Stability Derivatives Review Flashcards
Give the correct sign for the given derivative:
C_L_alpha
> 0
Give the correct sign for the given derivative:
C_l_de
> 0
Give the correct sign for the given derivative:
C_L_ih
> 0
Give the correct sign for the given derivative:
C_D_0
> 0
Give the correct sign for the given derivative:
C_D_alpha
> 0
Give the correct sign for the given derivative:
C_M_alpha
<0
Give the correct sign for the given derivative:
C_M_ih
<0
Give the correct sign for the given derivative:
C_y_beta
<0
Give the correct sign for the given derivative:
C_y_dr
> 0
Give the correct sign for the given derivative:
C_l_beta
<0
Give the correct sign for the given derivative:
C_l_da
> 0
Give the correct sign for the given derivative:
C_l_dr
> 0
Give the correct sign for the given derivative:
C_n_beta
> 0
Give the correct sign for the given derivative:
C_n_dr
<0
Give the assumptions for straight flight:
- p = q = r =0
- psi dot = constant
- All SS assumptions
Give the assumptions for symmetric flight:
- SS
2. beta = v =0
Give the assumptions for level flight.
- Gamma = 0
2. SS
Give the assumptions for balanced flight.
- Y = 0 (no side force)
2. SS
What are the longitudinal static stability requirements?
- C_M_alpha <0
- C_M_0 >0
- The CG must be in front of the AC
What are the lateral static stability requirements?
- C_l_beta <0
2. C_n_beta >0
If the static margin is greater than zero the aircraft has ____ stability.
Positive static
If the static margin is less than zero the aircraft has ____ stability.
Negative static
If the static margin is equal to zero the aircraft has ____ stability.
Neutral
