The effect of ground on the low-speed aerodynamics control, and control hinge-moment characteristics of a delta-wing-fuselage model with trailing-edge controls Page: 3 of 54
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NACA RM L5B 03
equipped with trailing-edge controls. The configuration, which had
already been studied in some detail (ref. 3), had a 3-percent-thick wing
equipped with inboard trailing-edge flaps and outboard horn-balance-type
The tests were made in the presence of a ground board in the Langley
full-scale tunnel. They included the longitudinal characteristics of the
model and the control and control hinge-moment characteristics of
trailing-edge flaps and horn-balance-type ailerons with areas of 10.8
and 10.2 percent total wing area, respectively. Forces and moments as
well as control hinge moments were obtained in the angle-of-attack range
from -3.7o through the angle for maximum lift at several ground heights.
The test Reynolds number was 2.5 x 106 and the Mach number was 0.10.
COEFFICIENTS AND SYMBOLS
All results are presented in standard NACA form of coefficients of
forces and moments. Wing forces and moments are referred to the stability
axes originating at the projection of the quarter-chord point of the mean
aerodynamic chord on the plane of symmetry. The positive directions of
forces, moments, and angles are shown in figure 1.
CL lift coefficient,
CD drag coefficient, r
Cm pitching-moment coefficient, Pitching moment
Cn yawing-moment coefficient, Yawing moment
C1 rolling-moment coefficient, Rolling moment
Ch hinge-moment coefficient, Hinge moment
CLmax maximum lift coefficient
u local velocity on surface, ft/sec
H hinge moment, ft-lb
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Scallion, William I. The effect of ground on the low-speed aerodynamics control, and control hinge-moment characteristics of a delta-wing-fuselage model with trailing-edge controls, report, September 24, 1954; (https://digital.library.unt.edu/ark:/67531/metadc60676/m1/3/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.