Propellers Flashcards
- What is the purpose of a propeller?
Create thrust & pull or push aircraft through air
- What are the two types of propeller configurations?
Tractor
Pusher
- What type of propeller has the blade angle built into the propeller and cannot be changed?
Fixed pitch
- What is the purpose of the metal tipping on the leading edge of a wooden propeller?
Protect the propeller from damage from FOD
- What tool is used to determine propeller blade angle?
Universal protractor
- What are the aerodynamic forces and loads acting on a rotation propeller blade?
Centrifugal force
Aerodynamic twisting
Centrifugal twisting
Torque bending
Thrust bending
- What is the meaning of propeller blade “back” & “face”?
Curved side is the blade back
Flat side is the blade face
- What should be used to clean aluminum and steel propeller blades and hubs?
Cleaning solvent with brush or cloth
- What positions are usedon a balance stand to check a two bladed propeller for static balance?
Vertical
Horizontal
- Can a fixed pitch propellers pitch be changed?
No
- Why do you put the blades of a counterweight propeller into high pitch before stopping the engine?
Protect from dirt & moisture
- What are cones installed on splined shafts with a propeller?
Cones center propeller on shaft
- How is feathering accomplished on a constant speed counterweight propeller?
Releasing governor oil pressure on counterweights
- What types of systems are used for de icing propellers?
Fluid or electrical de icing system
- What is the purpose of a slinger ring on some propeller installations?
Fluid injected centrifugal force transfers through small tubes to propeller leading edge
- What is blade tracking?
Position of blade tips relative to each other
- Do the counterweights on a constant speed propeller increase or decrease the blade angle?
Increase
- What should you adjust if a pilot request 50 more RPM on an aircraft equipped with a constant speed propeller?
Adjust governor prop lever set screw
- What adjustments are powerplant mechanics allowed to make to the prop governor?
Only maximum RPM
- What are propellers indexed to the crankshaft of the engine?
Reduce vibrations
- Can transverse cracks in a propeller be repaired?
No
- What is the alpha range and beta range of a propeller?
Beta - condition of propeller during ground operations
Alpha - propeller position in flight
- When Changing metal bushings on a wood propeller assembly a thorough inspections of the bolt holes should be accomplished. Why?
Elongation of holes
- What happens to a constant speed feathering propeller when the propeller governors oil pressure drops to 0psi?
Low pitch stop engages to prevent blade angle changes
- What is the purpose of an arbor when balancing a propeller?
Support the propeller on balance knives
