Free-Spinning-Tunnel Investigation of a 1/28-Scale Model of the North American FJ-4 Airplane Page: 3 of 28
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INTRODUCTION
At the request of the Bureau of Aeronautics, Department of the Navy,
an investigation has been made of a 1 28-scale model of the North American
FJ-4 airplane in the Langley 20-foot free-spinning tunnel. The FJ-4 air-
plane is a jet-propelled, low swept-wing, single-seat fighter airplane.
The erect spin and recovery characteristics of the model were deter-
mined for the basic design combat gross-weight condition (60 percent wing
fuel), for this loading with all wing fuel removed, and for a loading
indicated as representing a revised combat gross-weight condition (80 per-
cent wing fuel plus spin-recovery rockets). In addition, the effect of
deflecting leading-edge flaps or extending speed brakes on erect spins
in the basic design combat gross-weight condition was investigated.
Inverted spin and recovery characteristics of the model were determined
for the revised design combat gross-weight condition, for an accident-
test loading which simulated the loading of an airplane which crashed
during the full-scale flight test program, and for this latter loading
with emergency wing-tip spin-recovery rockets added. The size of spin-
recovery tail parachute necessary to insure satisfactory spin recovery
was determined, and the effect of firing wing-tip rockets during spins
was investigated.
General descriptions of model-testing techniques, methods of inter-
preting test results, and correlation between model and airplane results
are presented in reference 1.
SYMBOLS
b wing span, ft
c mean aerodynamic chord, ft
cn yawing-moment coefficient, Yawing moment
qS
IX, Iy,I z moments of inertia about X, Y, and Z body axes, respectively,
slug-ft2
IX - Iy
2 inertia yawing-moment parameter
mb
Iy - IZ
2 inertia rolling-moment parameter
mb2_ __
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Healy, Frederick M. Free-Spinning-Tunnel Investigation of a 1/28-Scale Model of the North American FJ-4 Airplane, report, January 13, 1958; (https://digital.library.unt.edu/ark:/67531/metadc53107/m1/3/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.