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M8 > 8.4 Flight Stability And Dynamics > Flashcards

8.4 Flight Stability And Dynamics Flashcards

1
Q

Three axis working on a plane

A

Longitudinal axis
Lateral axis
Vertical axis

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2
Q

Pitch works on what axis?

A

Lateral axis

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3
Q

Yaw works on what axis?

A

Vertical axis

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4
Q

Roll works on what axis?

A

Longitudinal axis

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5
Q

Stability affects what two areas?

A

Manoeuvrability
Controllability

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6
Q

What is static stability?

A

The initial tendency of an aircraft to return back to its position of equilibrium

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7
Q

Three types of static stability?

A

Positive static stability
Neutral static stability
Negative static stability

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8
Q

What is positive static stability?

A

An aircraft that has positive static stability has the tendency to return to the original state of equilibrium after being disturbed.

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9
Q

What is neutral static stability?

A

An aircraft that has neutral static stability tends to stay in its new attitude when it’s disturbed

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10
Q

What is negative static stability?

A

An aircraft that has negative static stability tends to continue moving away from its original attitude when it’s disturbed

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11
Q

What is longitudinal stability?

A

the tendency for the nose to pitch up or pitch down, rotating around the lateral axis.

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12
Q

When gust hits upper part of aircraft surface what happens?

A

Nose down rotation

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13
Q

When gust hits lower part of aircraft surface what happens

A

Nose up rotation

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14
Q

Directional stability is around what axis?

A

Vertical axis

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15
Q

The movement of directional stability is what?

A

Yaw

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16
Q

Directional stability is also known as what?

A

Weathercock stability

17
Q

What improves directional stability?

A

Sweep back of a wing
Dorsal fin
Keel surface

18
Q

Lateral stability is on what axis?

A

Longitudinal axis

19
Q

Four main design factors to keep aircraft laterally stable?

A

Dihedral
Sweep back
Keel effect
Weight distribution

20
Q

What is the side slip angle?

A

The sideslip angle is the angle between the aircraft centreline and the sideslip direction.

21
Q

Dutch roll exists when?

A

Dutch roll exists when there is a greater effect on the lateral stability than on the directional stability.

M8 (4 decks)

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