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M17 Propeller > Construction > Flashcards

Construction Flashcards

1
Q

Most common wood used in wooden propeller construction

A

Birch

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2
Q

How many laminates bonded with aero glue

A

5

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3
Q

What 3 materials is a metal spar made from

A

Titanium , aluminium or stainless steel

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4
Q

How is composite propller filled with

A

Low density foam or honeycomb

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5
Q

What’s the shell made of in a composite propeller

A

Fibreglass , kevlar , carbon fibre

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6
Q

What paint used for composite propellers

A

Polyeurothen paint

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7
Q

Protective parts of composite constitute

A

Heating element & metal guard

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8
Q

Why is wooden propeller left to rest for one week

A

Even moisture distribution

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9
Q

How are aluminium propellers polished

A

By machine

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10
Q

How are alluminium propeller shaped

A

Master blade

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11
Q

what’s the 2 final processes of aluminium propeller construction

A

Balanced & Anodised

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12
Q

What is the name of the wooden propeller after rested for a week

A

Propeller white

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13
Q

Why do we fabric sheath

A

Added strength

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14
Q

How are ground adjustable propeller blade angle changed

A

Only on ground

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15
Q

In a ground adjustable propeller what’s the blade angle range

A

7-15

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16
Q

How is blade angle checked

A

Propeller protractor at master reference station

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17
Q

Variation between blades

A

Max 0.1 degrees

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18
Q

Max desired blade angle

A

Max 0.1 degrees of desired blade angle

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19
Q

What does controllable propeller pitch change mechanism allow you to do

A

Pilot can change pitch of propeller during flight

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20
Q

What position in the propeller pitch change mechanism

A

Two position selector or variable pitch within min and max setting

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21
Q

Two aircraft controls

A

Throttle control (hg) & propeller control

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22
Q

How is constant speeding propeller designed in regards to pitch

A

Change blade pitch to allow it to maintain constant RPM

23
Q

What does a constant speeding propeller use

A

Constant speed unit or Governor

24
Q

How is constant speed unit controlled

A

Electrically controlled

25
Q

What principle does constant speed unit work on

A

Centrifugal force

26
Q

What spring and weights does a constant speed unit use

A

Speeder spring & set of fly weights

27
Q

What is tipping material

A

Brass , stainless steel , Monel and terneplate

28
Q

What are water drains for

A

Allows wood to breathe

3 #60 3/16 deep holes in tip

29
Q

How is metal tipping secured

A

Cooper rivets

30
Q

What does polyeurthene do

A

Provide mechanical and ultra violet protection

31
Q

What do we use plastic instead of

A

Sheathing

32
Q

How are steel propellers made

A

Hollow or solid

33
Q

How are hollow metal propellers made

A

Folded sheet welded over ribs

34
Q

What are hollow metal propellers filled with

A

Foam filled to dampen vibration

35
Q

Where is the propeller master refrence measured from

A

Distance measured from centre of rotation

36
Q

Master reference for fixed

A

75%

37
Q

Master reference for variable rotor

A

50-75%

38
Q

What does the dome assembly encase

A

Pitch change mechanism

39
Q

Fixed pitch propeller optimum performance

A

200kw

40
Q

Fixed pitch propeller speed

A

250km/h

41
Q

Why is a fixed pitch propeller favourable

A

Production and maintenance costs

42
Q

What’s the best condition for fixed pitch propeller and the optimum AoA

A

Cruise condition and 4 degrees

43
Q

What’s a bad thing about fixed pitch propellers in regards to the pilot

A

Pilot intensive as they have to keep checking parameters

44
Q

Where is blade angle adjusted on ground adjustable propeller

A

On ground

45
Q

Ground adjustable propeller blade angle

A

7-15 degrees

46
Q

What’s the two aircraft control

A

Throttle and propeller

47
Q

What does throttle do

A

Regulates power output on manifold pressure gauge

48
Q

What does propeller control do

A

Regulates engine RPM & propeller RPM

49
Q

What is low propeller pitch used for

A

Climb

50
Q

What is high propeller pitch used for

A

Cruise

51
Q

Advantage of constant speed propeller

A

Blade angle reduces torque, also this increases rpm/airspeed

52
Q

When does a spinner need to be inspected

A

Regularly due to high aerodynamic loads

53
Q

Why is there limited repairs on a spinner cone

A

Because any cracks are foundthey need to be replaced

54
Q

What’s a blank

A

5 layers of wood laid down and glued together

M17 Propeller (7 decks)

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