Spinning characteristics of wings 4: changes in stagger of rectangular Clark Y cellules Page: 3 of 29
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N.A.C.A. Technical Note No. 625
In order to provide necessary aerodynamic data for es-
timating airplane spinning characteristics from the design
features, the N.A.C.A. is conducting an investigation to
determine the aerodynamic characteristics of airplane mod-
els and parts of airplane models in spinning attitudes.
The portion of the investigation to determine the
spinning characteristics of wings, for which the N.A.C.A.
spinning balance is being used, includes a study of the ef-
fects of variations in airfoil section, plan form, and tip
shape of monoplane wings and variations in stagger for bi-
plane cellulos, The first and third series of tests re-
ported were made of Clark Y monoplane wings with rectangu
lar plan forms, with square and rounded tips, and with a
5:2 tapered wing having rounded tips (references 1 and 2).
The second series, made of a rectangular Clark Y biplane
cellulo with 0.25 stagger, is reported in reference 3.
The present report is a continuation of reference 3
and gives the aerodynamic characteristics., in spinning at-
titudes, of a rectangular Clark Y biplane cellule with the
gap equal to the chord, zero decalage, and with zero and
-0.25 stagger. Also included are comparisons with. the
cellule having 0.25 positive stagger.
APPARATUS AND MODELS
The tests were made on the spinning balance in the
N.A.C.A, 5-fobot vertical wind tunnel. The tunnel is de-
scribed in reforonce 4 and the six-component spinning bal-
ance in reference 5.
The Clark Y wings were made of laminated mahogany
with balsa insets for lightness. *The span of each wing is
30 inches and the chord is 5 inches. These wings had been
used for the tests in reference 3; the only change in the
cellule was new strut bracing to give the desired amounts
of stagger. Figure 1 is a sketch of the model showing the
bracing, balance attachment, and stagger. Figure 2 shows
the model (-0.25 stagger) mounted on the spinning balance.
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Bamber, M. J. & House, R. O. Spinning characteristics of wings 4: changes in stagger of rectangular Clark Y cellules, report, December 1937; (digital.library.unt.edu/ark:/67531/metadc54396/m1/3/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.