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Homework #3: Propellers
Terms in this set (17)
The distance the aircraft would move with one full propeller rotation
The distance the propeller moves when including slipage
The loss of propeller efficiency
What is the most effective propeller angle of attack for takeoff?
Blade angle/ Blade pitch
The angle between the firewall vertical plane and the chord line
Angle of attack
The angle between the relative wind and the chord line
A feathered propeller will have a blade angle of approximately ______ degrees?
List and describe 4 forces which act on an operating propeller.
Centrifugal Twisting - throws the rotating propeller blades away from the hub
Centrifugal Acceleration - forces the blades toward a low blade angle
Aerodynamic Twisting - turns the blades to a higher blade angle
Torque Bending - bends the propeller blades in the direction opposite of rotation
Thrust Bending - bends the propeller blades forward as the aircraft moves through the air
Viewing the cross-section diagram of a propeller, identify the blade face and blade back.
Blade back faces forward and Blade face faces the pilot
On light aircraft, where does the force to operate the propeller pitch changing mechanism come from?
As we change the prop lever, it causes the flyweights to move and allows or doesn't allow the oil to flow into the hub of the propeller. The pressure from the oil then changes the angle of the propeller.
Briefly outline the difference in operation for a light single engine and multi-engine aircraft propeller system.
Single engine: non-feathering, constant speed
Multi engine: feathering, constant speed
Is the lowest blade angle near the shank or the tip? Why? Was it built that way?
Near the tip. To ensure equal thrust across the entire propeller.
With a fixed RPM, does the propeller blade angle increase or decrease as airspeed increases? What about the angle of attack?
The blade angle increases as airspeed increases and the angle of attack remains the same
What is the difference between static and dynamic balancing?
Static is a propeller suspended by a drawstring. Dynamic is an electrical machine with vibration analysis of the aircraft.
What are the differences between a two-position and a ground adjustable propeller?
Ground adjustable operates as a fixed pitch propeller and can only be changed when the propeller is not turning.
Two-position controllable propeller allows a change of blade angle or pitch while the propeller is rotating.
What component in the governor opposes the force of the speeder spring?
What forces are used to feather a propeller?
The flyweights moved by the centrifugal force.
Sets found in the same folder
Homework #1: Engines
Homework #2: Engine Lubrication
Homework #4: Fuel Systems
Homework #5: Power Management
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