Transonic Investigation of the Effectiveness and Loading Characteristics of a Flap-Type Aileron With and Without Paddle Balances of an Unswept-Wing-Fuselage Model Page: 2 of 42
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NAA Tec ibra -
NACA BYM L56B02 3 1176 01437 7643
NATIONAL ADVISORY COIMIITEE FOR AERONAUTICS
TRANSONIC INVESTIGATION OF THE ET 'ECTIVENESS AND
LOADING CHARACTERISTICS OF A FLAP-TYPE AILERON
WITH AND WITHOUT PADDLE BALANCES ON
AN UNSWEPT-WING--FUSELAGE MODEL
By C-erald Hieser
An investigation has been conducted at the Langley 16-foot tran-
sonic tunnel for the purpose of investigating the effectiveness and
loading characteristics of an aileron mounted on an unswept-wing--body
configuration. The flap-type outboard aileron was tested with and with-
out paddle balances at Mach numbers from 0.70 to 1.05 and angles of attack.
from 00 to 140. The test Reynolds number, based on wing mean aerodynamic
chord, varied from about 5.5 x 10 to 6.5 x 106.
Results of the investigation indicate that with increasing Mach num-
ber at an angle of attack of 00, the aileron effectiveness is nearly con-
stant until a Mach number of 0.94 is reached, after which a rapid decrease
in effectiveness occurs. At Mach numbers from 0.98 to 1.05, the paddle
balances reduce the aileron hinge-moment coefficient by about 22 percent
at an angle of attack of 00. The largest increase in drag coefficient
due to addition of paddle balances to one aileron amounts to about 0.002.
Because theory for predicting effectiveness and loading character-
istics of lateral controls is inadequate at transonic speeds, recourse
must be made to experimental research to supply such information. Accord-
ingly, some lateral control investigations at transonic speeds have been
conducted by the NACA on small-scale models by utilizing the transonic
bump and wing flow techniques (see, for example, refs. 1 to 3).
A program is now in progress at the Langley 16-foot transonic tunnel
for the purpose of obtaining the effectiveness and loading of controls
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Hieser, Gerald. Transonic Investigation of the Effectiveness and Loading Characteristics of a Flap-Type Aileron With and Without Paddle Balances of an Unswept-Wing-Fuselage Model, report, April 13, 1956; (https://digital.library.unt.edu/ark:/67531/metadc62297/m1/2/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.