Effects of tunnel pressure ratio on test model base pressure measure-ments were determined for a finite- and infinite-length cylindrical body with both a blunt base and boattail afterbody throughout the Mach number range from 0.70 to 1.40 in the 1-Ft Transonic Tunnel, AEDC. The pressure ratios required to obtain correct base pressures independent of base station location are given for subsonic and supersonic tunnel operation under the conditions of this investigation. Variations in base pressure coefficient as a function of Mach number for blunt-base models of 0.50 percent and 3. 25 percent tunnel blockage ratio are compared with free-flight data.
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