Piston 1 - Week 6
What happens to blade speed as you move closer to the propeller hub?
Blade speed reverses
Blade speed decreases
Blade speed increases
Blade speed is constant
How do we identify where damage is located on a blade
Using water lines, the distance from the center of the hub of the propeller
Using blade stations, the distance from the center of the hub of the propeller
Using blade stations, the distance from the tip of the propeller blade
Using fuselage stations,the distance from the center of the fuselage to the propeller
As the engine spins slower what will happen to the blade angle of attack?
The angle of attack will get bigger
The angle of attack will get smaller
The angle of attack will be the blade angle
The angle of attack will remain between 2 - 4 degrees
What kind of airfoils are used in a propeller?
Thinner high speed airfoils across the entire blade length
Thicker low speed airfoils across the entire blade length
Thinner high speed airfoils at the root, thicker low speed airfoils at the tip
Thicker low speed airfoils at the root, thinner high speed airfoils at the tip
The end design goal for a propeller is to do what?
Produce more thrust at the root and less thrust at the tip of the blade
Produce more noise at the root than at the tip of the blade
Produce a relatively constant amount of thrust along the entire blade length
Produce less thrust at the root and more thrust at the tip of the blade
What is the purpose of a "spinner"
To reduce drag around the propeller hub
To give bored people something to do
To dry lettuce after washing
To separate water from fuel before it gets to the engine
What is the difference between geometric pitch and effective pitch called?
Slip
Grip
Lossiness
The difference
What is propeller geometric pitch?
The distance in inches that the propeller will move forward in one revolution if the were moving through a solid with no loss of efficiency
The distance in centimeters that the propeller will move forward in one revolution if the were moving through a solid with no loss of efficiency
The distance in feet that the propeller will move forward in one revolution if the were moving through a solid with no loss of efficiency
The distance in inches that the propeller will move forward in one revolution if the were moving through a solid with 10% loss of efficiency
What is pointed to by "F" in the following diagram?
Blade face
Plane of rotation
Blade angle
Chord line
What is pointed to by "H" in the following diagram?
Chord line
Blade face
Leading edge
Plane of rotation
What is pointed to by "C" in the following diagram?
Blade back
Pale of rotation
Axis of rotation
Chord line
What is used to control a constant speed propeller?
Propeller slip rings
It is manually controlled by the pilot
The flight management system
Propeller governor
As the engine spins faster what will happen to the blade angle of attack?
The angle of attack will get bigger
The angle of attack will get smaller
The angle of attack will be the blade angle
The angle of attack will remain between 2 - 4 degrees
What does a propeller designer do to compensate for speed differences across the span of a propeller blade?
The angle of the blade will be maintained the same as you move towards the tip
The angle of the blade will decrease as you move towards the tip
The angle of attack for the blade will increase as you move towards the tip
The angle of the blade will increase as you move towards the tip
What is propeller effective pitch?
The actual distance in inches that the prop moves forward in one revolution
The distance in inches that the propeller will move forward in one revolution if the were moving through a solid with no loss of efficiency
The actual distance in feet that the prop moves forward in one revolution
The distance in feet that the propeller will move forward in one revolution if the were moving through a solid with no loss of efficiency
What is propeller slip?
The difference between effective pitch and blade angle of attack
The difference between blade angle and blade angle of attack
The difference between geometric and effective pitches
The difference between geometric pitch and blade angle
What is P-factor?
A yawing tendency due to different relative winds on the propeller blades because of high aircraft angle of attack
A rolling tendency due to different relative winds on the propeller blades because of high aircraft angle of attack
A yawing tendency due to different relative winds on the propeller blades because of low aircraft angle of attack
A rolling tendency due to different relative winds on the propeller blades because of low aircraft angle of attack
What happens to blade speed as you move further away from the propeller hub?
Blade speed increases
Blade speed is constant
Blade speed decreases
Blade speed reverses
What must you do to maintain thrust as the aircraft climbs?
Decrease blade angle or decrease propeller speed
Decrease blade angle or increase propeller speed
Increase blade angle or decrease propeller speed
Increase blade angle or increase propeller speed
What is pointed to by "A" in the following diagram?
