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M17 > 17.2* > Flashcards

17.2* Flashcards

1
Q

What do wooden propellers consist off?

A

Several (at least 5) layers of wood bonded with a waterproof resin glue - aero glue

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2
Q

What is the most common wood used?

A

Birth

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3
Q

What is the minimum amount of layers of wood to be laid down?

A

5 layers

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4
Q

On wooden props a cotton fabric sheathing is applied where?

A

To 12-15 inches of the outer tip to reinforce the strength of the tip

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5
Q

In a composite prop where is the heating boot?

A

On the inner 1/3;

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6
Q

On a composite prop what is the surface protected by?

A

By a coat of conducting polyurethane paint that protects against erosion and prevents the blade from becoming statically charged

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7
Q

On a composite props what is bonded to the leading edges?

A

Nickel or stainless steel erosion shields to protect from damage

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8
Q

What type of aircraft are metal propellers used on?

A

Engines with greater engine power

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9
Q

What are metal props constructed from?

A

Aluminium alloy or steel

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10
Q

What is the construction of steel blades normally, and what is the advantage of this?

A

Steel blades are normally on a hollow construction and foam filled
. This reduces the weight

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11
Q

What is the most common finishing process used in metal props?

A

Anodising

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12
Q

How can you measure the propeller master reference station?

A

A distance measured from the centre of rotation where all measurements are taken from

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13
Q

Where is the master reference point on a fixed pitch prop?

A

75% from the centre of rotation

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14
Q

Where is the master reference point on a variable pitch prop?

A

50- 75% from the centre of rotation

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15
Q

What is the propeller blade angle?

A

The angle between the blade chord line and the plane of rotation

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16
Q

What is the propeller face?

A

The flat thrust producing side of blade

17
Q

What is the propeller back?

A

The curved side of blade facing the flight

18
Q

What is the propeller base butt?

A

The base of prop blade where root ends

19
Q

Can you change the pitch on a fixed pitch prop?

A

No

20
Q

What power and speeds are fixed pitch props used in?

A

200kW (250hp) and region of 250km/h (160mph)

21
Q

For a fixed prop blade, the blade angle is set for its intended purpose. When would you need a fine vs coarse blade angle?

A

. Fine (low) = steep clim and towing
. Coarse (high) = cruising flight

22
Q

On a fixed pitch prop, when is maximum RPM a viable?

A

When the angle of attack is set too it’s optimum 4 degrees

23
Q

What are ground adjustable propellers designed for?

A

. Used on older aircraft of low - moderate performance. Blade angles can be adjusted on the ground to give the desired performance
. Take off - low/fine
. Cruise - high/coarse

24
Q

What is the angle range of ground adjustable props?

A

7-15 degrees

25
Q

What do controllable pitch propellers allow?

A

Allows the pilot to change to pitch of the blade in flight irrespective of flight operating conditions

26
Q

What are the two controls that a controllable pitch prop has?

A

. Throttle control - power output of engine
. Propeller control - regulate RPM of engine and prop. On tachometer

27
Q

What is a constant speed propeller?

A

Designed to automatically change the pitch of the prop blade to maintain a constant RPM

28
Q

What does a constant speed propeller need to control it?

A

A constant speed unit/ propeller governor

29
Q

What is the basic principle that constant speed units work on?

A

A centrifugal force with the use of a speeder spring and flyweights

30
Q

What is true for a tubroprop IAW with its speed band?

A

Most produce their maximum power in a narrow speed band

31
Q

What does a constant speed prop allow IAW with RPM?

A

The RPM is controlled automatically by the varying pitches of the propeller blades

32
Q

Why are spinners mounted?

A

For better aerodynamic reasons and as a mechanical protection for the blade hubs and aesthetic reasons

33
Q

What a spinners normally manufactured from and fitted by?

A

Manufactured in 1 piece from spun aluminium alloy or glass fibre composites and attached to the spinner backplate (spinner bulkhead)

34
Q

Dynamic loads on the spinner are so high, which causes cracks. What are the rules regarding this?

A

If there are cracks on the blade recess or in spinner mounting then have to be replaced. Repairs are limited

35
Q

What is the only method of repair allows on spinners?

A

Drooling to stop the crack is allowed - stop drilling

M17 (12 decks)

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