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Module 8 > 8.4 Flight Stability And Dynamics > Flashcards

8.4 Flight Stability And Dynamics Flashcards

1
Q

What are the two types of stability?

A
  • static stability

- dynamic stability

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2
Q

What is static stability?

A

When an aircraft is displaced from level flight, it will return to its equilibrium position

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3
Q

What are the three types of static stability?

A
  • positive (moves back)
  • negative (moves away)
  • neutral (no movement)
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4
Q

What is dynamic stability?

A

The continuous motion of a body over time

- only when there is a POSITIVE static stability present

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5
Q

What are the three types of dynamic stability oscillations?

A

Divergent (negative dynamic stability)
Damped (positive dynamic stability)
Undampened ( neutral dynamic stability)

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6
Q

What are the three aircraft axis’?

A
  • longitudinal
  • lateral
  • vertical
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7
Q

What occurs on the longitudinal axis?

A

The roll movement

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8
Q

What occurs on the lateral axis?

A

The pitch movement

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9
Q

What occurs on the vertical axis?

A

The yaw movement

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10
Q

What is another name for the directional stability?

A

Weathercock stability

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11
Q

What does the sweep back of a wing increase?

A

Directional stability

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12
Q

What are two other ways of increasing the directional stability on older or military aircraft?

A
  • dorsal fin

- keel surface

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13
Q

What determines the lateral stability?

A
  • angle of attack
  • dihedral angle
  • sweepback angle
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14
Q

What is an advantage of the dihedral angle?

A

It helps restore level flight

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15
Q

What is the side-slip angle?

A

The angle between the aircraft centreline and the side-slip direction

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16
Q

What is “Dutch Roll”?

A

It exists when there is a greater effect on the lateral stability than the directional stability

17
Q

What type of aircraft is “Dutch wing” found on?

A

All aircraft with swept wings

18
Q

How can the directional stability be increased?

A

Increasing the size of the vertical stabiliser (however this increases weight and drag)

19
Q

What do most aircraft have to improve directional stability instead of increasing the size of the vertical stabiliser?

A

Yaw Damping System - automatic system deflects control surface on the vertical stabiliser (rudder)

20
Q

With directional stability, would a “forward-going” wing produce more or less lift?

A

More lift

21
Q

What is longitudinal stability?

A

The stability of the aircraft around the lateral axis

22
Q

What happens if the distance between the CofG and the aerodynamic centre is:

  • Large?
  • Small?
A
  • Large = longitudinal stability is high

- Small = longitudinal stability is low

Module 8 (4 decks)

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