THE DRAG AND STABILITY PROPERTIES OF THE HEMISPHERICAL BASE SHELL, 75MM, T50E2

The drag and stability properties for Mach numbers from 0.7 to 1.70, of the 75nim HE shell T50E2, a hemispherical-base design, are presented and discussed. It is shown that this shell is dynamically unstable at low yaw levels for Mach numbers from 0.7 to about 1.3. It appears, however, that the behavior of this shell improves at high yaw levels at supersonic speeds. The behavior at Mach numbers between 0.7 and 0.9 is confused by apparently unstable airflows over the hemispherical base. Therefore, the aerodynamics in this speed range as inferred from an analysis of the shell's yawing motion, varies from round to round even at the same speed.