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Flight Dynamics > Stability Derivatives Review > Flashcards

Stability Derivatives Review Flashcards

1
Q

Give the correct sign for the given derivative:

C_L_alpha

A

> 0

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2
Q

Give the correct sign for the given derivative:

C_l_de

A

> 0

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3
Q

Give the correct sign for the given derivative:

C_L_ih

A

> 0

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4
Q

Give the correct sign for the given derivative:

C_D_0

A

> 0

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5
Q

Give the correct sign for the given derivative:

C_D_alpha

A

> 0

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6
Q

Give the correct sign for the given derivative:

C_M_alpha

A

<0

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7
Q

Give the correct sign for the given derivative:

C_M_ih

A

<0

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8
Q

Give the correct sign for the given derivative:

C_y_beta

A

<0

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9
Q

Give the correct sign for the given derivative:

C_y_dr

A

> 0

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10
Q

Give the correct sign for the given derivative:

C_l_beta

A

<0

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11
Q

Give the correct sign for the given derivative:

C_l_da

A

> 0

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12
Q

Give the correct sign for the given derivative:

C_l_dr

A

> 0

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13
Q

Give the correct sign for the given derivative:

C_n_beta

A

> 0

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14
Q

Give the correct sign for the given derivative:

C_n_dr

A

<0

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15
Q

Give the assumptions for straight flight:

A
  1. p = q = r =0
  2. psi dot = constant
  3. All SS assumptions
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16
Q

Give the assumptions for symmetric flight:

A
  1. SS

2. beta = v =0

17
Q

Give the assumptions for level flight.

A
  1. Gamma = 0

2. SS

18
Q

Give the assumptions for balanced flight.

A
  1. Y = 0 (no side force)

2. SS

19
Q

What are the longitudinal static stability requirements?

A
  1. C_M_alpha <0
  2. C_M_0 >0
  3. The CG must be in front of the AC
20
Q

What are the lateral static stability requirements?

A
  1. C_l_beta <0

2. C_n_beta >0

21
Q

If the static margin is greater than zero the aircraft has ____ stability.

A

Positive static

22
Q

If the static margin is less than zero the aircraft has ____ stability.

A

Negative static

23
Q

If the static margin is equal to zero the aircraft has ____ stability.

A

Neutral

Flight Dynamics (7 decks)

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