Free-spinning-tunnel investigation to determine the effect on spins and recoveries of wing leading-edge chord-extensions and drooped leading-edge flaps on scale models of two sweptback-wing fighter airplanes Page: 4 of 30
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CA RM Li&CP6
inertia rolling-moment parameter
Iz - Xx
inertia pitching-moment parameter
p air density, slugs/cu ft
relative density of airplane, /pSb
.a angle between fuselage reference line and vertical (approx-
ximastely equal, to the true angle of attack at plane of
A angle between span axis and horizontal, deg
V full-scale true rate of descent, ft/see
full-sIea~c angular velocity abut spin axis rps
,, ro , pitch and yaw moment s respectively, about body
PARATUS AlD METHODS
The to models used for threpresent investigation were constructed
principally of balsa4 The chorde-extension n were formed by fairing
eircular-are extensions of thin aluminum sheet from a point ahead of
e wing t point of maximum thkes on the airfoil The models
are considered as representative of current swept-wiug fighter airplanes,
model A being considered a l/24-scale model, and model B,' a /25-scale
model Th.ree-view drawings of models A and B are shown as figures L
and j, respect e three ndroopd chrS .' ..-exten. ..sion.. investigated.
on model A are shown in figure 4 and t drooped chord-extensions inves-
ti gated in combine ntin with the drooped leading-edge flaps are shown in
figure 5 (chard-extensions and leading-edge flaps defleet the same
.amount) Figure illustrates the chord-extension (undrooped) invest
gated on model. B The geometric U ..araterstics of the models scaled
up to airplane values are presented in table I
Model A was bal lasted to obtain cynmlc similarity to an airplane
at an arbitrary altitude of 20,000 feet (p 0.001267 slug/cu ft)
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Wilson, Jack H. & Klinar, Walter J. Free-spinning-tunnel investigation to determine the effect on spins and recoveries of wing leading-edge chord-extensions and drooped leading-edge flaps on scale models of two sweptback-wing fighter airplanes, report, May 6, 1953; (digital.library.unt.edu/ark:/67531/metadc59729/m1/4/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.