The Effects of Extensible Rocket Racks on Lift, Drag, and Stability of a 1/10-Scale Rocket-Boosted Model of the McDonnell XF3H-1 Airplane for a Mach Number Range of 0.60 to 1.34 : TED No. NACA DE 31 Page: 6 of 43
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NACA RM SL53F15 a 5
* *
'.@..'l jet exit. The center of gravity was at 28.5 percent of the mean aero-
**"** dynamic chord and 0.012 chord length above the model center line. The
horizontal stabilizer was fixed at -5.91 relative to the wing chord
"* * plane. Table I lists the pertinent physical properties and dimensions
.,. of the model. Briefly, the model construction was as follows: wing -
*" laminated mahogany and aluminum-alloy spar and trailing-edge insert,
fuselage - semimonocoque with aluminum-alloy skin and steel and aluminum-
alloy bulkheads, horizontal and vertical stabilizers - solid-aluminum
alloy, and canopy and fairings - laminated and solid mahogany finished
with clear lacquer.
Rocket Racks
The rocket-rack configuration tested is shown in figure 3. The
frontal area of both racks, when extended by rotating through an angle
of 114.30 was 0.022 square foot. Other pertinent dimensions are given
in figure 3. A hydraulically operated pulse system extended and retracted
the racks in an approximate square wave motion. The time to extend the
racks was generally 0.046 second, whereas the time to retract was longer,
about 0.080 second. Photographs of the underside of the model with racks
fully retracted and extended are shown in figure 4.
Instrumentation
The model carried a ten-channel telemeter which transmitted contin-
uous records of the acceleration normal to the wing chord plane at the
center of gravity and at the tail, the acceleration parallel to the wing
chord plane near the center of gravity, the transverse acceleration,
angle of attack relative to the fuselage center line, rocket-rack posi-
tion, total pressure measured on the left wing tip and in the right inlet,
and base pressure measured behind the angle-of-attack vane (calibrated
to give atmospheric static pressure) and in the fuselage jet exit. The
arrangement of the accelerometers is shown in figure 5 and the points at
which the pressures were measured are shown in figure 1.
Photography, an SCR 584 radar set, and the CW Doppler velocimeter
were used to observe the first part of the flight. After the flight had
taken place, a radiosonde was released to determine atmospheric static
temperature and pressure.
PROCEDURE
Before flying, the model was mechanically vibrated to determine the
resonant frequencies and node lines (see fig. 5) of its major components.
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Crabill, Norman L. The Effects of Extensible Rocket Racks on Lift, Drag, and Stability of a 1/10-Scale Rocket-Boosted Model of the McDonnell XF3H-1 Airplane for a Mach Number Range of 0.60 to 1.34 : TED No. NACA DE 31, report, June 16, 1953; (https://digital.library.unt.edu/ark:/67531/metadc59639/m1/6/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.