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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
is a rotating hub with helical radial blades converting shaft power into aerodynamic thrust.
Propeller
26
is mounted above and behind the wings to prevent such damage.
Pusher Propellers
27
central position of propeller carried on drive-shaft
Hub
28
Types of Propeller Connection
Tractor propeller, Pusher Propeller
29
It is the plane that contains the circle in which the blades rotate
Plane of Rotation
30
are rotating airfoils
Propeller
31
are subject to more damage than tractor propellers.
Pusher propellers
32
are rotating airfoils, it converts the rotating power of the engine into thrust which propels the airplane through the air.
Propeller
33
simply a reference position on a propeller blade that is a specified distance from the center of the hub.
Blade station
34
These are two types of Propeller Connection
Tractor propeller and Pusher propeller
35
___, ___, and ____ dislodged by the wheels are quite often thrown or drawn into a pusher propeller.
Rocks, gravel, and small objects
36
Basic parts of a propeller:
hub, hub bore, blade shank/ blade root, blade tip, blade back/ thrust face, blade face, leading edge, trailing edge, blade cuffs
37
It is a critical statistic that directly affects performance.
Propeller Slip
38
Hardwood such as ____, ____, ____, ____, _____, _____ and ____ possess the flexibility and strength required for a propeller used on the low horse power engines of small aircraft.
birch, maple, mahogany, cherry, oak, black walnut, and several others.
39
also known as blade pitch
Blade Angle
40
is the distance in inches, which the propeller would screw through the air in one revolution if there were no slippage.
Propeller pitch
41
It is more desirable than wood because it allows thinner, more efficient airfoils to be constructed without sacrificing structural strength
Aluminum Alloy
42
Less maintenance than wood propellers.
Aluminum alloy
43
is the distance traveled of the propeller in one revolution.
Propeller pitch
44
Materials used for different types of propellers:
Wood, Aluminum Alloy, Steel, Composite Material
45
Theoretical distance a propeller should advance in one revolution
Geometric Pitch
46
moderate travel distance-moderate speed = how many knots, rpm, and in.
259 knots, 2,500 rpm, 40 in.
47
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.
Aluminum Alloy
48
Geometric Pitch - Effective pitch =
Propeller Slip
49
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.
Wood
50
Greater travel distance-very high speed = how many knots, rpm, and in.
389 knots, 2,500 rpm, 60 in.
51
it is the actual distance a propeller advances in one revolution in the air.
Effective Pitch
52
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.
The Variation in airfoil shape and blade angle
53
___ 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.
Hardwood (wood)
54
The difference between the propeller's geometric pitch and the effective pitch.
Propeller Slip
55
are all used for propeller construction.
Wood, Aluminum Alloy, Steel and Composite Materials
56
Short travel distance-slow speed = how many knots, rpm, and in.
129 knots, 2,500 rpm, 20 in
57
These propellers are light weight and extremely durable.
Composite Material
58
The fibers most generally used are ___, ___, ___, ____ and _____ such as epoxy.
glass, graphite, aramid (Kevlar), aerospace-grade carbon fiber and matrix thermosetting resin
59
Composite materials used in propeller manufacturing consist of two constituents: The ___ and The ___
The fiber and the matrix
60
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.
Composite Propeller
61
Because ___ is a heavy metal, steel blades are normally hollow consisting of steel sheets attached to a rib structure.
Steel
62
most generally used are glass, graphite, aramid (Kevlar), aerospace-grade carbon ____ and matrix thermosetting such as epoxy.
The Fibers
63
Absorbs vibration and are resilient, making them resistant to damage and corrosion
Composite Material
64
After hours of curing, the blade is removed from the mold and refined to the precise standards.
Composite Propeller
65
The hollow area is then filled with a foam material to help absorb vibration and maintain a rigid structure.
Steel
66
The fibers most generally used are glass, graphite, aramid (Kevlar), aerospace-grade carbon fibers and matrix thermosetting such as _____
Epoxy
67
used in propeller manufacturing consist of two constituents: The fiber and the matrix
Composite Materials (composite propeller)
68
are found primarily on antique and older generation transport aircraft.
Steel propellers and blades

2ND SEM PRELIMS (10 decks)

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