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2ND SEM PRELIMS > AMT 126 Introduction to Propellers > Flashcards

AMT 126 Introduction to Propellers Flashcards

1
Q

It is the cutting edge that slices into the air.

A

Leading Edge

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2
Q

permits a propeller to be mounted on the engine crankshaft or to a reduction gear assembly

A

Hub bore

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3
Q

Technologies relating to a Propeller

A

Chord line, Blade Angle, Plane of Rotation, Axis of Rotation, Angle of Attack, Blade Station, Blade Twist

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4
Q

Rotation around a fixed axis

A

Axis of Rotation

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5
Q

As the _____ cuts the air, air flows over the blade face and the camber side.

A

Leading Edge

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6
Q

The portion of a propeller blade that is nearest the hub.

A

Blade Shank/ Blade Root

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7
Q

It is the angle formed by the chord line of the blade and the relative wind.

A

Angle of Attack

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8
Q

An imaginary straight line drawn between the leading edge and the trailing edge of an airfoil, in the direction of the normal airflow

A

Chord line

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9
Q

It is the outer end of the blade farthest from the hub.

A

Blade Tip

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10
Q

are those mounted on the upstream end of a drive shaft in front of the supporting structure.

A

Tractor propeller

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11
Q

The edge from which the air leaves the blade.

A

Trailing edge

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12
Q

Is the angle between the chord of the blade and the plane of rotation and is measured at a specific point along the length of the blade.

A

Blade Angle

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13
Q

Most aircraft are equipped with this type of propeller.

A

Tractor propeller

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14
Q

It is the surface of the propeller blade that correspond to the lower surface of an airfoil or flat side.

A

Blade Face

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15
Q

It is an airfoil-shaped attachment made of thin sheets of metal, plastic, or composite material.

A

Blade Cuffs

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16
Q

The _____ of propeller comes in all types of propellers

A

Tractor type

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17
Q

It is the curved surface of the airfoil

A

Blade Back/ Thrust Face

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18
Q

refers to a changing chord line from the blade root to the tip.

A

Blade Twist

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19
Q

Rocks, gravel, and small objects dislodged by the wheels are quite often thrown or drawn into a _____.

A

Pusher propeller

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20
Q

A major advantage of the _____ is that lower stresses are induced in the propeller as it rotates in relatively undisturbed air.

A

Tractor propeller

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21
Q

is an imaginary plane perpendicular to the shaft.

A

Plane of Rotation

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22
Q

Twisting a rotor blade causes it to produce a more even amount of lift along its span.

A

Blade twist

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23
Q

It will transform the round shank into an airfoil section

A

Blade Cuffs

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24
Q

are those mounted on the downstream end of a drive shaft behind the supporting structure.

A

Pusher propeller

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25
Q

is a rotating hub with helical radial blades converting shaft power into aerodynamic thrust.

A

Propeller

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26
Q

is mounted above and behind the wings to prevent such damage.

A

Pusher Propellers

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27
Q

central position of propeller carried on drive-shaft

A

Hub

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28
Q

Types of Propeller Connection

A

Tractor propeller, Pusher Propeller

29
Q

It is the plane that contains the circle in which the blades rotate

A

Plane of Rotation

30
Q

are rotating airfoils

31
Q

are subject to more damage than tractor propellers.

A

Pusher propellers

32
Q

are rotating airfoils, it converts the rotating power of the engine into thrust which propels the airplane through the air.

33
Q

simply a reference position on a propeller blade that is a specified distance from the center of the hub.

A

Blade station

34
Q

These are two types of Propeller Connection

A

Tractor propeller and Pusher propeller

35
Q

___, ___, and ____ dislodged by the wheels are quite often thrown or drawn into a pusher propeller.

A

Rocks, gravel, and small objects

36
Q

Basic parts of a propeller:

A

hub, hub bore, blade shank/ blade root, blade tip, blade back/ thrust face, blade face, leading edge, trailing edge, blade cuffs

37
Q

It is a critical statistic that directly affects performance.

