Low-speed longitudinal aerodynamic characteristics of a twisted and cambered wing of 45 degree sweepback and aspect ratio 8 with and without high-lift and stall-control devices and a fuselage at Reynolds numbers from 1.5 x 10(exp 6) to 4.8 x 10(exp 6 Page: 3 of 78
This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
NACA RM L52C11
INTRODUCTION -
As part of.a broad program to investigate the low-speed aerodynamic
characteristics of sweptback wings, the static longitudinal stability
characteristics of a 45 sweptback wing of aspect ratio 8.0 were inves-
tigated in the Langley 19-foot pressure tunnel. The results are reported
in references 1 to 3. Although a wing of such plan form is basically
very unstable at moderate and high lift coefficients, it was pointed
out in reference 1 that longitudinal stability could be obtained from
the use of stall-control devices'.
More recently, consideration has been given to the use of camber
and twist variations along the span as a means of counteracting the
undesirable induced effects of .sweepback. Camber and twist-also provide .
additional advantages, if properly applied, in that-both the-profile and
induced drag would be reduced for high design-lift coefficients.
With these considerations in mind, an experimental. investigation
was conducted to determine the low-speed longitudinal characteristics of -waf
a 450 sweptback wing of aspect ratio 8.0, which was cambered and twisted
to provide an elliptical spanwise load distribution ata design lift
coefficient of-0.7 and a Mach number of 0.9. The plan form of the present
wing was similar to the plan form of the wing reported in references 1
to- 3, which had no camber or ..twist.
The present paper contains the results of force tests to determine
the effects. of high-lift and stall-control devices on the cambered and
twisted wing. The investigation was conducted at Reynolds numbers
ranging from 1.5 06 tp 4.8 x 10 .
SYMBOLS -
All.forces and moments are referred to a point 9.34 percent of-the
mean aerodynamic chord above the quarter-chord point of the mean aero-
dynamic chord projected to the plane of-symmetry.
A aspect ratio
a - speed of sound
b wing span
c wing chord
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Salmi, Reino J. Low-speed longitudinal aerodynamic characteristics of a twisted and cambered wing of 45 degree sweepback and aspect ratio 8 with and without high-lift and stall-control devices and a fuselage at Reynolds numbers from 1.5 x 10(exp 6) to 4.8 x 10(exp 6, report, June 11, 1952; (https://digital.library.unt.edu/ark:/67531/metadc59196/m1/3/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.