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Basic Helicopter Aerodynamics, 3rd Edition by Simon Newman, John M. Seddon

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Notation

General

a lift curve slope dCL/dα
a0 first term in Fourier expansion of β
a1 coefficient of second term in Fourier expansion of β
a2 coefficient of fourth term in Fourier expansion of β
A area of rotor disc
Ab total blade area (N blades)
A1 coefficient of second term in Fourier expansion of β
A2 coefficient of fourth term in Fourier expansion of β
Ap projected frontal area of rotor head (Chapter 6)
As flow spoiling factor (Chapter 6)
Az boundary layer shielding factor (Chapter 6)
b1 coefficient of third term in Fourier expansion of β
b2 coefficient of fifth term in Fourier expansion of β
B tip loss factor in r = BR
B1 coefficient of third term in Fourier expansion of β
B2 coefficient of fifth term in Fourier expansion of β
c blade chord
CD drag coefficient
CL lift coefficient
CH H-force coefficient
CP power coefficient
CQ torque coefficient
CT thrust coefficient
d differential operator
D aerodynamic drag
e hinge offset ratio
f equivalent flat-plate area
H H-force
I moment of inertia
k empirical constant in expression for profile power
K empirical constant in Glauert expression for induced velocity
l moment arm of tail rotor thrust about main shaft
L aerodynamic lift
m blade mass per unit span
M figure of merit
M Mach number
M moment (Figures 8.4 and 8.5)
MT aerodynamic moment about flapping axis
n inertia number (Chapter 8)
N number of blades
p static pressure
P power
q dynamic pressure, ...

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