Aircraft Propellers Flashcards
Propellers convert engine power into thrust by accelerating air rearward. From simple fixed-pitch wooden or metal blades to sophisticated constant-speed and feathering systems, understanding propeller types, operation, and maintenance is essential for the Powerplant certificate.
The FAA Powerplant exam covers propeller types, constant-speed governor operation, feathering and reversing systems, propeller synchronization, and inspection/maintenance procedures. These flashcards cover the components and concepts you need to know.
What You Need to Know
- Fixed-pitch: blade angle is fixed (cannot change in flight)
- Constant-speed (variable pitch): blade angle adjusts automatically to maintain set RPM
- Governor: controls propeller blade angle to maintain constant RPM
- Feathering: blades turn edge-on to the wind (reduces drag on a stopped engine)
- Reversing: blades turn to produce reverse thrust (for landing roll-out)
- Propeller pitch: the angle between the blade chord and the plane of rotation
- Fine pitch: low angle, high RPM (for takeoff)
- Coarse pitch: high angle, low RPM (for cruise)
Why This Topic Appears on FAA Exams
Propeller knowledge is tested because propeller failures can cause severe vibration, loss of thrust, or engine overspeed. Mechanics must understand governor operation, blade inspection, and maintenance requirements. The exam tests component identification, system operation, and inspection criteria.
Sample Flashcards
Tap any card to reveal the answer. These are just a sample — the full deck is available inside the study platform.
What is the difference between a fixed-pitch and constant-speed propeller?
How does a constant-speed propeller governor work?
What is propeller feathering?
What is the purpose of a reversing propeller?
Study Tips
Focus on the difference between fixed-pitch and constant-speed propellers. Know that the governor uses engine oil pressure to change blade angle: high oil pressure = fine pitch (high RPM, low pitch angle), low oil pressure = coarse pitch. Remember feathering: blades go to 90° (edge to wind) to minimize drag on a dead engine. Understand that the governor maintains constant RPM by adjusting pitch as airspeed or power changes.
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Related Topics
Frequently Asked Questions
Engine oil pressure, directed by the governor, acts against a spring and centrifugal counterweights on the propeller hub. Increasing oil pressure drives the blades toward fine pitch (high RPM). Releasing oil pressure allows the springs and counterweights to drive blades toward coarse pitch (low RPM). The governor modulates oil pressure to maintain the selected RPM.
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