Questions and Answers
What is the definition of a constant-speed prop?
More info about constant speed prop
What is a force that is always present during the operation of the propeller and must be overcome to cause a change in blade angle?
Fixed force
What is the most commonly used variable force that will cause a change in blade angle?
Oil pressure
How does the propeller governor respond to the change in the system RPM?
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What happens to the flyweights when the RPM increases?
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What happens to the flyweights when the RPM decreases?
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What is the function of the pilot valve?
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What opposes the movement of the flyweights?
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The governor is in which position when the flyweights are tilted outward and the pilot valve is raised?
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The governor is in which position when the flyweights are tilted inward?
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Study Notes
Constant-Speed Propeller
- A constant-speed propeller automatically adjusts its blade angle to maintain a set RPM, optimizing efficiency and performance.
Fixed Force
- Always present during propeller operation, must be overcome to change the blade angle.
Variable Force
- Oil pressure is the primary variable force that counteracts the fixed force, enabling changes to the blade angle.
Propeller Governor Function
- Responds to RPM changes by directing oil pressure to adjust the blade angle, returning system RPM to its original value.
Flyweights Mechanics
- When RPM increases, flyweights tilt outward, raising the pilot valve.
- When RPM decreases, flyweights tilt inward, lowering the pilot valve.
Pilot Valve Role
- Adjusts oil flow based on RPM changes to maintain the desired propeller speed through blade angle adjustments.
Speeder Spring
- Opposes flyweights' movement, playing a crucial role in regulating the governor's response to RPM fluctuations.
Overspeed Condition
- Occurs when flyweights are tilted outward, indicating the governor is in an overspeed position.
Underspeed Condition
- Occurs when flyweights tilt inward, indicating the governor is in an underspeed position.
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Explore the key concepts of constant-speed propellers with these flashcards. Each card provides a definition or explanation to enhance your understanding of aircraft systems. Perfect for aviation enthusiasts and pilots alike.
