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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0pening approximately Askania ASTIA Doc black powder calculated canopy and riser canopy breathing canopy deployment canopy design canopy-riser force Coleman mechanical tensiometer Conical Conical Conical constructed porosity Dacron Dacron Dacron decrease device diameter drag-coefficient variation drogue parachute dynamic pressure explosive bolts Figure 3(a flat canopies Flat Flat Flat flat-canopy data flow coefficients gores inflated drag coefficient inflated drag force instrument capsule instrumented test vehicle launch aircraft launch rail mortar installation movie cameras number and altitude number and dynamic Nylon Nylon Nylon opening-shock drag coefficient oscillating overinflation occurred packed canopy parachute stability parachute test vehicle percent Project Mercury capsule Reentry profile release ribbon canopy ribbon parachutes riser material sabot shaped canopy shaped conical canopy shown in figure shroud lines snatch force stagnation pressures subsonic sled tests supersonic speeds tension link test canopy test parachutes test vehicle showing trapeze U.S. Air Force variation with Mach velocity WADC