Investigation of the Characteristics of 6-foot Drogue-stabilization Ribbon Parachutes at High Altitudes and Low Supersonic SpeedsPerformance 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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28 Dacron 6-FOOT DROGUE-STABILIZATION RIBBON Aeronautics and Space air-launched test vehicle ALTITUDES AND LOW approximately Askania calculated canopy breathing canopy-porosity effects CHARACTERISTICS OF 6-FOOT Clinton Conical 8 28 Dacron diameter drag-coefficient variation drogue parachute dynamic pressure effects are evaluated explosive bolts feet Figure 3(c flat canopies flat-canopy forcibly deployed HIGH ALTITUDES inflated drag coefficient Inflated drag force instrument capsule launch aircraft launch rail load load-supporting Mach number mortar firing movie cameras NASA TM number and dynamic numbers between 0.92 Nylon opening shock opening-shock drag coefficient oscillating Oscillograph overinflation packed canopy parachute test vehicle parachutes were forcibly percent porosity Project Mercury capsule release respect to Mach ribbon canopies ribbon parachutes riser shaped conical canopy shroud lines Snatch force SONIC SPEEDS Space Administration stagnation pressures steady-state drag performance supersonic supersonic speeds TECHNICAL MEMORANDUM X-448 tension link test parachutes Test-vehicle weight types of ribbon U.S. Air Force variation with Mach WADC