Characteristics throughout the subsonic speed range of a plane wing and of a cambered and twisted wing, both having 45 degrees of sweepback Page: 2 of 124
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A R M D3 1176 01425 9296
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
CHARACTERISTICS THROUGHOUT TEE SUBSONIC SPEED IRAGE OF
A PIANE WING AND OF A CAMBERED AND TWISTED WING,
BOT HAVING 450 OF SWEEPBACK
By Ben H. Johnson, Jr., and Harry H. Shibata
* A wind--tunnel investigation has been made of two semispan wing
models having 450 of sweepback, an aspect ratio of 5, and a taper ratio
of 0.565. One wing had no camber or twist and the other wing was
. cambered for a design lift coefficient of 0.4 and twisted to relieve
the loading at the tip which accompanies sweepback. The airfoil sections
normal to the quarter-chord line were the NACA 64A010 for the plane wing
and the NACA 64A810 for the cambered and twisted wing. The cambered and
twisted wing had 8.70 of washout between the root and the tip. The tests
were made at Mach numbers from 0.25 to 0.94. At each Mach number the .
Reynolds number was varied over as wide a range as possible within the
limitations of wind--tunnel power and wind-tunnel pressure. At Mach num-
bers above 0.70, the maximum Reynolds number was 2,000,000; at a Mach
number of 0.25, the maximum Reynolds number was 10,000,000. The effects
of a fuselage, of boundary-layer fences, and of surface roughness were
At a Reynolds number of 10,000,000 and a Mach number of 0.25, the
combined camber and twist were effective in delaying extensive separation
on the wing to a higher lift coefficient. At the lower Reynolds numbers,
the effectiveness of camber and twist in delaying extensive separation
was seriously reduced. The aerodynamic characteristics of both wings
were seriously influenced by dynamic-scale effects.
At Mach numbers greater than 0.70, wilnd-tunnel power limitations
prevented testing at Reynolds 'numbers greater than 2,000,000. Because
of the large dynamic-scale effects previously noted, direct application
of these data to the design of airplanes which operate at substantially
higher Reynolds numbers is not recommended. Based on the data obtained
at a Reynolds number of 2,000,000, the combined camber and twist improve
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Johnson, Ben H , Jr & Shibata, Harry H. Characteristics throughout the subsonic speed range of a plane wing and of a cambered and twisted wing, both having 45 degrees of sweepback, report, July 12, 1951; (digital.library.unt.edu/ark:/67531/metadc58856/m1/2/: accessed March 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.