Page 66 - Aeronautical Engineer Data Book

Symbols and notations 53
Table 3.4 Continued

n Frequency. Number of revs per second.
Polytropic exponent.
N Yawing moment.
o Origin of co-ordinates.
p Roll rate perturbation. Static pressure in a fluid.
P Power. Total pressure.
Stagnation pressure.
P 0
Static pressure.
P s
Total pressure.
P t
q Pitch rate perturbation. A propeller coefficient.
Discharge quantity.
Q Dynamic pressure.
r Yaw rate perturbation. General response
variable. Radius vector.
R Radius of turn. Resultant force. Characteristic
gas constant.
Re Reynolds number.
s Wing semi-span. Laplace operator. Specific
entropy. Distance or displacement.
S Wing area.
Projected body side reference area.
S B
Fin reference area.
S F
Tailplane reference area.
S T
t Time. Maximum airfoil section thickness.
T Time constant. Thrust. Temperature.
Roll time constant.
T r
Spiral time constant.
T s
u Velocity component. Internal energy.
u Input vector.
U Total axial velocity.
Axial component of steady equilibrium velocity.
U e
Axial velocity component referred to datum-path
U E
earth axes.
v Lateral velocity perturbation.
v Eigenvector.
V Total lateral velocity.
Lateral component of steady equilibrium velocity.
V e
Lateral velocity component referred to datum-
V E
path earth axes.
Steady equilibrium velocity.
V 0
Fin volume ratio.
V F
Resultant speed.
V R
Stalling speed.
V S
Tailplane volume ratio.
V T
V Eigenvector matrix.
w Normal velocity perturbation. Wing loading.
Downwash velocity.
W Total nomal velocity. Weight.
Normal component of steady equilibrium velocity.
W e
Normal velocity component referred to datum-
W E
path earth axes.