Aerodynamic characteristics of several flap-type trailing-edge controls on a trapezoidal wing at Mach numbers of 1.61 and 2.01 Page: 2 of 69
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TECH LIBRARY KAFB, NM
NACA RM L4D19 aIINmII
0144326
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
RESEARCH MEMORANDUM
AERODYNAMIC CHARACTERISTICS OF SEVERAL FLAP-TYPE
TRAILING-EDGE CONTROLS ON A TRAPEZOIDAL WING
AT MACH NUMBERS OF 1.61 AND 2.01
By Douglas R. Lord and K. R. Czarnecki
SUMMARY
An investigation has been made at Mach numbers of 1.61 and 2.01 for
a range of Reynolds number from 1.7 X 106 to 5.6 x 106 to determine the
control effectiveness and hinge-moment characteristics for a series of
25.4-percent-chord trailing-edge controls on a trapezoidal wing having a
230 sweptback leading edge, aspect ratio of 3.1, and taper ratio of 0.4.
Pressure-distribution and hinge-moment measurements were made at angles
of attack from 00 to 150 for control deflections from -300 to 300
Integrated pressure-distribution results and hinge-moment results
show that the linear theory overestimated the effect of control deflec-
tion. The linear theory predicted well the effect of wing angle of attack
on the wing characteristics, but overestimated the effect on the control
hinge moments. Modifying the linear-theory method to account for the wing
thickness improved the theoretical predictions. The effect of Reynolds
number on the control effectiveness and hinge-moment parameters was small
for the range tested and the changes with Mach number were the same or
somewhat less than predicted theoretically. Increasing the hinge-line
gap caused numerical increases in all parameters measured, as did
increasing the control trailing-edge thickness on the full-span control.
Correlations were obtained, both theoretically and experimentally,
showing the wing lift, root bending-moment, and pitching-mment effec-
tiveness to be functions primarily of control area, control-area moment
about the wing root, and control-area moment about the pitch center,
respectively.vio
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Lord, Douglas R. & Czarnecki, K. R. Aerodynamic characteristics of several flap-type trailing-edge controls on a trapezoidal wing at Mach numbers of 1.61 and 2.01, report, June 14, 1954; (https://digital.library.unt.edu/ark:/67531/metadc60498/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.