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Appendix 1:
Greek symbols
The following are some of the aerospace usages of letters
of the Greek alphabet. In almost all cases the meaning is
refined by a selection of suffixes or other additions.
α (alpha) 1 Angle of attack, or tilt angle of primary
nozzle (α . , AOA rate; α frl , relative to fuselage reference
line; α e , effective; α ind , induced α geo , geometric; α o , difference
in AOA between wing and horizontal tail, α o also
aerofoil at zero lift).
2 Generalized symbol for acceleration, angular as well
as linear.
3 Absorption factor.
4 Propeller or compressor axial inflow factor.
5 Decay or attenuation coefficient (radio).
6 Coefficient of linear thermal expansion.
7 Degree of dissociation.
8 As subscript, free-stream conditions.
9 See Alpha eta rho in body of dictionary.
β (beta) 1 Angle of sideslip (β . , sideslip rate).
2 Angle between fluid and tangentially moving blade;
pitch angle; β 0 , helicopter coning angle.
3 Particular operating regime of propeller when pilot
selects pitch directly (available on ground only).
4 Angle of incidence of tailplane relative to main wing.
5 Angle of yaw (airships).
6 Coefficient of cubic thermal expansion (γ preferred).
7 Luminance factor.
8 Diffuser angle.
9 Angle between thrust line and body datum.
10 Tip-back angle.
11 Helical-gear skew angle.
γ (gamma) 1 Ratio of specific heats of gas (at constant
pressure and constant volume).
2 Surface tension.
3 Dihedral angle.
4 Flight path (or gliding) angle, relative to horizontal:
common suffixes are: c, climb; CMD, commanded by
pilot; CON, commanded by an AFCS; D, d, dive or
descent; DISP, displayed in cockpit; S, corrected to sea
level.
5 Electrical conductivity.
6 Free-stream velocity (non-dimensional).
7 Magnetometer field strength, in MAD operations
usually = 10 –5 oersted.
8 Coefficient of cubic thermal expansion.
9 Shear strain (also φ).
10 Suffix TiAl, low-density titanium aluminide
(