Investigation at low speeds of deflectors and spoilers as gust alleviators on a model of the Bell X-5 airplane with 35 degree swept wings and on a high-aspect-ratio 35 degree swept-wing-fuselage model Page: 2 of 38
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
TECHNICAL NOTE 4057
INVESTIGATION AT LOW SPEEDS OF DEFLECTORS AND SPOILERS ASGOE
GUST ALLEVIATORS ON A MODEL OF TEE BELL X-5 AIRPLANE
WITH 53o50 SWEPT WINGS AND ON A HIGH-ASPECT-RATIO
350 SWEPT-WING--FUSELAGE MODEL
By Delwin R. Crocn and Jarrett K. Huffman
An investigation was made at low speeds in the Langley 5300 MPH 7-
by 10-foot tunnel to determine the gust-alleviation capabilities (reduc-
tion in lift-curve slope) of spoilers and deflectors on a high-aspect-
ratio 350 swept-wing--fuselage model and a 1/4-scale model of the Bell
X-5 airplane with 350 swept wings.
The results indicate that deflector and spoiler-deflector types of
controls can be designed to provide considerable gust alleviation for a
swept-wing airplane while still maintaining stability and control.
Results reported in reference 1 showed that spoilers and deflectors,
when mounted near the leading edge of the unswept wing of a transport
model, were effective in reducing the normal acceleration due to gusts
by reducing the lift-curve slope. It was anticipated that this type of
control would be extended when rough air was encountered by a transport
airplane and remain extended as long as the airplane remained in rough
air. The investigation has been extended in this report to include
similar devices on swept wings.
A preliminary series of tests, referred to in reference 1, was made
on a wing with an aspect ratio of 8.55 and 34.90 of sweep (referred to
the unswept-wing quarter-chord line). The results indicated that the
devices should be placed farther back on a swept wing than on the unswept
wing model of reference 1 and might require ventilation from the lower
to the upper wing surface. Several of the more effective configurations
found in these preliminary tests were incorporated in the investigation
of the high-aspect-ratio model and the 1/4-scale model of the Bell X-5 air-
. plane with the wings swept back 55o
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Croom, Delwin R. & Huffman, Jarrett K. Investigation at low speeds of deflectors and spoilers as gust alleviators on a model of the Bell X-5 airplane with 35 degree swept wings and on a high-aspect-ratio 35 degree swept-wing-fuselage model, report, June 1957; (digital.library.unt.edu/ark:/67531/metadc56647/m1/2/: accessed January 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.