FLIGEY MEAS UREMDVW OF BASE PRESSURE ON BODIES OF REVOLUTION WITH AND WITHOUT

Base pressures were measured in flight on fin-stabilized bodies of revolution with and without rocket chambers and with and without a converging afterbody. The Mach number range covered was between 0.7 and 1.2. Results show that presmres over the center portion of the bases of mcdels with rocket chambers were higher (less suction) than edge pressures, whereas the center base pressures on models witho’~t b rocket chsnibers were lower than edge pressures. The effects of rocket charibers on edge pressures were not, in general, as appreciable as the effects on the pressures measured over the center portion of. the bases. The results further show that changing from a cylindrical to a convergent afterbody decreased base drag markedly and in this particular case caused the base drag to become negative at Mach numbers below l.0~