Page 67 - Aeronautical Engineer Data Book

54 Aeronautical Engineer’s Data Book
Table 3.4 Continued

x Longitudinal co-ordinate in axis system.
x State vector.
X Axial force component.
y Lateral co-ordinate.
Lateral body ‘drag’ coefficient.
y B
y Output vector.
Y Lateral force component.
z Normal co-ordinate in axis system. Spanwise co­
ordinate.
z Transformed state vector.
Z Normal force component.
Greek symbols
Angle of incidence or attack. Acceleration
(angular).
' Incidence perturbation.
Equilibrium incidence.
e
Local tailplane incidence.
T
Sideslip angle perturbation. Compressibility.
Equilibrium sideslip angle.
e
Elevator trim tab angle.

Flight path angle perturbation.
Equilibrium flight path angle.

e
Wing dihedral angle (half). Circulation. Strength
of vortex.
Airfoil section camber. Boundary layer thickness.
m Mass increment.

Throttle lever angle. Downwash angle.
Rudder angle perturbation. Damping ratio.
Vorticity.
Efficiency.
Pitch angle perturbation. Angle.
Equilibrium pitch angle. Angular co-ordinate
e
(polar). Propeller helix angle.
Eigenvalue. Wavelength. Friction coefficient in a
pipe.
Wing sweep angle.
µ Viscosity (dynamic).
Longitudinal relative density factor.
µ 1
Lateral relative density factor.
µ 2
Viscosity (kinematic).
Aileron angle perturbation.
Density.
Aerodynamic time parameter. Tensile stress.
Engine thrust perturbation. Shear stress.
Phase angle. A general angle.
State transition matrix.
Yaw angle perturbation. Stream function.
Natural frequency. Angular velocity.
Bandwidth frequency.
b
Damped natural frequency.
n