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Propellers Review > First Part of Review > Flashcards

First Part of Review Flashcards

1
Q

What is the purpose of the Propeller?

A

Converts BHP to thrust horsepower

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2
Q

What is Geometric Pitch?

A

Theoretically how far the propeller should travel in one revolution through a solid

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3
Q

What is Effective Pitch?

A

Actual distance the propeller travels in one revolution through the air

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4
Q

What is slip?

A

The difference between Geometric pitch and Effective Pitch

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5
Q

What is the blade angle of a climb prop?

A

2o

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6
Q

What is the blade angle of a cruise prop?

A

4o

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7
Q

What is the blade angle of a Standard propeller?

A

3o

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8
Q

Where do blade stations start?

A

Blade stations start at the centre of the hub

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9
Q

Which is the strongest force acting on a propeller?

A

Centrifugal Force

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10
Q

Which force bends propeller forward?

A

Thrust bending force

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11
Q

What type of wood do we use on wooden propellers?

A

Hardwood, laminating the wood

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12
Q

What do laminations prevent?

A

Warpage

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13
Q

What kind of coating can you put on wooden props to protect them?

A

Varnish and Armour Coating

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14
Q

How do you store wooden propellers and why?

A

Horizontally to allow even distribution of moisture

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15
Q

What type of protection can you put on the outer tip of the propeller?

A

Erosion shield and fabric covering

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16
Q

What must there be on the erosion shield to prevent moisture from building up?

A

Drain holes

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17
Q

What is the advantage of the Scimitar Sweptback propeller?

A
  • Reduces tip vorteces and drag
  • Higher speed
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18
Q

What are the Advantages and Disadvantages of Aluminum Propellers?

A

ADV

  • Easier to maintain
  • Can be re-pitched/twisted

DIS

  • Heavier
  • Vibration
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19
Q

How do we prevent corrosion on aluminum propellers at the manufacturing level?

A

Allodyne: Soak Prop in Chemical

Anodize: Electrochemocal treatment

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20
Q

What type of protection can we put on the leading edge of a propeller to prevent abrasion protection?

A

Nickel/Stainless Steel leading edge shield

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21
Q

What position should the propellers be when the engine is shutdown?

A

Coarse pitch

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22
Q

Why should the props be in coarse pitch on engine shutdown?

A

So the oil is all in the engine and the cylinder is protected

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23
Q

What permits oil to flow to/from the cylinder and engine when using the HSTPP?

A

Three way selector valve

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24
Q

What causes prop to go into coarse pitch on HSTPP?

A

Counterweights pulling out, oil is directed back to the sump

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25
Q

What causes prop to go into fine pitch on the HSTPP?

A

Oil pressure caused by cylinder going forward and counterweights pulling in

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26
Q

How are prop blade angles adjusted in the field?

A

By adjusting stop nuts on the index pin

27
Q

What other certification do you need when you do work on a variable pitch propeller?

A

Dual inspection (because propeller control is being tampered with)

28
Q

When you do work on a variable pitch propeller, where do you record the work?

A

Journey log, prop logbook, airframe logbook

29
Q

What would the Red ARC mean on the tachometer?

A

Resonant frequency range, high chance of damaging vibrations

30
Q

When setting pitch, what do you look at?

A

Blade Index Number

31
Q

What do you zero the protractor to when measuring blade angle?

A

Zero to plane of rotation on the propeller

32
Q

What position should the levers be in on takeoff?

A
  • Throttle: Full fwd (Max pwr)
  • Mixture: Full fwd (Max Fuel Flow)
  • Propeller: Full fwd (Max RPM)
33
Q

What are the limitations when flying at cruise in terms of indication?

A

Make sure manifold pressure doesn’t get too high for the RPM setting

34
Q

What does the prop lever control?

A

Speeder spring

35
Q

What happens in CLIMB/CRUISE?

A
  • Prop Lever AFT
  • Releases tension on speeder spring (allowing flyweights to move)
36
Q

What happens in UNDERSPEED CONDITION?

