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Rotary Wing > Part 2 > Flashcards

Part 2 Flashcards

1
Q

What do you call the vertical etches that intermesh with transmission gears on the mast?

A

Splines

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2
Q

Where is the mast usually located, relative to the aircraft’s weight and balance?

A

Within the C of G

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3
Q

_________ is the twisting force caused by counter-torque that acts on the mast

A

Torsion

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4
Q

______________ is the force caused by the weight of the Rotor Hub assembly

A

Compression

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5
Q

The mast is a critical item, and in some instances has a ________ _______

A

Finite Life

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6
Q

What is this device called?

A

Stabilizer bar

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7
Q

________ ______ is the angle between the chord line of the blade and a reference plane

A

Pitch Angle

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8
Q

_______ is the distance from the leading edge to the trailing edge

A
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9
Q

Lift is ___________ to relative wind

A

Perpendicular

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10
Q

Drag is _________ to relative wind and __________ to lift

A

Parallel,Perpendicular

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11
Q

The preset angle for airplane wings is called the…?

A

Angle of incidence

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12
Q

What is the universal letter for RPM?

A

‘N’

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13
Q

What is Nr?

A

Main rotor RPM

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14
Q

____

A
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15
Q

_______ ________ is a condition that can cause damage to the tail on longer bladed helicopters

A

Blade Droop

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16
Q

Centrifugal force depends on which two factors?

A

Weight of the blade and its velocity

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17
Q

Coning is caused by the _______ of the helicopter

A

Weight

18
Q

If the blades are out of track, what do you adjust?

A

Pitch links

19
Q

The rotor speed ________ from the blade outwards

A

Increases

20
Q

In a no-wind hover, lyft is ____________ over the entire rotor disc

A

Symmetrical

21
Q

In forward flight, the advancing half of the disc produces ______ lift than the retreating half, causing _______________ ___ _______

A

More, Dissymmetry of lift

22
Q

Helicopter forward speed is limited because of…

A

Dissymmetry of lift

23
Q

To compensate for dissymmetry of lift, what can helicopter blades do?

A

Flap, lead and lag

24
Q

Why can’t heliciopters fly fast?

A

Because of dissymmetry of lift

25
Q

Why does the advancing side get more lift?

A

Greater relative wind

26
Q

How do you counteract dissymmetry of lift?

A

Flapping hinge

27
Q

According to Mr.Baugh, “When the blade flaps up….?

A

…it Spills some lift”

28
Q

Blade Lead/lag is accomplished through a ________ ______

A

Vertical Hinge

29
Q

In a fully ariculated main rotor head, there are ______ axis of rotation

A

Three

30
Q

The Speed change in an object getting smaller is called __________ ________

A

Coreolis effect

31
Q

Another name for the Coreolis effect is the ________________ ____ ___________ _______________

A

Conservation of angular momentum

32
Q

Coreolis Effect is the result of ________ __________

A

Blade Flapping

33
Q

On a semi-rigid helicopter, the blades are kept below the C of G to prevent the coreolis effect, this design is called the __________ ________

A

Underslung Design

34
Q

_______ ___________ prevents droop when blades are at rest

A

Droop Restraints

35
Q

What does the grip do?

A

Holds on to the blade through the blade bolt

36
Q

What is the purpose of the yoke?

A

Carries the load of the blades

37
Q

Lead/Lag has to be __________

A

Dampened

38
Q

Which orientation is the flapping hinge?

A

Horizontal

39
Q

______ ___________ is dampening vibrations from blade lead/lag, flapping by using a mass

A

Mass Dampening

40
Q

Under normal conditions, with the stick trim off, is there artificial feel?

A

No, there isn’t any artificial feel

41
Q

Which component can also give you trim?

A

Magnetic brake

Rotary Wing (2 decks)

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