A

= area; constant

a

= speed of sound; constant

b

= constant

C

= effective exhaust velocity [Eq. (1.53), Eq. (3.4)]; circumference; work output coefficient

C _A

= angularity coefficient

C _C

= work output coefficient of core

C _D

= coefficient of drag; discharge coefficient

C _F

= thrust coefficient

C _fg

= gross thrust coefficient

C _L

= coefficient of lift

C _p

= pressure coefficient

C _prop

= work output coefficient of propeller

C _tot

= total work output coefficient

C _V

= velocity coefficient

C*

= characteristic velocity [Eq. (3.38)]

c

= chord

c _p

= specific heat at constant pressure

c _v

= specific heat at constant volume

c _x

= axial chord

D

= drag

d

= diameter

E

= energy; modulus of elasticity

e

= internal energy per unit mass; polytropic efficiency; exponential, 2.7183

F

= force; uninstalled thrust; thrust

F _g

= gross thrust

f

= fuel/air ratio; function; friction coefficient

g

= acceleration of gravity

g _c

= Newton's constant

g ₀

= acceleration of gravity at sea level

H

= enthalpy; dimensionless enthalpy [Eq. (2.86)]

h

= enthalpy per unit mass; height

h _PR

= low heating value of fuel

= enthalpy of formation

I

= impulse; impulse function, PA(1 + ?M ²)

I _sp

= specific impulse [Eq. (1.55),...