Nomenclature Greek symbols

?		=angle of attack
? _CLmax		= angle of attack corresponding to C _Lmax
? _o		= zero-lift angle of attack
? _T		= tilt angle
?		=side-slip (yaw) angle
?		=( M ² 1) ^1/2
?		=angle of climb; ratio between specific heats
? _r		= runway or ramp slope
?		=circulation
?		=relative pressure (Chapter 2); boundary layer thickness
?*		= boundary layer displacement thickness
?		= thrust angle; small number
?		=block fuel ratio
?		=lift-induced factor in drag, Eq. 4.12; propeller's efficiency
? _p		= propulsive efficiency, Eq. 13.71
?		=relative temperature; blade pitch; rudder deflection
? _o		= collective pitch
?		=polar coordinate; stagger angle ( 9.15)
?		=induced velocity factor in forward flight; Lagrange multiplier; taper ratio
? _h		= induced velocity factor in hover
? _s		= induced velocity factor in descent
?		=wing's sweep angle; vector of Lagrange multipliers (Chapter 8)
?		=dynamic viscosity; rolling coefficient; advance ratio (helicopters)
?		=parameter defined by Eq. 8.59; track angle; aileron deflection
?		=throttle position
?		=air density
? _b		= specific mass of a rotor blade
?		=relative air density; rotor solidity (Eq. 5.23)
? ₁		= relative air density (when confusion with rotor solidity arises)
?		=response time
?		=roll or bank angle; inflow angle of attack (helicopters, propellers)
?		=dihedral/anhedral...

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Flight Performance of Fixed and Rotary Wing Aircraft