A
  • Flyweights move inward
  • Releasing oil from prop hub (sending it back to engine sump)
37
Q

What happens in OVERSPEED CONDITION?

A
  • Flyweights move outwards
  • Oil flows to hub and increases blade pitch to reduce RPM
38
Q

How is the accumulator used with the hartzell or McCauley feathering propellers to assist the propeller in flight?

A

When the pilot moves the propeller control to feather, the check valve control is moved off and the check valve is swated, trapping the oil under pressure in the accumulator

39
Q

An aircraft with a constant-speed propeller system, what gauges will the pilot use to control throttle setting and the propeller RPM?

A

Throttle: MAP

Prop RPM: Tachometer

40
Q

What component is used to make pitch changes to the propeller blades on a Hamilton Standard Hydromatic Propeller?

A

When the dome assembly is threaded into the prop hub, oil press acts on the piston to move it fore and aft within the dome. As the piston moves, a set of cam rollers mounted to the piston engage the rotating cam which causes it to turn within the fixed cam

41
Q

How does the pilot feather the propeller on a hydromatic propeller?

A

By repressing a feathering button in the cockpit

42
Q

Three main functions of a governor in constant speed

A
  • Boosts engine oil press
    • Senses rotational speed of engine
      • controls amount/flow of oil
43
Q

What actions take place when the pilot selects fine pitch on the controllable pitch (two position) propeller when the engine is running?

A

Oil is used to move the propeller blades to a fine pitch

44
Q

What is the governor’s function during the feathering process on a Hamilton Standard Hydromatic Propeller?

A

High Press transfer valve that disables the governor constant-speed functions when the prop is feathered or unfeathered

45
Q

What happens when the props reach fully feathered position?

A

the cutout switch automatically stops oil press delivery

46
Q

What happens in ON SPEED condition?

A

No oil is moved in either direction

47
Q

Can we control the oil press output of the governor?

A

Oil press output is automatically controlled by oil Pressure Relief Valve (PRV)

48
Q

If prop control in flight deck were to break, what would happen?

A

Spring pushes prop to fine

49
Q

What drives prop to coarse pitch/?

A

Spring press. in the prob hub and counterweights

50
Q

Hartzell and McCauley Abbreviation (gonna use this to save time)

A

H&M

51
Q

In the H&M system, how does the governing system work?

A

Counterweight pushes blades to coarse pitch

Oil press pushes blades to fine

52
Q

How do feathering capable props work?

A
  • Oil press to fine pitch
  • Centrifugal force to coarse
53
Q

How do non-feathering capable props work?

A

Oil press to coarse

Centrifugal force to fine

54
Q

For feathering capable propellers, which prop position do you shut down engines in?

A

Fine pitch

55
Q

What is the sequence of events that take place when the pilot selects feather?

A
  1. Governor overrides speeder spring and flyweights
  2. Pilot valve is lifted, allows oil to drain
56
Q

What does the accumulator do?

A

Gives you a pressure boost to take the propeller out of feather

57
Q

What should you do on engine shutdown with a feathering capable system?

A

Select feather and that would trap oil press in the accumulator

58
Q

What is the abbreviation i’m gonna use for Hamilton Standard Hydromatic Propellers?

A

HSHP

59
Q

Does the HSHP have a governor?

A

yes

60
Q

What is unique about the blades of hydromatic propellers?

A

Butt of each blade consists of a sector gear that meshes with the pitch changing gear in the dome assembly

61
Q

What does the dome(Pitch change assy) consist of in the HSHP?

A

Piston, rotating cam, fixed cam

62
Q

What happens when the piston moves in the HSHP?

A

The piston movement moves a set of cam rollers mounted to the piston engage the rotating cam which causes it to turn within the fixed cam

63
Q

What does the HP transfer valve do in the HSHP?

A

Disables governors constant speed functions when the propeller is feathered or unfeathered

Propellers Review (2 decks)

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