Sting Interference Effects on a 7 Deg Cone as Determined by Measurements of Dynamic Stability Derivatives and Base Pressure for Mach Numbers 0.2 through 1.3

The effects of sting support interference were investigated on the measurements of pitch damping, yaw damping, pitching moment slope, pitching moment and base pressure. The model was a 15 percent spherically blunt 7 deg cone. The forced oscillation technique was used to obtained data at Mach numbers 0.2 to 1.3 and Reynolds numbers, based on model based diameter, of 0.2 million to 3.6 million. The amplitude of oscillation was + or - 1 deg, and the reduced frequency parameters ranged from 0.006 to 0.049. The test was conducted at two oscillation frequencies, nominally 3.1 and 5.6 Hz. Pitch damping data were obtained at angles of attack of 0 to 28 deg, and yaw damping data were obtained at angles of attack of 0 to 20 deg. The effective sting length was varied from 1 to 3.4 model diameters. The interference effects of two types of model wake splitter plates were also investigated. The data obtained from this test at the transonic test conditions agreed with the results extrapolated from previous tests at AEDC at supersonic-hypersonic test conditions. (Author) Prepared in cooperation with ARO, Inc., Tullahoma, TN. See also Rept. nos. AEDC-TR-77-66, AD-A042 747 and AEDC-TR-79-89, AD-A091 115.