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SIFT Study > ARMY AVIATION INFO > Flashcards

ARMY AVIATION INFO Flashcards

1
Q

What is the typical structure of a helicopter (body of the craft) called?

A

The Fuselage

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2
Q

Why does a helicopter need a main rotor?

A

To generate thrust

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3
Q

What is the purpose of a tail rotor?

A

To counteract torque

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4
Q

Why does a single rotor helicopter need a tail rotor?

A

To balance out the effects of torque

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5
Q

On U.S model crafts, in what direction do the rotor blades conventionally spin?

A

Counter-Clockwise

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6
Q

The rotor blades usually spin counter-clockwise in which countries?

A

The U.S.A, U.K, and Germany

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7
Q

True or False: In a single main rotor helicopter, some of the power is used to counteract torque, rather than being used solely for lift.

A

True

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8
Q

True or False: In a tandem rotor helicopter, some of the power is used to counteract torque, rather than being used solely for lift.

A

False.

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9
Q

How many main rotors does a tandem rotor helicopter have?

A

Two

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10
Q

True of False: A tandem rotor helicopter has a secondary/tail rotor.

A

False

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11
Q

What is an advantage of the tandem rotor helicopter, in terms of torque and energy usage?

A

Each blade rotates counter to the other, meaning that torque is automatically offset.

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12
Q

Is the Chinook one of the fastest aircraft in existence? If so, how?

A

Yes. Because of its tandem rotors, all of the power from the Chinook’s engine can be used in lift.

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13
Q

On a Coaxial Rotor Helicopter, in which direction do the blades spin?

A

The two blades spin in opposite directions

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14
Q

How are the blades displayed on a Coaxial Rotor Helicopter?

A

One blade sits on top of the other, mounted to the same mast.

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15
Q

What is one thing that is reduced by a coaxial rotor?

A

Payload

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16
Q

What advantage does an aircraft have by reducing payload?

A

By reducing payload, you are allowed to carry greater cargo and have a higher passenger capacity.

17
Q

What are four aerodynamic forces?

A
  • Thrust
  • Drag
  • Weight
  • Lift
18
Q

How is thrust transferred into motion?

A

By the use of the aircrafts mast and rotors

19
Q

What part of the aircraft creates thrust?

A

The aircrafts engine.

20
Q

What is drag?

A

A disruption in the flow of air due to the objects shape and size.

21
Q

What other aerodynamic force does drag act against?

A

Thrust.

22
Q

Name four different types of drag.

A
  • Profile Drag
  • Induced Drag
  • Parasite Drag
  • Total Drag
23
Q

Define Profile drag

A

Frictional resistance of a helicopters blades passing through the air.

24
Q

What are two forms of profile drag?

A

Form Drag and Skin Drag

25
Q

Which form of drag is being applied when there is an increase in drag due to an increase of speed of the helicopter?

A

Form drag

26
Q

The roughness of a rotors blade surface can increase the drag on a aircraft. Which form of drag is this?

A

Skin drag

27
Q

Which form of drag is caused by the airflow circulation around the blades?

A

Induced Drag

28
Q

What is parasite drag? Name a few examples.

A

Any external components to the aircraft. For example, landing gear, doors, or cowlings.

29
Q

When this is at its lowest value, the maximum endurance, and best rate of climb is achieved. What is it?

A

Total drag.

30
Q

What is the downward force which acts through the center of gravity on the helicopter?

A

Weight

31
Q

Can a helicopter increase its weight mid-flight?

A

Yes.

32
Q

Given an aircraft is banking or experiencing severe gusts. What force is applied to the aircraft? What happens as a result?

A

G force is applied to the aircraft, resulting in an increase of the aircraft’s weight.

33
Q

What is the upward force created by the spinning of the helicopters blades, allowing air to pass over them?

A

Lift

34
Q

What is the term for a helicopter blades direction, relative to the air?

A

Angle of Attack

35
Q

How can the pilot change his/her Angle of Attack?

A

By moving the cyclic and collective

36
Q

What are some non-user factors that could impact your Angle of Attack?

A
  • Blade flapping
  • Blade flexing
  • turbulent conditions
37
Q

Is the Angle of Attack a mechanical or aerodynamic angle?

A

Aerodynamic

38
Q

Is the Angle of Incidence a mechanical or aerodynamic angle?

A

Mechanical

39
Q

What is the intersection of the chord line with the plane of rotation?

A

The Angle of Incidence
OR
The blade pitch angle

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