Propellers

Question 1

1. What is the purpose of a propeller?

Answer 1

Create thrust & pull or push aircraft through air

Question 2

2. What are the two types of propeller configurations?

Answer 2

Tractor
Pusher

Question 3

3. What type of propeller has the blade angle built into the propeller and cannot be changed?

Answer 3

Fixed pitch

Question 4

4. What is the purpose of the metal tipping on the leading edge of a wooden propeller?

Answer 4

Protect the propeller from damage from FOD

Question 5

5. What tool is used to determine propeller blade angle?

Answer 5

Universal protractor

Question 6

6. What are the aerodynamic forces and loads acting on a rotation propeller blade?

Answer 6

Centrifugal force
Aerodynamic twisting
Centrifugal twisting
Torque bending
Thrust bending

Question 7

7. What is the meaning of propeller blade “back” & “face”?

Answer 7

Curved side is the blade back
Flat side is the blade face

Question 8

8. What should be used to clean aluminum and steel propeller blades and hubs?

Answer 8

Cleaning solvent with brush or cloth

Question 9

9. What positions are usedon a balance stand to check a two bladed propeller for static balance?

Answer 9

Vertical
Horizontal

Question 10

10. Can a fixed pitch propellers pitch be changed?

Answer 10

No

Question 11

11. Why do you put the blades of a counterweight propeller into high pitch before stopping the engine?

Answer 11

Protect from dirt & moisture

Question 12

12. What are cones installed on splined shafts with a propeller?

Answer 12

Cones center propeller on shaft

Question 13

13. How is feathering accomplished on a constant speed counterweight propeller?

Answer 13

Releasing governor oil pressure on counterweights

Question 14

14. What types of systems are used for de icing propellers?

Answer 14

Fluid or electrical de icing system

Question 15

15. What is the purpose of a slinger ring on some propeller installations?

Answer 15

Fluid injected centrifugal force transfers through small tubes to propeller leading edge

Question 16

16. What is blade tracking?

Answer 16

Position of blade tips relative to each other

Question 17

17. Do the counterweights on a constant speed propeller increase or decrease the blade angle?

Answer 17

Increase

Question 18

18. What should you adjust if a pilot request 50 more RPM on an aircraft equipped with a constant speed propeller?

Answer 18

Adjust governor prop lever set screw

Question 19

19. What adjustments are powerplant mechanics allowed to make to the prop governor?

Answer 19

Only maximum RPM

Question 20

20. What are propellers indexed to the crankshaft of the engine?

Answer 20

Reduce vibrations

Question 21

21. Can transverse cracks in a propeller be repaired?

Answer 21

No

Question 22

22. What is the alpha range and beta range of a propeller?

Answer 22

Beta - condition of propeller during ground operations
Alpha - propeller position in flight

Question 23

23. When Changing metal bushings on a wood propeller assembly a thorough inspections of the bolt holes should be accomplished. Why?

Answer 23

Elongation of holes

Question 24

24. What happens to a constant speed feathering propeller when the propeller governors oil pressure drops to 0psi?

Answer 24

Low pitch stop engages to prevent blade angle changes

Question 25

25. What is the purpose of an arbor when balancing a propeller?

Answer 25

Support the propeller on balance knives