Blade back
Plane of rotation
Chord line
Blade angle
What is pointed to by "E" in the following diagram?
Chord line
Blade face
Leading edge
Trailing edge
What is pointed to by "G" in the following diagram?
Chord line
Axis of rotation
Blade face
Blade back
What does a propeller governor do?
It generates air pressure to control propeller blade angle
If controls engine speed to maintain propeller thrust output
It generates hydraulic pressure to control propeller blade angle
It generates fuel pressure to control propeller blade angle
Which of the following does propeller thrust depend on?
Aircraft weight
The shape of the airfoil
Engine manifold pressure
Aircraft angle of attack
What is blade angle of attack?
The angle between the plane of rotation and the axis of rotation
The angle between the blade chord line and the relative wind
The angle between the leading edge and the plane of rotation
The angle between the relative wind and the axis of rotation
What is the most effective angle of attack for a propeller?
2 - 4 degrees
The same as the blade angle
4-10 degrees
10-15 degrees
When the aircraft is moving what will be the blade angle of attack?
2 - 4 degrees
The same as the blade angle
More than the blade angle
Less than the blade angle
What is the "twist" in a propeller blade called?
Ice protection
Speed compensation
Noise elimination
Pitch distribution
What holds a variable pitch propeller blade into the hub assembly?
Centrifugal force
Reverse flanges on the blade shank
Nuts and washers on the blade shank
Bolts through the hub or clamping rings
What is pointed to by "B" in the following diagram?
Blade face
Blade angle
Leading edge
Chord line
What is pointed to by "D" in the following diagram?
Chord line
Blade back
Plane of rotation
Blade face
What happens to a propeller as it's speed approaches the speed of sound
Thrust decreases as lift increases
Lift decreases and noise increases
Lift increases and noise decreases
Thrust increases as lift decreases
What happens with p-factor?
The downward going blade generates more lift and the upward going blade generates less lift which results in a pitching up motion
The downward going blade generates more lift and the upward going blade generates less lift which results in a right yawing motion
The top blade generates less lift and the bottom blade generates more lift which results in a pitching up motion
The downward going blade generates more lift and the upward going blade generates less lift which results in a left yawing motion
What is the purpose of the "twist" in a propeller blade?
To keep the angle of attack relatively constant across the blade length
To keep noise generation equally low across the width of the blade
To keep the blade angle relatively constant across the blade chord
To keep the angle of attack relatively constant across the blade chord
What determines the relative wind of a propeller blade?
The attitude of the aircraft through the air and the rotational motion of the propeller
The speed of the aircraft through the air and the blade angle of the propeller
The speed of the aircraft through the air and the rotational motion of the propeller
The rotational motion of the propeller and the dead/tail wind that the aircraft is experiencing
As the aircraft moves faster what will happen to the blade angle of attack?
The angle of attack will get bigger
The angle of attack will remain between 2 - 4 degrees
The angle of attack will get smaller
The angle of attack will be the blade angle
What is the purpose of a blade cuff?
To increase cooling air flow into the engine nacelle
To improve the looks of the propeller, the shank looks ugly
To improve performance by reducing blade drag
To increase the thrust created by the propeller
Which of the following does propeller thrust depend on?
Aircraft angle of attack
Aircraft speed
Engine manifold pressure
The blade speed through the air
When the aircraft is stationary what will be the blade angle of attack?
10-15 degrees
2 - 4 degrees
4-10 degrees
The same as the blade angle
At what speed will the typical fixed pitch propeller operate at it's optimal angle of attack?
Climb or descent
Climb & landing
Climb or cruise
Decent & climb
As the aircraft moves slower what will happen to the blade angle of attack?
The angle of attack will remain between 2 - 4 degrees
The angle of attack will be the blade angle
The angle of attack will get smaller
The angle of attack will get bigger
Which of the following does propeller thrust depend on?
Aircraft angle of attack
Engine manifold pressure
Aircraft speed
Blade angle of attack
If a propeller has a geometric pitch of 90 inches and a effective pitch 67 inches what is it's loss of efficiency in percent?
26
7
39
41
If a propeller has a geometric pitch of 84 inches and a effective pitch 69 inches how much is it slipping?
15
29
10
40
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