Measurements were made to determine the effects of sting-support diameter on the base pressures of an elliptic cone with ratio of crosssection thickness to width of l/3 and a plan-form semiapex angle of 15°. The investigation was made for model angles of attack from -2° to +20°, at Mach numbers from 0.60 to 1.40, and for a constant Reynolds number of 1.4 million, based on the length of the model.nThe results indicated that the sting interference decreased the base axial-force coefficients by substantial amounts up to a maximum of about one-third the value of the coefficient for no sting interference. There was no practical diameter of the sting for which the effects of the sting on the base pressures would be negligible throughout the Mach number and angle-of-attack ranges of the investigation.
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