An Investigation of the Effect of the WADC 30,000-Horsepower Whirl Rig Upon the Static Characteristics of a Propeller Page: 3 of 32
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2 NACA RM SL52F20
**o The proposed 30,000-horsepower whirl rig is of such design as to
.o present a bluff body to the propeller slipstream close to the propeller
** disk. The primary purpose of the tests was to determine the effects of
the whirl-rig interference on propeller aerodynamic characteristics.
The secondary purpose of the tests was to obtain the air loads produced
* upon the motor housing by the propeller slipstream. By statically
testing a propeller on the 6000-horsepower propeller dynamometer in the
presence of the scale model of the whirl rig, and making similar tests
without the model, comparisons may be made to determine the effect of
the model upon the aerodynamic characteristics of the propeller.
b blade width, ft
cZd design section lift coefficient
Cp power coefficient, pn3D
CT thrust coefficient, p
CT/CP static thrust figure of merit
D propeller diameter, ft
h blade section maximum thickness, ft
H total pressure, lb/sq ft
aH H - Pa
-- pressure coefficient,
Mt rotational tip Mach number
n propeller rotational speed, rps
p static pressure, lb/sq ft
P power, ft-lb/sec
Pa atmospheric pressure, lb/sq ft
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Salters, Leland B., Jr. & Norton, Harry T., Jr. An Investigation of the Effect of the WADC 30,000-Horsepower Whirl Rig Upon the Static Characteristics of a Propeller, report, July 2, 1952; (https://digital.library.unt.edu/ark:/67531/metadc64716/m1/3/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.