General Information

Unit Conversions

Table: Prefix Multipliers

Exponent	Prefix	Abbreviation	Exponent	Prefix	Abbreviation
$10^{18}$	exa	E	$10^{-1 }$	deci	d
$10^{15}$	peta	P	$10^{-2 }$	centi	c
$10^{12}$	tera	T	$10^{-3 }$	milli	m
$10^{9}$	giga	G	$10^{-6 }$	micro	$\mu$
$10^{6}$	mega	M	$10^{-9 }$	nano	n
$10^{3}$	kilo	k	$10^{-12}$	pico	p
$10^{2}$	hecto	h	$10^{-15}$	femto	f
10	deka	da	$10^{-18}$	atto	a

Symbol	Usage
$\alpha$	angle of attack (degrees or radians)
$\alpha_{\tau}$	tail angle of attack
$\beta$	angle of sideslip (degrees)
$\gamma$	flight path angle relative to horizontal
$\gamma$	specific heat ratio (1.4 for air)
$\delta$	relative pressure ratio ( $\frac{P_a}{P_0}$ )
$\delta_a$	aileron deflection angle
$\delta_r$	rudder deflection angle
$\delta_e$	elevator deflection angle
$\varepsilon$	downwash angle at tail (degrees)
$\zeta$	damping ratio
$\eta$	efficiency
$\theta$	body axis/pitch angle
$\theta$	relative temperature ratio, $T_a / T_0$
$\iota$	angle of incidence
$\iota_F$	thrust angle of incidence
$\iota_T$ *	horizontal tail angle of incidence
$\lambda$	pressure lag constant
$\Lambda$	wing sweep angle
$\mu$	coefficient of absolute viscosity = $\rho \nu$
$\mu$	Mach cone angle
$\nu$	kinematic viscosity = $mu / g$
$\pi$	nondimensional parameter
$\rho$	density
$\rho_a$	ambient air density
$\rho_0$	standard atmospheric density $slugs/ft^3$
$\sigma$	air density ratio $\rho_{\alpha} / \rho_0$
$\sigma_{\mathrm{cr}}$	critical density
$\tau$	shear stress (pounds per square inch) psi
$\tau_R$	Roll Mode Time Constant (sec)
$\phi$	bank angle (degrees)
$\psi$	aircraft heading (degrees)
$\omega$	frequency
$\omega$	rotational velocity (radians per second)
$\omega_d$	damped natural frequency
$\omega_n$	natural undamped frequency