Normal-pressure tests of rectangular plates Page: 2 of 29
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AERONAUTIC SYMBOLS
1. FUNDAMENTAL AND DERIVED UNITS
Metri English
g
unit A bbrevia- Unit Abbrevia-
tion tion
Length meter----------------- m foot(or mile)--------ft(ormi)
Time---- - - second- ------------- s second (or hour)------see (orhr)
Force----- - -F weighIt of 1 kilogram------ kg weight of 1 pound--lb
Power--------P horsepower (metric)_------- -horsepower-------- - hp
SSpeed-.-... : kilometers per hour- ; -- - kp:: miles per hour--:- :-::: :: : mph
meters per secon ...mps feet per secnd... .fp
2. GENERAL SYMBOLS.
W Weight= Kinematic viscosity
g Sttandard acceleration of gravity=9.80665 m/s p Density (mass per unit volume)
or 32.1740 ft/see Standard density of dry air, 0.12497 kg-m'-s' at 150 C
m MassJ and 760 mm; or 0.002378 lb-ft-' sec
g Specific weight of "standard" air, 1.2255 kg/mi or
Moment of inertia=mk9. (Indicate axis of 0.07651 lb/cu ft
radius of gyration k by proper- subscript.)
S Coefficient of viscosity
S. AERODYNAMIC SYMBOLSArea
Area of wmg,--
Gap
Span
.Chord
Aspect ratio,
True air speedS- Dynamic pressure, V
L " Lift, absolute coefficient C= i
D Drag, absolte coefficient : :-
Do Profile drag, absolute coefficient C ,
D. ::- Induced drag, absolute coefficient -, .
D, Parasite drag, absolute coefficientC :
&C. :cross-wind.. force, :absolute coeficient C=
26260,- Angle of setting of wings (relative to thrust line)
i: Aigle of stabilizer setting (relative to thrust
ene)i
9 Resultant moment
Resultant.:angular velocity
. Reynolds number, P-where . is -a- linear dimen-
sion (e.g., for an airfoil of 1.0 ft chord, 100 mph,
standard pressure at 150 C, the corresponding
:Reynolds number is 935400;. or for an airfoil
of 1.0 m chord, 100 .mps, the ::-corresponding
.Reynolds. nmber is 6,865000)
~o Angle of attack, infinite aspect ratio
a Angle of attack, induced
a, Angle of.attak, absolute (measured from zero-
lift position)
7 .Flight-path angleSW
A
Vm
I
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Ramberg, Walter; McPherson, Albert E. & Levy, Samuel. Normal-pressure tests of rectangular plates, report, 1942; (https://digital.library.unt.edu/ark:/67531/metadc60008/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.