Memory Flashcards
Counterweights on constant-speed propellers are generally used to aid in?
a) Increasing blade angle
b) Decreasing blade angle
c) Unfeathering the propellers
(a) Increasing blade angle
Counterweights are used to?
Counterweights are used to increase blade angle on constant speed propellers
Maximum taper contact between the engine drive shaft and propeller hub is determined by using?
a) Bearing blue colour transfer
b) A micrometer
c) A surface gauge
a) Bearing blue colour transfer
The fit of the hub on the crankshaft should checked by the use of transfer ink such as Engineer’s Blue. The Engineer’s Blue is applied in a thin, even coating on the tapered area of the crankshaft
Remove the hub and note the amount of blue transferred from the shaft to the hub. The dye transfer should indicate that there is a minimum contact area of 70%
The propeller governor controls the?
a) Oil to and from the pitch changing mechanism
b) Spring tension on the boost pump speeder spring
c) Linkage and counterweights from moving in and out
a) Oil to and from the pitch changing mechanism
'’It will be the job of the governor to vary this oil pressure as necessary to adjust blade pitch’’
fixed forces = counterweight, spring tension, CTM
variable force = oil pressure
What are the fixed and variable forces at play in a constant speed single acting prop?
Fixed forces:
- Counterweight
- Spring tension
- CTM
Variable Forces:
Oil pressure
Which of the following statements is correct?
a) Cuts across the grain of wooden propellers can be repaired by working glue into it
b) Cuts with the grain of wooden propellers can be repaired by working glue into it.
c) Wooden propellers which have some lamination separation near the centre of the propeller can be repaired
b) Cuts with the grain of wooden propelers can be repaired by working glue into it
'’Can be repaired if only the outer lamination is separated’’ - not just near centre as per c)
