Hinge-Moment and Other Aerodynamic Characteristics at Transonic Speeds of a Quarter-Span Spoiler on a Tapered 45 Degree Sweptback Wing of Aspect Ratio 3 Page: 2 of 24
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NACA BR L52A03
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
-- SA TechnicLUt
3 1176 01437 0572
HINGE-MCENT AND OTHER AERODYNAMIC CHARACTERISTICS AT
TRANSONIC SPEEDS OF A QUARTER-SPAN SPOILER ON A
TAPERED 450 SWEPTBACK WING OF ASPECT PATIO 3
By Joseph E. Fikes
SUMMARY
An investigation was made at transonic speeds in the Langley high-
speed 7- by 10-foot tunnel to determine the hinge-moment and other aero-
dynamic characteristics of an inboard plug-type spoiler on a 40 swept-
back wing of aspect ratio 3. Transonic speeds were obtained by testing
in the high velocity field over a reflection plane on the side wall of
the tunnel.
The results of the investigation indicated that the spoiler would
be overbalanced at low projections (+2 percent chord) through the speed
range investigated and that for the same rolling moment the spoiler
hinge moments would be small in comparison with those of a plain-flap-
type control. At high angles of attack, the spoiler became ineffective
in producing changes in lift and rolling moment.
INTRODUCTION
High-speed flight has brought forth many serious control problems;
one of these problems is that of overcoming large control forces. This
problem has been partially taken care of by the use of mechanical power
boost systems incorporated into the control system of the aircraft.
Although, mechanical boost systems have proven to be fairly satisfactory)
a manually operated control system still remains desirable for many
reasons, such as, weight saving, simplicity, and greater safety. To
obtain manually operated controls requires either that a means be found
to aerodynamically balance conventional controls or that controls having
inherently low hinge moments be used.
From a study made by the NACA during the past decade, the spoiler
appears to offer possibilities as a manual lateral-control device
UNCLASSIFIED
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Fikes, Joseph E. Hinge-Moment and Other Aerodynamic Characteristics at Transonic Speeds of a Quarter-Span Spoiler on a Tapered 45 Degree Sweptback Wing of Aspect Ratio 3, report, February 26, 1952; (https://digital.library.unt.edu/ark:/67531/metadc59137/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.