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King Air E90 Propeller. Blade Angle vs. RPM. High Angle – Low RPM. Low Angle – High RPM. Constant Speed Principles. Prop Governor adjusts blade angles to maintain RPM. On Speed – Blade Angle OK. Blade Angle vs. RPM. High Angle – Low RPM. Low Angle – High RPM. Constant Speed Principles. - PowerPoint PPT Presentation
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MEDIUM PITCH
Blade Angle vs. RPM
High Angle – Low RPM
Low Angle – High RPM
Constant Speed PrinciplesProp Governor adjusts blade angles to maintain RPM
On Speed – Blade Angle OK
Blade Angle vs. RPM
High Angle – Low RPM
Low Angle – High RPM
Constant Speed PrinciplesProp Governor adjusts blade angles to maintain RPM
On Speed – Blade Angle OK
Over Speed – Blade Angle increasesHIGHER PITCH
Blade Angle vs. RPM
High Angle – Low RPM
Low Angle – High RPM
Constant Speed PrinciplesProp Governor adjusts blade angles to maintain RPM
On Speed – Blade Angle OK
Over Speed – Blade Angle increases
Under Speed – Blade Angle decreases
LOWER PITCH
Prop Control Power Lever
Speeder SpringFly-Weights
Pilot Valve
Propeller Governor
Beta Ring
Low PitchStop Nut
Beta Valve
Prop Control Power Lever
Propeller Governor
On-SpeedRPM
SettingActualRPM
2000 2000
MEDIUM PITCH
Prop Contro l Power Lever
Propeller Governor
Over-SpeedRPM
SettingActualRPM
2000 2005
HIGHER PITCH
Prop Contro l Power Lever
Propeller Governor
Under-SpeedRPM
SettingActualRPM
2000 1995
LOWER PITCH
Propeller Governor
RPMSetting
ActualRPM
2000 1990
LOWER PITCH
Low Pitch Stop
P rop C on tro l P ow er Leve r
Propeller Governor
RPMSetting
ActualRPM
2000 1990
LOWER PITCH
Low Pitch Stop
Under-Speed
P rop C on tro l P ow er Leve r
Beta Valve Closes
Low Pitch Stop NutPulls Beta Ring Forward
Prop GovTest
Over-Speed Governor
Pre-set: 2288 RPM
Prop GovTest
Over-Speed Governor
Prop Gov. Failed
Prop GovTest
Over-Speed Governor
Prop Gov. Failed
At 2288 RPMOverspeed Governor
Assumes Control
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