Wind-tunnel tests of the Fowler variable-area wing Page: 2 of 19
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NATIONAL ADVIS ORY COMMITTEE FOR'AERONAUTICS
TECHNICAL NOTE NO. 419
- WIND-TUNNEL TESTS OF THE BOWLER VARIABLE-AREA WING
By Fred E. Weick and Robert C. Platt
The lift, drag, and center of pressure characteris-
tics of a model of the Fowler variable-area wing.were
measured in the N.A.C.A. 7 by 10 foot Wind tunnel. The
Fowler wing consists of a combination of a main wing and
an extension surface, also of airfoil section. The exten-
sion surface can be entirely retracted within the lower
rear portion of the main wing or it can be moved to the
rear and downward. The tests were made with the nose
of. the extension airfoil in various positions near the
trailing edge of the main wing and with the surface at
various angular deflections. The highest lift coefficient
obtained was OL = 3.17 as compared with 1.27 for the'
main wing alone.
INTRODUCTION
The Bowler wing, developed by Harlan D. owler, is
the result of an attempt to combine three different meth-
ods of increasing the maximum lift.
1. Increasing the area by means of an exten-
sion surface.
2. Increasing the effective camber by means of
a flap.
3. Providing a slot to help maintain unburbled
flow at high angles of attack.
*The combining of these methods -is'accomplished. by means
of an extension surface, which l 1 a sort of flap having
an airfoil section. The extension airfoil is retracted
into the lower rear portion of the wing when not in use
but isextended to the rear and downward when high lift
is desired. (Fig, 1.) The gap that is left between the
main wing and the extension airfoil forms a slot to main-
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Weick, Fred E. & Platt, Robert C. Wind-tunnel tests of the Fowler variable-area wing, report, May 1932; (https://digital.library.unt.edu/ark:/67531/metadc54106/m1/2/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.