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Aircraft General Knowledge > Propeller Principles > Flashcards

Propeller Principles Flashcards

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1
Q

What drag acts 90 degrees to the axis of rotation on a propeller aircraft?

A

Torque.

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2
Q

What is the propeller disc?

A

The area in which the propeller rotates?

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3
Q

Whats the dome of a propeller called?

A

Spinner

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4
Q

Most propellers have approximately blank rpm.

A

1000

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5
Q

What is the component parallel to the rotational axis on a propeller aircraft?

A

Thrust.

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6
Q

• To preserve the same angle of attack along the whole length of the blade, the blade pitch angle must be progressively increased/decreased from root to tip.

A

Decreased.

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7
Q

In a variable pitches propeller, what angle is course?

A

Large angle.

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8
Q

In a variable pitches propeller, what angle is fine?

A

Small angle,

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9
Q

What is variable pitch propeller alpha range?

A

Flight range.

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10
Q

What is variable pitch propeller beta range?

A

Ground range

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11
Q

When would you put a propeller in feathered position?

A

Engine shut down.

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12
Q

When would you use reverse pitch on a variable pitch propeller?

A

Reverse thrust.

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13
Q

What does feathering do to a propeller?

A

Reduce drag.

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14
Q

What can you do to the prop leaver to feather the propeller?

A

Reduce it

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15
Q

When is a propeller on speed?

A

When propeller torque drag equals engine torque drag.

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16
Q

What is a propeller spinner susceptible to?

A

Icing,

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17
Q

What is a propeller driven by?

A

Engine torque (RPM)

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18
Q

What opposes engine torque on a propeller?

A

Torque drag.

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19
Q

The propeller is driven by Engine
Torque (RPM)
• Opposing this is Torque drag which
changes in magnitude with blade angle
• These forces are detected and balanced by the blank?

A

Constant speed unit.

20
Q

The centrifugal twisting moment in a propeller have a tendency to cause the blade to blank off.

A

Fine.

21
Q

An aerodynamic twisting moment atempts to blank off the propeller.

A

Course.

22
Q

When would propeller windmilling occur?

A

When the engine has failed.

23
Q

What controls the oil in a double Acting Variable Pitch Propeller?

A

Control speed unit.

24
Q

In a twin engined aircraft, what position does the spring want to move the propeller (Single Acting Variable Pitch Propeller)

A

Feathering.

25
Q

In a single engined aircraft, what position does the spring want to move the propeller (Single Acting Variable Pitch Propeller)

A

Fine.

26
Q

The centrifugal latch prevents the blades entering a
Blank condition during engine shut down under
normal operations on a propeller aircraft.

A

Feathered.

27
Q

As the csu moves up and the governor weights go out, what happens to the pitch of the propeller fins?

A

Coarser.

28
Q

CSU on Speed
•When propeller torque and engine
output are exactly matched the landed
valve shuts off the supply of high-
pressure blank into the valve chamber
• This creates a hydraulic blank which
holds the propeller at the selected
pitch angle.

A

Oil - Lock

29
Q

When under speed where do the governor weights move in a csu?

A

They move in.

30
Q

What is synchro phased condition on a propeller?

A

Pressure wave taking turns.

31
Q

The “slipstream effect” of a propeller is most prominent at… high/low airspeeds with a high/low power setting

A

Low speed with high power

32
Q

power lever is moved to the reverse position and the blades move from low pitch ( directly to/via high to )reverse pitch.

A

Directly to

33
Q

The main advantage of a constant speed propeller compared to a fixed pitch propeller is that a constant speed propeller…maintains its maximum propeller efficiency over a wider range of blanks.

A

Airspeeds.

34
Q

During cruising flight, when the throttle is pulled back on an aeroplane equipped with a constant speed-propeller, the propeller pitch automatically decreases/increases and the RPM increases/decreases/does nothing.

A

Decreases and does nothing

35
Q

One of the primary purposes of a propeller reduction gearing system is to…limit the x x x to a value below which efficient operation can be obtained.

A

Propeller rotation speed.

36
Q

On an aeroplane equipped with a manual feathering system the pilot can feather the propeller by…pulling the propeller control lever forwards/rearwards.

A

Rearwards

37
Q

In the event of an engine failure during flight in a single-engine aeroplane not fitted with a feathering system, the blades of a constant speed propeller tend to move…towards the smallest/biggest blade angle by blank twisting moment and/or spring force.

A

Smallest - centrifugal

38
Q

The blade angle of a constant-speed propeller…increases / decreases with true air speed.

A

Increases

39
Q

An aircraft is performing a go-around having had a critical engine failure. Which of the following combinations gives the BIGGEST stress on the rudder? Forward/aft CG and 1/2slip/no slip

A

Aft and no slip

40
Q

Assuming the RPM and throttle levers are not altered, when TAS increases the blade angle of a constant speed propeller will… increase/decrease?

A

Increase

41
Q

A multi-engine piston aircraft both the propellers rotate clockwise as seen from the cockpit. In a go-around, one of the engines fails. Which of the following situations will most probably need the pilot to use full rudder deflection?

A

Tachometer

42
Q

A multi-engine piston aircraft both the propellers rotate clockwise as seen from the cockpit. In a go-around, one of the engines fails. Which of the following situations will most probably need the pilot to use full rudder deflection? Left/right failure with a left/right crosswind.

A

Left

43
Q

Consider two twin-engine airplanes:

Airplane 1 has clockwise-rotating propellers.
Airplane 2 has inward-rotating propellers.

If, on both airplanes, the left engine fails, which will give the largest yawing moment, and from which side will it be?

A

Airplane 1 will have the greatest yaw moment, and it will produce a yaw to the left.

44
Q

For take-off, the correct combination of propeller pitch (high/low), and propeller lever position (forward/aft) for a piston engine at brake release is…

A

Low / forward

45
Q

After an engine failure on a twin-engined aircraft, which of the following configurations will put the least strain on the rudder? Forward/aft CG and 1/2slip / no slip towards the OPERATIVE ENGINE.

A

Forward / 0.5 slip

46
Q

What direction do you pull the prop for feathering?

A

Rearwards

47
Q

One of the primary purposes of a propeller reduction gearing system is to…limit the propeller blank blank to a value below which efficient operation can be obtained.

A

Rotation speed

Aircraft General Knowledge (49 decks)

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