The Effects at a Mach Number of 6.86 of Drag Brakes on the Lift, Drag, and Pitching Moment of an Ogive Cylinder Page: 2 of 32
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TECH LIBRARY KAFB, NM
NACA RM L55K2 88
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
RESEARCH MEMORANDUM
THE EFFECTS AT A MACH NUMBER OF 6.86 OF DRAG BRAKES
ON THE LIFT, DRAG, AND PITCHING MOMENT
OF AN OGIVE CYLINDER
By Jim A.;,Penland and David E. Fetterman, Jr.
SUMMARY
Results are presented of three-component force tests of a cylindrical
body with an ogival nose equipped with panel-type drag brakes each
covering approximately 21 percent of the body circumference and located
on opposite sides of the body at the rear end. The investigation was
made in the Langley 11-inch hypersonic tunnel at a Mach number of 6.86,
a Reynolds number aof 1.5 x 106 based on body length, angles of attack
from -50 to 250, and brake-deflection angles from 00 to 500, with the
brakes in the vertical and horizontal planes. The comparison of experi-
mental results with the results of Newtonian impact theory shows that the
trends of the longitudinal. characteristics with angle of attack may be
predicted with reasonable accuracy. The drag brakes in the vertical
position produce higher total drag and higher negative pitching moments
at angles of attack than do the identical brakes in the horizontal posi-
tion, even though the top drag brake becomes ineffective at high angles
of attack.
. I RODUGON
A hypersonic aircraft or missile flying at extremely high altitudes
will encounter aerodynamic heating. of increasing intensity as it descends
into the atmosphere. Tis heating may be alleviated by decelerating the
aircraft. One means of accomplishing this deceleration is by increasing
the total drag of the .csniguration through the use of drag brakes.
As part of an overall program to investigate an airplane configu-
ration at high supersonic speeds (refs. 1 to '7), an investigation was
made to determine the\effects on lift, drag, and pitching moment of'
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Penland, Jim A. & Fetterman, David E., Jr. The Effects at a Mach Number of 6.86 of Drag Brakes on the Lift, Drag, and Pitching Moment of an Ogive Cylinder, report, March 19, 1956; (https://digital.library.unt.edu/ark:/67531/metadc62441/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.