Investigation of the characteristics of 6-foot drogue-stabilization ribbon parachutes at high altitudes and low supersonic speeds
Performance data are presented for two types of ribbon parachutes. The parachutes were forcibly deployed from an air-launched test vehicle at altitudes from 55,000 feet to 70,000 feet and at Mach numbers between 0.92 and 1.52. Opening shock, steady-state drag performance, and canopy-porosity effects are evaluated with respect to Mach number and dynamic pressure. The conical canopy design appears to function far better than the flat canopy at supersonic deployment speeds. The relatively high-porosity conical design improves the parachute stability, with the added benefit of a low opening shock. The drag efficiency of the conical canopy is equivalent to that of the flat canopy having 50-percent-lower porosity. Riser elasticity and length also appear to be important parameters affecting the parachute stability. Reducing the weight of the test vehicle by a factor of one-third had a negligible effect on the stability and drag characteristics of the parachute.
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Aeronautics and Space air-launched test vehicle ALTITUDES AND LOW approximately Askania black powder calculated canopy breathing canopy-porosity effects canopy-riser force CHUTES AT HIGH Clinton Conical Conical Conical constructed porosity diameter drag-coefficient variation drogue parachute dynamic pressure effects are evaluated explosive bolts feet Figure 3(a Film supplement H-2 flat canopies Flat Flat Flat flow coefficients forcibly deployed HIGH ALTITUDES inflated drag coefficient inflated drag force launch aircraft launch rail load-supporting Mach number movie cameras number and dynamic numbers between 0.92 Nylon Nylon Nylon opening shock opening-shock drag coefficient oscillating packed canopy parachute test vehicle parachutes were forcibly percent Project Mercury capsule respect to Mach ribbon canopy ribbon parachutes sabot shaped conical canopy shroud lines snatch force SONIC SPEEDS Space Administration stagnation pressures steady-state drag performance subsonic sled tests supersonic supplement H-2 available TECHNICAL MEMORANDUM X-448 test parachutes trapeze types of ribbon U.S. Air Force variation with Mach WADC X-448 National Aeronautics