Aircraft Flight Dynamics and Performance Engineer.
Air Vehicles Division,
Defence Science and Technology Organisation.
Ph. (03) 9626 7318,
Fax (03) 9626 7085.
email: [EMAIL PROTECTED]
Flight Systems Units of Measure Guidelines.
$Revision: 1.1$ $Date: 2004/10/26$ Written by: Geoff Brian ([EMAIL PROTECTED])
Table of Contents
Introduction
This document, although not exhaustive, lists abbreviations for units of measure common in the Aircraft Modelling and Simulation community.
Aircraft flight simulations and models compute the behaviour of the aircraft subject to stimuli such as flight control system inputs and environments influences. They also rely on a representation of the physical properties of the aircraft such as its aerodynamics, propulsion system and mass properties. Data detailing the inputs and outputs from simulations, as well as the physical properties of the aircraft, have different units of measure, and also may be mixed between Système Interantionale (SI) units and Imperial units. This guideline presents the units of measure for data utilised by aircraft simulations and models developed by Flight Systems, Air Vehicles Division, DSTO. The Flight Systems Units of Measure Guideline is based on the AIAA Modeling and Simulation Technical Committee "Standards for the Exchange of Simulation Modeling Data  Preliminary Draft", [1].
Comments
 Data may have a base unit of measure, as shown in following table, or may be a combination of units; for example, metre: m or acceleration: m s^{2}.
 The prefix abbreviations are applied to the base unit of measure abbreviation, and scale the data using values in the comment box; for example, millimetre: mm = 10^{3} m
 For data that have a combined unit of measure, they will be defined using base units elements separated by a blank space; for example, fuel flow rate: l s^{1}
 Divisor units of measure are represented by the unit abbreviation raised to the equivalent negative power; for example, feet per second is represented as ft s^{1}
 Velocity is generally represented using a combined unit of measure; for example, m s^{1}. However, the knot is a recognised measure in the aviation community and thus included.
Units of Measure Abbreviations
SI  Système Interantionale
Measure  Abbreviation  Comments 
General  
nondimensional 
ND 
Used if nondimensional parameter 
Prefix ^{2}  
tera 
T 
10^{12} * parameter 
giga 
G 
10^{9} * parameter 
mega 
M 
10^{6} * parameter 
kilo 
k 
10^{3} * parameter 
deci 
d 
10^{1} * parameter 
centi 
c 
10^{2} * parameter 
milli 
m 
10^{3} * parameter 
Time  
Solar year 
yr 

Solar day 
day 

hour 
h 

minute 
min 

second 
s 
SI Standard 
Length  
metres 
m 
SI Standard 
inch 
in 

feet 
ft 

yard 
yd 

nautical mile 
nmi 

statute mile 
smi 

Velocity ^{5}  
knot 
kn 
nmi h^{1} 
Volume  
litre 
l 
10^{3 }m^{3} 
US gallon 
USgal 

UK gallon 
UKgal 
Imperial Gallon 
Mass  
kilogram 
kg 
SI Standard  10^{3}g 
gram 
g 

tonne 
tonne 

slug 
slug 

short ton 
USton 
US Ton 
long ton 
UKton 
UK Ton 
Force  
Newton 
N 
SI Standard 
Pound Force 
lbf 

Pressure  
Pascal 
Pa 
N m^{2} 
millimetres Mercury 
mmHg 

Pounds per square foot 
lbf ft2 
lbf ft^{2} 
Pounds per square inch 
lbf in2 
lbf in^{2} 
inches Mercury 
inHg 

Atmosphere 
atm 

Temperature  
degrees Kelvin 
K 
SI Standard 
degrees Centigrade 
C 

degrees Farenheight 
F 

degrees Rankin 
R 

Viscosity  
Poise 
Ps 
Dynamic viscosity 
Stokes 
St 
Kinematic viscosity 
Plane Angle  
degree 
deg 

radian 
rad 

revolution 
rev 

Power, Energy  
Watt 
W 
SI Standard 
horsepower 
hp 
550 ft lbf s^{1} 
joule 
jou 
SI Standard 
British thermal unit 
btu 

calorie 
cal 

erg 
erg 

Electrical, Magnetic  
volt direct current 
Vdc 

volt alternating current 
Vac 

ampere 
A 
SI Standard 
omh, resistance 
ohm 
SI Standard 
cycle 
cyc 

henry 
hy 

farad 
fd 

Telsa 
T 
field strength 
References
 "Standards for the Exchange of Simulation Modeling Data", Preliminary Draft, 9 June 1997, AIAA Modeling and Simulation Technical Committee.
 "SI Units Dimensional Analysis &, Chapter 8 Figure  Conversion Tables", McMahonlines, MathTech Reference Series.
