop Governor adjusts blade angles
to maintain RPM
Over Speed – Blade Angle increases
HIGHER PITCH
On Speed – Blade Angle OK
Blade Angle vs. RPM
High Angle – Low RPM
Low Angle – High RPM
Constant Speed Principles
Prop Governor adjusts blade angles
to maintain RPM
Over Speed – Blade Angle increases
LOWER PITCH
On Speed – Blade Angle OK
Under Speed – Blade Angle decreases
Propeller Governor
Fly-Weights
Speeder Spring
Power Lever
Prop Control
Pilot Valve
Beta Valve
Beta Ring
Low Pitch
Stop Nut
Propeller Governor
Prop Control
On-Speed
Power Lever
RPM
Setting
Actual
RPM
2000
2000
MEDIUM PITCH
Propeller Governor
Prop Control
Over-Speed
Power Lever
RPM
Setting
Actual
RPM
2000
2005
HIGHER PITCH
Propeller Governor
Prop Control
Under-Speed
Power Lever
RPM
Setting
Actual
RPM
2000
1995
LOWER PITCH
Propeller Governor
Low Pitch Stop
Prop Control
Power Lever
RPM
Setting
Actual
RPM
2000
1990
LOWER PITCH
Propeller Governor
Low Pitch Stop
Prop Control
Power Lever
Under-Speed
RPM
Setting
Actual
RPM
2000
1990
Beta Valve Closes
LOWER PITCH
Low Pitch Stop Nut
Pulls Beta Ring Forward
Over-Speed Governor
Prop Gov
Test
Pre-set: 2288 RPM
Over-Speed Governor
Prop Gov. Failed
Prop Gov
Test
Over-Speed Governor
Prop Gov. Failed
Prop Gov
Test
At 2288 RPM
Overspeed Governor
Assumes Control
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