Control Effectiveness Load and Hinge-Moment Characteristics of a Tip Control Surface on a Delta Wing at a Mach Number of 1.9 Page: 3 of 43
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TECH LIBRARY KAFB, NM
NACA RM L9EO5 0 37 8
NATIONAL ADVISORY COMMTEE FOR AERONAUTICS
CONTROL EF ~CTIVENESS LOAD AND aINGE-MOMEN
CHARACTERISTICS OF A TIP CONTROL SURFACE
ON A IELTA WING AT A MACH NUMBER OF 1.9
By D. William Conner and Ellery B. May, Jr.
A wind-tunnel investigation was made of a semispan delta wing
having the leading-edge swept back 600. A half-delta control surface,
which made up the outer one-third of the exposed wing span, was hinged
about an axis perpendicular to the streamwise parting line separating
the control. Tests were made with and without a fence attached to the
inner wing panel at the parting line. Two controls were tested which
differed only in airfoil section. In addition to determining the charac-
teristics of the complete configuration, loads were measr ed on the con-
trol surface alone. The test Reynolds number was 4 x 10 and the free-
stream Mach number was 1.9.
The experimental rolling effectiveness of the control surface
amounted to about 85 percent of that calculated by linearized theory.
At zero angle of attack of the wing, the normal-force and moment charac-
teristics of the control were reasonably well predicted by linearized
theory. At low angles of attack, the control-surface hinge moment
exhibited considerable nonlinear variations with control deflection and
with angle of attack. Installation of the fence caused no significant
changes in the aerodynamic characteristics of the model. Increasing the
leading-edge bluntness of the control surface decreased the rolling
effectiveness andcaused no change in the hinge-moment characteristics.
Control surfaces which extend to the wing leading edge have been
found to be highly effective from subsonic speeds to moderate supersonic
speeds. (See reference 1.) Such types of full-chord controls appear to
have none of the reversals in effectiveness at transonic speeds which
characterize some trailing-edge flaps, probably because the effectiveness
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Conner, D. William & May, Ellery B., Jr. Control Effectiveness Load and Hinge-Moment Characteristics of a Tip Control Surface on a Delta Wing at a Mach Number of 1.9, report, October 7, 1949; (https://digital.library.unt.edu/ark:/67531/metadc58388/m1/3/: accessed May 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.