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Aviation 2100 > AVN 2100 Stability > Flashcards

AVN 2100 Stability Flashcards

1
Q

An airplane ____ about the longitudinal axis.

A

Rolls

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2
Q

An airplane ______ about the lateral axis.

A

Pitches

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3
Q

An airplane _____ about the vertical axis

A

Yaws

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4
Q

Trim and flaps are _______ control surfaces

A

Secondary

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5
Q

The purpose of a trim device is to:

A

Minimize the effort of the pilot when moving a control surface or maintaining that surface in a desired position.

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6
Q

Trim lessons the _____ felt by the pilot on the associated flight controls

A

Aerodynamic resistance

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7
Q

The three axes of motion intersect at the ______

A

Center of gravity

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8
Q

The center of gravity is the theoretical point where _______

A

The entire weight of the plane is concetrated

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9
Q

The center of pressure is the ______

A

Point along the chord line of an airfoil where life is concentrated.

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10
Q

The center of pressue is also known as the _______

A

Center of lift

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11
Q

Stability is the ______

A

Tendency of the aircraft to return to its original condition after being dispaced

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12
Q

A stable aircraft will ______ return to its original position

A

Return

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13
Q

An unstable aircraft will ______ from its original position

A

Move farther away

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14
Q

A neutral aircraft will ______ in its displaced position

A

Remain

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15
Q

The two types of stability are :

A

Static and dynamic

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16
Q

Positive Static stability is:

A

The initial tendency to return to original position

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17
Q

Positive Dynamic stability is:

A

The tendency of the aircraft to return to its original position over a period of time

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18
Q

With negative static stability, an aircraft tends to:

A

Initially displace farther from its original position

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19
Q

Oscillations _____ in a displaced aircraft with ________

A

Negative dynamic stability

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20
Q

Oscillations will remain the same in a displaced aircraft with ________

A

Neutral dynamic stability

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21
Q

If an aircraft returns to its original position thorugh a series of successively smaller oscillations, it has _______

A

Positive dynamic stability

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22
Q

Longitudinal stability involves _____ motion about the ______ axis

A

Pitching, lateral

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23
Q

If an aircraft naturally returns to its original attitude it is

A

Longitudinally stable

24
Q

The center of pressure changes with the _____

A

Angle of attack

25
Q

The center of gravity is located _____ of the center of pressure

A

Fore or aft

26
Q

As the angle of attack increases, the center of pressure _______

A

Increases

27
Q

As the center of pressure moves further aft of the CG, the aircraft becomes _____ longitudinally stable

A

Less

28
Q

The horizontal stabilizer is mounted with a ______ angle of incidence to provide _______

A

Negative, tail down force

29
Q

When the wings angle of attack is increased, the horizontal stabilizer’s angle of attack _____, thus _______ the tail down force

A

Increases, decreases, decreasing

30
Q

Decreasing the tail down force produces a _______

A

Nose down moment

31
Q

For positive longitudinal stability, when the nose goes up, tail down force should _____

A

Go down

32
Q

Longitudinal stability deponds on the _____ and its ______ from the _______

A

Size, distance, center of gravity

33
Q

The larger the ______, the _______ the longitudinal stability

A

Horizontal stabilizer, greater

34
Q

The greater the distance of the tail from the ______, the _______ the longitudinal stability

A

Center of gravity, greater

35
Q

4 characteristics of CG too far forward:

A

Higher stalling speed, more stable, slower cruise speed, not enough elevator authority

36
Q

4 characteristics of CG too for aft:

A

Lower stall speed, faster cruise speed, less stable (easier to stall and spin and harder to recover)

37
Q

Because of the effects of the propeller slipstream, reduced thrust will reduce the _____ , meaning that the nose will _____

A

Taildown force, drop

38
Q

Directional stability is stability about the _____ axis

A

Vertical

39
Q

When an aircraft yaws, the vertical stabilizer has an _____ with respect to the relative wind

A

Angle of attack

40
Q

When yawing, the induced angle of attack of the ______ produces a restorative ______

A

Fin, moment

41
Q

The farther from the ______ that the vertical stabilizer is, the greater the _______

A

Center of gravity, directional stability

42
Q

The larger the ______, the greater the ______ stability about the vertical axis

A

Vertical stabilizer, directional

43
Q

“Keel Surfaces” refer to _______

A

Side surfaces of the aircraft

44
Q

When an airplace is _____, keel surfaces are exposed to the relative wind.

A

Yawed

45
Q

The greater the area of the keel surface, the ____ it contribution to ________

A

Greater, directional stability

46
Q

Lateral stability is built into an aircraft with four things:

A

Dihedral, swept wings, high keel surfaces, low CG

47
Q

What is dihedral?

A

The angle that the wings are inclined upward from the fuselage towards the wingtips

48
Q

Dihedral increases ______ stability because the increased ______ of the low wing increases its ________

A

Lateral, angle of attack, lift

49
Q

Why do swept back wings contribute to lateral stability?

A

The lower wing exposes more of its span to the airflow when rolled

50
Q

Uneven fuel burning may result in _______

A

Lateral instability

51
Q

What is dutch roll?

A

A lateral motion that is a combination of rolling/yawing, side to side oscillations

52
Q

A series of uncoordinated turns alternately in opposite directions is:

A

Dutch roll

53
Q

The differential lift created between the two wings when turning creates a _____ differential, leading to ______

A

Drag, adverse aileron yaw

54
Q

Increased dihedral increases the tendency to ______

A

Dutch roll

55
Q

Does dutch roll resolve itself on most aircraft?

A

Yes

56
Q

Typically, dutch roll is the result of two things:

A
  1. A sharp wind gust against one wing 2. A very large control input that is suddenly released
57
Q

Inputing a very large control movement and then suddenly releasing it may induce ______

A

Dutch Roll

Aviation 2100 (15 decks)

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