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• August 30, 2016 Create Date
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National Advisory Committee for Aeronautics, Report - Wind Tunnel Investigation of Spoiler, Deflector, and Slot Lateral Control Devices on Wings with Full Span Split and Slotted Flaps

An extensive incestigation was made in. the NACA
’r"- by 10-foot wind tunnel of spoiler, deflector, and slot
types of lateral-control device on wings with full-span split
and slotted flaps. The static rolling and yawing moments
were determined for all the devices tested, and the static
hinge moments and the time response were determined for
a few devices of each type.

Spoilers alone on the wing upper surface were unsatis-
factory unless located near the trailing edge. Deflectors
(lower-surface devices) appeared to hate insuficient power
when operating alone but were beneficial in combination
with spoilers. A slot between thespoiler and the deflector
further increased their efecticeness, but the combinations
tested did not have satisfactory hinge-moment character-
istics. A plug-type spoiler-slot aileron appeared to be the
most satisfactory device investigated for use with afnll-span
slotted flap.

The improved characteristics of high-lift devices and
the high wing loadings of modern airplanes have indi-
cated the need of employing such devices over the entire
wing span to improve the take-off and the landing
characteristics. If full—span trailing—edge high—lift de-
vices are used, however, some lateral—control device
other than the plain trailing-edge aileron becomes neces-
sary. Many devices have been investigated by the
NACA (reference 1), among which were a few ar-
rangements suitable for application to wings with full-
span high—lift devices. Up to the present time, none of
these arrangements seems to have been accepted as
generally satisfactory.

Several lateral—control devices of the spoiler type
have been investigated by the NACA because
spoilers permit the use of the entire trailing edge for
flaps of various kinds. Some devices of this type have
acceptable static characteristics on plain wings but are
unsatisfactory because of an appreciable time delay
betWeen the movement of the control surface and the
development of the resulting rolling moment.