Constant Speed Propellers

Question 1

Constant speed propeller is also known as?

Answer 1

variable pitch propeller

Question 2

advantage of constant speed prop

Answer 2

the ability to convert a high percentage of engine power into thrust

Question 3

what determines the high and low pitch stops

Answer 3

constant speed range

Question 4

how does the pilot control the RPM?

Answer 4

Using the Prop RPM control while monitoring the tachometer

Question 5

How does the pilot control the engine power?

Answer 5

using the throttle while monitoring MAP gauge

Question 6

The device used to control the propeller pitch is called a?

Answer 6

Governor

Question 7

responsible for regulating the flow of high pressure oil to the propeller hub

Answer 7

Governor

Question 8

3 main function of a Governor

Answer 8

boosts engine oil pressure
It senses the rotational speed of the engine
It controls the amount of oil to the propeller hub

Question 9

how does the governor regulate the output pressure?

Answer 9

with the use of a spring loaded pressure relief valve

Question 10

how does the engine oil get boosted in the governor?

Answer 10

by an integral gear type pump geared to the engine drive

Question 11

how does the governor senses the engine speed?

Answer 11

uses a set of flyweights

Question 12

What is a pilot valve?

Answer 12

a shuttle valve that directs the flow of governor boost pump oil

Question 13

the prop gov is usually installed where?

Answer 13

front of the engine near the propeller or it can be installed on the accessory case

Question 14

how is the governor operated by the pilot?

Answer 14

prop lever in the flight deck

Question 15

Without any oil pressure acting on the piston the centrifugal twisting force hold the blades in?

Answer 15

low pitch position

Question 16

what happens to the flyweights in an under speed condition?

Answer 16

the flyweights move inward and release oil from the propeller hub and send it back to the engine sump to increase propeller RPM

Question 17

what happens to the flyweights in an over speed condition?

Answer 17

the flyweights move outward and allow the oil from the governor boost pump to flow to the hub and apply pressure to the piston and increase propeller blade pitch to slow the propeller RPM down

Question 18

what happens to the flyweights in an on speed condition?

Answer 18

the flyweights hold the pilot valve in a neutral position the flow of oil is stopped