Effects of wing elasticity on the aerodynamic characteristics of an airplane configuration having 45 degrees sweptback wings as obtained from free-flight rocket-model tests at transonic speeds Page: 2 of 50
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1F NACA RM L52L30
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
EFFECTS OF WING ELASTICITY ON THE AERODYNAMIC
CHARACTERISTICS OF AN AIRPLAlNE CONFIGURATION HAVING
45 SWEPTBACK WINGS AS OBTAINED FROM FREE-FLIGHT
ROCKET-MODEL TESTS AT TRANSONIC SPEEDS
By A. James Vitale
Flight tests at transonic speeds have been made of two rocket-
propelled models of an airplane configuration having 450 sweptback wings
of aspect ratio 4 and with different stiffnesses. The longitudinal sta-
bility, lift, and drag characteristics were determined by analysis of
the response of the models to disturbances in pitch. A comparison was
made between experimental and calculated effects of aeroelasticity on
lift and longitudinal stability.
A straight-line extrapolation of the lift-curve slopes of the two
wings of different stiffness to obtain the rigid-wing lift-curve slope
was found to be satisfactory in the range of wing stiffness tested. The
loss in lift-curve slope of the more flexible wing found experimentally
agreed fairly well with that calculated by a modified strip-theory method.
A combination of the effects of a high-tail position and an unstable
pitching-moment curve of the wing at high lift coefficients and tray
sonic speeds caused both models to execute a violent pitch-up maneuver.
The induced drag parameter dCD/dCL2 was found to be nonlinear with
lift coefficient and the model having the more flexible wing had lower
drag due to lift over the Mach number range of 0.97 to 1.30.
The results presented in this paper are part of a general research
program utilizing rocket-propelled models to investigate the effect of
wing plan form on transonic and supersonic longitudinal stability, lift,
and drag characteristics. Previous models tested have included several
thin straight wings and triangular wings (refs. i to 6). All the models
tested have had similar fuselage and tail surfaces. The ving-off charac-
teristics of the models tested are presented in reference 2.
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Vitale, A. James. Effects of wing elasticity on the aerodynamic characteristics of an airplane configuration having 45 degrees sweptback wings as obtained from free-flight rocket-model tests at transonic speeds, report, January 28, 1953; (digital.library.unt.edu/ark:/67531/metadc59504/m1/2/: accessed January 21, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.