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Propellers Midterm > Midterm > Flashcards

Midterm Flashcards

1
Q

A device for converting engine horsepower into usable thrust

A

propeller

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2
Q

A propeller used on light aircraft, whose blade angles cannot be changed

A

fixed pitch propeller

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3
Q

a propeller whose pitch can be changed in flight by the pilot’s control lever or switch

A

controllable-pitch propeller

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4
Q

the angle between the blade section chord line and the plane of rotation of the propeller

A

blade angle

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5
Q

a system which uses a governor to adjust the propeller blade angle maintain a selected RPM

A

constant-speed propeller system

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6
Q

the rotation of the propeller blades to an angle of about 90 degrees which will eliminate the drag of a windmilling propeller

A

feather

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7
Q

rotating of the propeller blades to a negative angle to produce a braking or reversing thrust

A

reversing

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8
Q

one arm of a propeller from the hub to the tip

A

blade

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9
Q

the central portion of a propeller which is fitted to the engine crankshaft and carries the blades

A

hub

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10
Q

forward edge of the propeller blade

A

leading edge

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11
Q

the curved side of a propeller airfoil section the can be seen while standing in front of the airplane

A

back

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12
Q

the plane in which the propeller rotates, 90 degrees to the crankshaft centerline

A

plane of rotation

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13
Q

the imaginary line which extends from the leading edge to the trailing edge of a blade airfoil section

A

chord line

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14
Q

a distance from the center of the propeller hub measured in inches

A

blade station

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15
Q

the same as geometric pitch. Often used interchangeably with blade angle

A

pitch

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16
Q

the twist in a propeller blade along its length

A

pitch distribution

17
Q

a propeller which can be adjusted on the ground to change the blade angles

A

ground adjustable propeller

18
Q

the propeller control device in a constant-speed system

A

governor

19
Q

What is the smallest division that can be read with a propeller protactor?

A

tenths of a degree

20
Q

What should be the condition of the cockpit controls before working near a propeller?

A

Magneto switch is off and key is removed from the switch. Mixture control is in the idle cutoff position and master switch is in the off position.

21
Q

Which FAR defines the different classes of maintenance for the propeller systems?

A

FAR Part 43

22
Q

What information is required to be on the hub or clade butt of a propeller?

A

Builder’s name, model designation, serial number, type certificate number, and production certificate number

23
Q

What is the minimum ground clearance for the propeller on a tricycle-geared aircraft?

A

7 inches

24
Q

the angle between the chord line of a propeller blade section and the relative wind

A

angle of attack

25
Q

the force which tries to pull the blades of the hub

A

centrifugal force

26
Q

force that tends to bend the propeller blades forward at the tips

A

thrust bending force

27
Q

force which tends to bend the propeller blade back in the direction opposite to the direction of rotation

A

torque bending force

28
Q

force that tends to increase the propeller blade angle

A

aerodynamic twisting moment

29
Q

force that tends to decrease blade angle and opposes aerodynamic twisting moment

A

centrifugal twisting moment

30
Q

the rpm range at which destructive harmonic vibrations exist

A

critical range

31
Q

the theoretical distance that an aircraft will move forward in one revolution of the propeller

A

geometric pitch

32
Q

the distance forward that an aircraft actually moves in one revolution of the propeller

A

effective pitch

33
Q

the difference between geometric and effective pitch

A

slip

34
Q

a crankshaft whose propeller mounting surface forms a flat plate 90 degrees to the shaft centerline, med hp engine

A

flanged

35
Q

a cylindrical-shaped crankshaft extension which has splines on its surface to prevent propeller rotation on the shaft, high hp engines

A

splined

36
Q

a crankshaft design whose propeller-mounting surface tapers to a smaller diameter and acts like a cone seating surface, low hp engines

A

tapered

Propellers Midterm (1 decks)

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