A

Propeller Slip

38
Q

Hardwood such as ____, ____, ____, ____, _____, _____ and ____ possess the flexibility and strength required for a propeller used on the low horse power engines of small aircraft.

A

birch, maple, mahogany, cherry, oak, black walnut, and several others.

39
Q

also known as blade pitch

A

Blade Angle

40
Q

is the distance in inches, which the propeller would screw through the air in one revolution if there were no slippage.

A

Propeller pitch

41
Q

It is more desirable than wood because it allows thinner, more efficient airfoils to be constructed without sacrificing structural strength

A

Aluminum Alloy

42
Q

Less maintenance than wood propellers.

A

Aluminum alloy

43
Q

is the distance traveled of the propeller in one revolution.

A

Propeller pitch

44
Q

Materials used for different types of propellers:

A

Wood, Aluminum Alloy, Steel, Composite Material

45
Q

Theoretical distance a propeller should advance in one revolution

A

Geometric Pitch

46
Q

moderate travel distance-moderate speed = how many knots, rpm, and in.

A

259 knots, 2,500 rpm, 40 in.

47
Q

Frequent damage such as small nicks and upsets are easily dressed out with a file, maybe restored to an approved blade angle by certified propeller repair stations.

A

Aluminum Alloy

48
Q

Geometric Pitch - Effective pitch =

A

Propeller Slip

49
Q

It allows it to absorb engine vibration to a large degree and does not support resonant vibration they are susceptible to damage from gravel and debris during ground operation.

50
Q

Greater travel distance-very high speed = how many knots, rpm, and in.

A

389 knots, 2,500 rpm, 60 in.

51
Q

it is the actual distance a propeller advances in one revolution in the air.

A

Effective Pitch

52
Q

along the length of a propeller blade compensates for differences in rotational speed and allows for a more even distribution of thrust along the blade.

A

The Variation in airfoil shape and blade angle

53
Q

___ such as birch, maple, mahogany, cherry, oak, black walnut and several others possess the flexibility and strength required for a propeller used on the low horse power engines of small aircraft.

A

Hardwood (wood)

54
Q

The difference between the propeller’s geometric pitch and the effective pitch.

A

Propeller Slip

55
Q

are all used for propeller construction.

A

Wood, Aluminum Alloy, Steel and Composite Materials

56
Q

Short travel distance-slow speed = how many knots, rpm, and in.

A

129 knots, 2,500 rpm, 20 in

57
Q

These propellers are light weight and extremely durable.

A

Composite Material

58
Q

The fibers most generally used are ___, ___, ___, ____ and _____ such as epoxy.

A

glass, graphite, aramid (Kevlar), aerospace-grade carbon fiber and matrix thermosetting resin

59
Q

Composite materials used in propeller manufacturing consist of two constituents: The ___ and The ___

A

The fiber and the matrix

60
Q

It usually starts by pulling carbon fiber socks over a low-density foam core, then inject resin with a vacuum pump and cure the blade after it’s put into a mold and pressure is applied.

A

Composite Propeller

61
Q

Because ___ is a heavy metal, steel blades are normally hollow consisting of steel sheets attached to a rib structure.

62
Q

most generally used are glass, graphite, aramid (Kevlar), aerospace-grade carbon ____ and matrix thermosetting such as epoxy.

A

The Fibers

63
Q

Absorbs vibration and are resilient, making them resistant to damage and corrosion

A

Composite Material

64
Q

After hours of curing, the blade is removed from the mold and refined to the precise standards.

A

Composite Propeller

65
Q

The hollow area is then filled with a foam material to help absorb vibration and maintain a rigid structure.

66
Q

The fibers most generally used are glass, graphite, aramid (Kevlar), aerospace-grade carbon fibers and matrix thermosetting such as _____

67
Q

used in propeller manufacturing consist of two constituents: The fiber and the matrix

A

Composite Materials (composite propeller)

68
Q

are found primarily on antique and older generation transport aircraft.

A

Steel propellers and blades

2ND SEM PRELIMS (10 decks)

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