Low-lift drag and stability data from rocket models of a modified-delta-wing airplane with and without external stores at Mach numbers from 0.8 to 1.36 Page: 2 of 44
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NACA RM L53A27
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
LOW-LIFT DRAG AND STABILITY DATA FROM ROCKET CDELS
OF A lODIFIED-DELTA-WING AIRPANE WITH AND
WITHOUT EXTERNAL STORES AT MACH
NUMBERS FROM 0.8 TO 1.36
By Grady L. Mitcham and Willard S. Blanchard, Jr.
A flight investigation has been made to determine the drag and sta-
bility at low lift coefficients of models of a modified-delta-wing air -
plane at Mach numbers from 0.8 to 1.36 and a Reynolds number range from
about 7 x 106 to 17 x 106 . Included herein is a summary of the drag and
stability data determined from these tests.
The drag break occurred at a Mach number of approximately 0.93 for
the configurations tested. The external drag coefficient for the clean
configuration was a constant value of about 0.010 at subsonic speeds and
increased to about 0.038 at supersonic speeds. The addition of four
rocket packets to the basic model resulted in very little increase in
external drag coefficient. The addition of two external stores in com-
bination with the four rocket packets, however, resulted in an increase
in external drag coefficient of about 0.005 at subsonic speeds and 0.010
at supersonic speeds.
The transonic trim change, a pitching-up tendency, was mild. The
slope of the lift curve varied smoothly throughout the Mach number range
covered. The damping in pitch was low throughout the test Mach number
range. The losses in duct total-pressure recovery between Mach numbers
of 0.8 and 1.3 were small.
As a result of the current interest in the use of various triangular-
wing plan forms for aircraft designed to fly at transonic and supersonic
speeds, the National Advisory Committee for Aeronautics is conducting,
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Mitcham, Grady L. & Blanchard, Willard S., Jr. Low-lift drag and stability data from rocket models of a modified-delta-wing airplane with and without external stores at Mach numbers from 0.8 to 1.36, report, March 26, 1953; (digital.library.unt.edu/ark:/67531/metadc59563/m1/2/: accessed May 28, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.