An experimental investigation was conducted at Mach numbers from 1.5 to 6.0 to determine the drag and stability characteristics of several flexible aerodynamic decelerators located in the wake of double-strut-mounted forebodies. Data are presented which show a decrease in drag with an increase in free-stream Mach number and/or a decrease in drag for both guide surface decelerators and for a ballute. Because of differences in calibration techniques, riser line length, and test equipment, a 50- to 70-percent lower value of drag coefficient was obtained on a series of supersonic X decelerators when compared to previous tests. The present data do, however, agree reasonably well with drag data for a full-scale decelerator. An indication of the parachute stability is given in tabular form. All of the present data were obtained at a free-stream dynamic pressure of 1.0 psia and static pressures corresponding to pressure altitudes ranging from 70,000 to 130,000 ft. (Author).