The Effect of an Operating Propeller on the Aerodynamic Characteristics at High Subsonic Speeds of a Model of a Vertical-Rising Airplane Having an Unswept Wing of Aspect Ratio 3 Page: 5 of 91
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4 mNACA RM A52E06
MODEL AND APPARATUS
The investigation was conducted in the Ames 12-foot pressure wind
tunnel using a 1/0l-scale model of the Lockheed XFV-l airplane supplied
by the Lockheed Aircraft Corporation. The model had an unswept wing
with an aspect ratio of 3.07 and a taper ratio of 0.327. The wing
employed NACA 65A206 sections. The prototype-airplane contours were
slightly modified at the base of the model fuselage to accommodate a
sting-type model support. Figure 1 and table I present dimensions and
details of the model and figure 2 shows the model mounted in the tunnel
The six-blade dual-rotating propeller employed on the model had an
activity factor per blade of 140(defined as A.F. = 00000 lo bO1 Q )
and was designed by the Curtiss-Wright Corporation specifically for
vertical-take-off airplanes. Figure 3 presents propeller plan-form and
The model, including the propeller, was constructed of aluminum
alloy with the exception of the fuselage air-intake ducts which were
sealed off and faired with a lead alloy. Model control-surface deflec-
tions were simulated with interchangeable control surfaces machined to
predetermined angles. The model-propeller blades could be adjusted
manually to any desired angle. The surfaces of the wing, body, and tail
were filled, painted, and polished smooth.
Model power was supplied by two water-cooled induction motors
mounted in tandem in the model fuselage. Each motor developed a maximum
of 36 horsepower at 12,000 revolutions per minute. A continuous speed
control for the two motors was obtained by the use of a variable-
frequency power supply-common to both motors. Each component of the
dual-rotating propeller was directly driven by one of the model motors.
Propeller speed was measured by--means of a tachometer on the front motor
(rear propeller) used in conjunction with an electronic frequency-
measuring device. It was .assumed that both motors turned at the same
A sting-type model-support system was used with a wire-resistance
strain-gage balance of the flexure-pivot type enclosed in the model
fuselage to measure lift, longitudinal force, side force, pitching
moment, rolling moment, and yawing moment. Angle of attack was measured
visually by means of a cathetometer.
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Sutton, Fred B. & Buell, Donald A. The Effect of an Operating Propeller on the Aerodynamic Characteristics at High Subsonic Speeds of a Model of a Vertical-Rising Airplane Having an Unswept Wing of Aspect Ratio 3, report, November 15, 1954; (https://digital.library.unt.edu/ark:/67531/metadc59185/m1/5/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.