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M17 > 17.2 > Flashcards

17.2 Flashcards

1
Q

Propellers are categorised in 3 types of materials

A

Wooden
Composite
Metal (aluminium alloy or steel)

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2
Q

Which wooden propeller is the most common

A

Birch

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3
Q

How many layers of wood laid down when glued together form a blank

A

5

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4
Q

Most wooden propellers are finished with

A
  • natural wood finish
  • grey or black plastic coating
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5
Q

The blank is roughly shaped and allowed to rest for a week to allow for what

A

Equal distribution of moisture through all the layers (known as white)

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6
Q

Why is the cotton fabric doped

A

Protect weather and UV deterioration

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7
Q

How is the metal tipping secured to the blade

A
  • By countersunk screws (at thick blade section)
  • copper rivets (near the tip)
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8
Q

Why are small holes drilled in each propeller tip

A
  • allow to release moisture
  • wood to breathe
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9
Q

What is a alternate reinforcing method instead of doped cotton fabric before metal tipping is applied

A

Plastic (for added protection and strength)

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10
Q

What is the final coating of polyurethane paint for

A

Mechanical and Uv ray protection

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11
Q

How is the wooden propeller mounted to engine

A
  • splined
  • tapered
  • forged steel hub
  • bolted
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12
Q

Are composite propellers stronger than metal

A

Yes

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13
Q

What is the problem with composite propellers

A

Damage can be difficult to detect

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14
Q

What shields are use to protect leading edge from impact damage

A

Nickel or stainless steel erosion shields

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15
Q

What is used to limit lightning strike damage

A

Metal foil mesh

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16
Q

The composite propellers spar absorbs what forces

A

Centrifugal forces and bending loads

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17
Q

The composite propellers spar absorbs what forces

A

Centrifugal forces and bending loads

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18
Q

Construction of composite blades without metal spar comprises of what

A

2 carbon fibre components

19
Q

The hollow centre construction in composite blades without metal spar is filled with what

A

Polyurethane foam

20
Q

Metal propellers are constructed from what

A
  • Aluminium alloy
  • steel
21
Q

Is aluminium alloy or wooden propeller more durable

A

Aluminium alloy

22
Q

How is the lead wool retained in its place in a composite blade without metal spar

A

By a rubber plug

23
Q

What is the most common blade surface finish

A

Anodising

24
Q

Steel propeller blades are typically hollow to keep weight to a minimum (T or F)

A

True

25
Q

How is the propeller blade angle measured from root to tip

A

Blade protractor

26
Q

The master station is also a reference point as to where most of the thrust of the blade is produced (T or F)

A

True

27
Q

When RPM increases what happens to AOA

A

Reduce AOA

28
Q

Controllable pitch propeller has 2 controls which are

A
  • Throttle control
  • propeller control
29
Q

What is the most popular controllable pitch propeller system design used today

A

Beech-Roby

30
Q

How is the pitch change initiated in the cockpit

A

Crank handle which directly drives a pinion gear

31
Q

What is a constant speed propeller

A

automatically change blade pitch to allow it to maintain constant RPM

32
Q

What are the most common propeller drive shaft types

A
  • Tapered
  • Splined
  • Flanged
33
Q

Where are tapered shafts usually found

A
  • small, older, low powered piston engine
34
Q

If aircraft is in under speed mode what blade pitch is used

A

Fine pitch

35
Q

The propeller shaft of high output radial engines is generally splined (T or F)

A

True

36
Q

Where are flanged propeller shafts used

A
  • modern reciprocating and turboprop engines
37
Q

What is the reason for spinner installation

A
  • mechanical protection for hub
  • aesthetic reasons
38
Q

What is the propeller spinner usually manufactured from

A
  • spun aluminium alloy
  • glass fibre composites
39
Q

Why do some flanges have index pins

A

Can be only installed in one position

40
Q

Dynamic load on the spinner is extremely high

A

True

41
Q

What should you ensure when installing spinner

A
  • no noticeable wobble is identified
42
Q

How is constant speeding propeller accomplished

A

By using a constant speed unit or a governor

43
Q

What is the propeller spinner attached to

A

Spinner backplate (spinner bulkhead)

44
Q

How is a spinner repaired

A

Stop drilling

M17 (6 decks)

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