An Investigation of the Effect of the WADC 30,000-Horsepower Whirl Rig Upon the Static Characteristics of a Propeller Page: 4 of 32
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NACA RM SL52F20
**: Z P - Pa
* _ -pressure coefficient, P Pa
o. Pa Pa
r propeller radius, ft
.' R propeller-tip radius, ft
T thrust, lb
Vt rotational tip speed, nnD, ft/sec
J blade angle, deg
00.75R blade angle at 0.75 tip radius, deg
p air density, slugs/cu ft
Propeller.- An NACA 10-(3)(062)-045 three-blade propeller was
mounted on the rear unit of a 6000-horsepower propeller dynamometer as
described in reference 1 and shown in figure 1. Blade-form curves are
given in figure 2. For further description of the blades, see refer-
ences 2 and 3.
Strain-gage installation.- A strain gage was installed on the thrust
face of one of the blades at the 18-inch radial station. The wires of
the gage were oriented to measure combined bending and centrifugal
stresses in the propeller blades. The electrical leads were connected
through pineapple-type slip rings on the dynamometer shaft to a recording
Whirl-rig model.- A half-scale model of the front part of the WADC
30,000-horsepower whirl rig was constructed of sheet metal and mounted
on an open framework in front of the dynamometer. Figure 3 is a photo-
graph of the model without the gear-box housing and figure 4 is a photo-
graph with the gear-box housing in place. The principal dimensions of
the model are given in figure 5.
It was desired to find the effects of the whirl-rig model upon a
propeller tested in two locations on the rig. The design of the whirl
rig provides for either of two parallel shafts for testing of propellers,
the lower shaft for large propellers of low rotational speed and the
upper shaft for smaller propellers of higher rotational speeds. In
addition, the upper shaft is provided with an extension in the form of
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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/m1/4/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.