High-Speed Wind-Tunnel Tests of a 1/16-Scale Model of the D-558 Research Airplane: D-588-1 Speed-Reduction Brake and Symmetrical-Profile Wing Characteristics Page: 2 of 23
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NACA RM No. L8B06 CONFIDENTIAL 0143966
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
RESEARCH MEMORANDUM
HIGH-SPEED WIND-TUNNEL TESTS OF A t-SCALE MODEL
16
OF TEE D-558 RESEARCH AIRPLANE
D-558-1 SPED-REDUCTION BRAKE AND SYMMETRICAL-
PROFI7 WING CHARACTERISTICS
By John B. Wright
SUMMARY
The present paper contains the results of pitching-moment, lift,
and drag measurements with a 1-scale model of the D-558-1 with speed-
reduction brakes and with a wing of symmetrical profile. Tests were
conducted through a Mach number range up to 0.96 in the Langley 8-foodt
high-speed tunnel. In order to expedite this information, only a
limited analysis is presented.
It was found that drag increases caused by the brakes produce a
small decrement in terminal Mach number. No serious adverse longitudinal-
stability changes were noted.
From tests with the model without brakes using a wing with
NACA 65-010 sections, it is indicated that the adverse stability charac-
teristics which were found with a wing of NACA 65-110 sections were not
improved by the use of the symmetrical-profile wing.
INTRODUCTION
The D-558-I is a research airplane designed to investigate aero-
dynamic phenomena in the transonic speed range. It is designed to fly at
a level-flight Mach number of 0.85 and is powered by a turbojet unit. It
has an unawept wing of aspect ratio 4.17 in a low position on the
fuselage.
Wind-tunnel tests of a -scale model were conducted up to high
Mach numbers in the Langley 8-foot high-speed tunnel in order to provide
preflight information for the pilot to insure against any catastrophic
events due to compressibility effects during flight. Speed-reductionbrakes on the fuselage sides are contemplated for the purpose of rapid
speed reduction if adverse regions are encountered at high speeds.CONFIDENTIAL
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Wright, John B. High-Speed Wind-Tunnel Tests of a 1/16-Scale Model of the D-558 Research Airplane: D-588-1 Speed-Reduction Brake and Symmetrical-Profile Wing Characteristics, report, June 15, 1948; (https://digital.library.unt.edu/ark:/67531/metadc57544/m1/2/: accessed April 20, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.