Theoretical motions of hydrofoil systems Page: 2 of 30
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1. FUNDAMENTAL AND DERIVED, UNITS
Metric - English
Unit Abbrevia- UnitAbbrevi
Length _ meter- ---- .-. -- m . m foot (or mile)--,-.-. -ft (or mi)
Time_ e---------- scond_ .. .... a , second (or hour).---. se (or r)
Force, , F weight of 1 kilogram . . . kg- weight of 1 pound-_-_, Plb
Power_ -- P horsepower (metric)- ..--- .---horsepower . ..-,-. hp
Speed kilometers per hour-- kph miles per hour__- -mph
SSpe--, meters per second_-. mps feet per second._- fps
-2. GENERAL SYMBOLS
WV Weight=mg _, Kinematic viscosity
g Standard- acceleration of gravity -9.80665 m/sl p Density (mass per unit volume)
or 32.1740 ft/sec2-- Standard density of dry air, 0.12497 kg-m--s' at 150 0
W and 760 mm; or 0.002378 lb-ft-' sec2
n Mass= Specific weight of "standard" air, 1.2255 kg/m or,
S -Moment of inertia=m9. (Indicate axis of 0.07651lb/cu It
radius of gyration k by proper subscript.)
- . Coefficient of viscosity:
S- - .--- AERODYNAMIC SYMBOLS
Area of wing
True air speed.
Dynamic pressure, 2p
S- Lift, absolute coefficient O
D Drag, absolute coefficient D
D. Profile drag, absolute coefficient oD = D
D - Induced drag, absolute coefficient 0,
D, Parasite drag, absolute coefficient J,= q
. Oros-wind force, absolute coefficient Co=
i, Angle of setting of wings. (relative to thrust line)
i " Angle of stabilizer setting (relative to thrust
Q Resultant moment
0 Resultant angular velocity,
R. Reynolds number, p- where l 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 935,400; or for an airfoil
of 1.0 m :chord, 100 mps, the -corresponding
Reynolds number is.6,865,000)
a Angle of. attack
e Angle of downwash
a, Angle of attack, infinite aspect ratio
at Angle of attack, induced
as : Angle of attack, absolute (measured from zero-
Fv -light-path angle
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Imlay, Frederick H. Theoretical motions of hydrofoil systems, report, May 9, 1947; (digital.library.unt.edu/ark:/67531/metadc60228/m1/2/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.