Wind tunnel tests of an NACA 23021 airfoil equipped with a slotted extensible and a plain extensible flap Page: 2 of 11
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
TECHNICAL NOTE NO. 782
WIND-TUNNEL TESTS OF AN NASA 23021 AIRFOIL EQUIPPED WITH
A SLOTTED EXTENSIBLE AND A PLAIN EXTENSIBLE FLAP
3y Thomas A. Harris and Robert S. Swanson
S U1MMARY
An investigation has been made in the. NACA 7- by lo-
foot wind tunnel of a large-chord NACA 23021 airfoil
equipped with two arrangements of a completely extended
15-percent-chord extensible flap. One of the flaps had a
faired juncture, without a gap; the other was provided
with a slot between the trailing edge of the airfoil and
the nose of the flap. Complete aerodynamic section char-
acteristics are presented for the various flap deflections
for both flap arrangements in the completely extended po-
sition.
The results showed that the basic airfoil gave the
lowest profile-drag coefficients over the low lift range,
the airfoil with the plain extensible flap gave the lowest
profile-drag coefficients over the moderate lift range,
and the airfoil with the slotted extensible flap _ave the
lowest profile-drag coefficients over the high lift range.
The airfoil with the slotted extensible flap had the same
maximum lift at a flap deflection of 250 as the airfoil
with the plain extensible flap had at a flap deflection
of 600.' The results of comparisons of the airfoil pitching-
moment coefficients obtained with the two types of flap
are dependent upon the basis chosen for conmp.rison.
INT-RODUCT I 0N
The National Advisory Committee for Aeronautics has
undertaken an extensive investigation of various win-
flap combinations to furnish information applicable to the
aerodynamic design of high-lift devices for improving the
safety and the performance of airplanes. .Two characteris-
tics of high-lift devices considered desirable are high
lift with variable drag for lapdip and high lift with low
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Swanson, Robert S. & Harris, Thomas A. Wind tunnel tests of an NACA 23021 airfoil equipped with a slotted extensible and a plain extensible flap, report, November 1940; (https://digital.library.unt.edu/ark:/67531/metadc54616/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.