PROPELLER Flashcards
What is the purpose of a propeller?
To create thrust and either pull or push the airplane through the air
What are the two types of propeller configurations?
The tractor type and the pusher type
What type of propeller has the blade angle built into the propeller and cannot be changed?
A fixed-pitch propeller
What is the purpose of the metal tipping on a leading edge of a wooden propeller?
It is to protect the propeller from damage caused by flying particles in the air during landing,
taxiing, and takeoff.
What tool is used to determine propeller blade angle?
A universal propeller protractor
What are the aerodynamic forces and loads acting on a rotating propeller blade?
A rotating propeller is acted upon by centrifugal, twisting, and bending forces.
What is the meaning of propeller blade ―back and ―face?
The cambered or curved side of the propeller blade is called the blade back. This is the side of
the blade that faces away from the engine. The flat side of the propeller blade is known as the
blade face. This side of the blade faces the engine.
What should be used to clean aluminum and steel propeller blades and hubs?
They should be washed with a suitable cleaning solvent using a brush or cloth.
What positions are used on a balance stand to check a two-bladed propeller for static balance?
First, the vertical position and then a horizontal position
When centrifugal force acts on the counterweights of a hydraulic counterweight propeller, it tends to rotate
the blades in which direction?
Centrifugal force tends to increase the blade pitch
Why do you put the blades of a counterweight propeller into high pitch before stopping the engine?
This type propeller has a movable cylinder that slides over a fixed piston. In the low pitch
position, the cylinder is outboard and the piston is exposed to the open air, but in the high pitch
position, the cylinder moves inboard and covers the piston. In this position, the piston is
protected from dirt and moisture in the air. This is particularly important if the airplane engine
will not be operated for several days.
Why are cones installed on splined shafts with a propeller?
The cones center the propeller on the shaft as they are forced toward each other by the
tightening of the retaining nut.
How is feathering accomplished on a constant speed counterweight propeller?
Releasing governor oil pressure allows the counterweights and feathering spring to move the
blades to the feathered position.
What types of systems are used for deicing propellers?
Fluid or electrical deicing systems
What is the purpose of a slinger ring on some propeller installations?
Propeller deicing fluid is ejected from a stationary nozzle on the engine into a scoop attached to
the rear of the propeller assembly. The U-shaped channel is called the slinger ring. The fluid
under pressure of centrifugal force is transferred through a tube to the propeller blades.
