A |
wing aspect ratio, b2/S for monoplanes and (Kb)2/S for multiplanes (see app. C for values of K, Munk's span factor) |
b |
wing span (span of upper wing is given for biplane configurations), feet |
c |
wing chord, feet |
Cd |
section drag coefficient |
CP |
specific fuel consumption, pounds of fuel per brake horsepower per hour |
Cr |
wing root chord, feet |
Ct |
wing tip chord, feet |
Cl |
section lift coefficient |
Cl ,Max |
section maximum lift coefficient |
(clc/CLc) |
span-loading parameter |
|
mean aerodynamic chord, feet |
CD |
drag coefficient |
CD,o |
zero-lift drag coefficient |
CD,min |
minimum drag coefficient |
CL |
lift coefficient |
CL,max |
maximum lift coefficient |
Cm |
pitching-moment coefficient |
|
skin friction parameter (drag coefficient based on total wetted area) |
D |
drag, pounds |
[506] f |
drag area, CD,oS |
g |
acceleration due to gravity |
h |
altitude, feet |
hce |
service ceiling, feet |
hSL |
sea-level rate of climb, feet per minute |
|
power parameter, |
|
aircraft length, feet |
lL |
landing field length, feet |
lT |
takeoff field length, feet |
(L/D)max |
maximum lift-drag ratio |
M |
Mach number |
P |
engine power, horsepower |
Po |
maximum power available at sea level, horsepower |
R |
aircraft range, statute miles |
RD |
mission radius, statute miles |
RF |
ferry range, statute miles |
Rh |
hypothetical range, statute miles |
S |
wing area (includes both wings for biplanes), square feet |
T |
time required to climb to specified altitude, minutes; or thrust, pounds |
T/W |
thrust-to-weight ratio or thrust loading |
t/c |
airfoil-section thickness ratio, percent |
|
useful load fraction, 1-(We/Wg) |
V |
speed, miles per hour (statute miles) |
Vc |
cruising speed, miles per hour (statute miles) |
Vce |
cost-economical cruising speed, miles per hour (statute miles) |
Vmax |
maximum speed, miles per hour (statute miles) |
Vs |
stalling speed, miles per hour (statute miles) |
W |
aircraft weight, pounds |
[507] We |
aircraft empty weight, pounds |
Wg |
aircraft design gross weight, pounds |
Wg/S |
wing loading for design gross weight, pounds per square foot |
Wg/Po |
power loading for design gross weight, pounds per horsepower |
WL |
maximum aircraft landing weight, pounds |
Wmax |
aircraft maximum gross weight, pounds |
WP |
payload weight, pounds |
Wt |
propulsion-system weight, pounds |
Wt/Wg |
engine weight fraction |
W/P |
power loading, pounds per horsepower |
W/S |
wing loading, pounds per square foot |
y |
distance along wing span measured from wing centerline, feet |
|
angle of attack, degrees |
|
section angle of attack (fig. 5.6), degrees |
|
percentage of maximum sea-level power |
|
semispan wing position, 2y/b; or overall propulsion-system efficiency, percent |
|
engine cycle efficiency, percent |
|
propulsive efficiency, percent |
|
wing sweepback angle, measured at wing quarter-chord line unless otherwise noted, degrees |
|
wing taper ratio, Tip chord/Root chord |
|
atmospheric density
|
|
atmospheric density at sea level
|
|
atmospheric density ratio / |
AAHS |
American Aviation Historical Society |
AIAA |
American Institute of Aeronautics and Astronautics |
AIRCO |
Aircraft Manufacturing Company |
ALCM |
air-launched cruise missile |
ALDCS |
active load distribution control system |
ATA |
Air Transport Association |
[508] AWACS |
airborne warning and control system |
BOAC |
British Overseas Airways Corporation |
CAP |
combat air patrol |
FAA |
Federal Aviation Administration |
FAR |
Federal Air Regulations |
Flt. Intl. |
Flight International Magazine |
FOD |
foreign object damage |
JATO |
jet-assisted takeoff |
LABS |
low-altitude bombing system |
LaRC |
Langley Research Center |
LMAL |
Langley Memorial Aeronautical Laboratory |
MAP |
Military Assistance Program |
mfr |
manufacturer |
NACA |
National Advisory Committee for Aeronautics |
NASA |
National Aeronautics and Space Administration |
NASM |
National Air and Space Museum |
NBAA |
National Business Aircraft Association |
RAF |
Royal Air Force |
RPM |
revenue passenger mile |
SAC |
Strategic Air Command |
SCRAM |
short-range attack missile |
STOL |
short takeoff and landing |
STOVL |
short takeoff and vertical landing |
ukn |
unknown |
USAF |
United States Air Force |
USAAF |
United States Army Air Force |
USN |
United States Navy |
VIFF |
vectoring in forward flight |
VSTOL |
vertical/short takeoff and landing |
VTOL |
vertical takeoff and landing |
WW |
World War |