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NASA Technical Note
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Performance Characteristics of a Preformed Elliptical Parachute at Altitudes Between 200,000 and 100,000 Feet Obtained by In-flight Photography
The performance characteristics of a preformed elliptical parachute at altitudes between 200,000 and 100,000 feet have been obtained by means of in-flight photography. It was demonstrated that this type of parachute will open at altitudes of about 200,000 feet if conditions such as twisting of the suspension lines or draping of the suspension lines over the canopy do not occur. Drag-coefficient values between 0.6 and 0.8 were found to be reasonable for this type of parachute system in the altitude range between 200,000 and 100,000 feet.
Inflation and Performance of Three Parachute Configurations from Supersonic Flight Tests in a Low-density Environment
Ten flight tests of modified-ringsail, disk-gap-band, and cross parachute configurations with deployment at Mach numbers and dynamic pressures corresponding to conditions expected during entry into a Martian atmosphere have been completed. Comparison of flight results indicates that theoretical snatch force values were never exceeded when the deployment techniques of these tests were used. Opening loads showed no definite trend with Mach number. Values for filling times compared favorably with generally accepted empirical curves based on 15-percent geometric porosity. Canopy stability was good when Mach numbers were below 1.4 for the modified-ringsail and disk-gap-band configurations.
