High-altitude flight test of a reefed 12.2-meter-diameter disk-gap-band parachute with deployment at a mach number of 2.58
John S. Preisser, R. Bruce Grow, United States. National Aeronautics and Space Administration, Langley Research Center
National Aeronautics and Space Administration, 1971 - Sports & Recreation - 64 pages
A reefed B.2-meter nominal-diameter (40-ft) disk-gap-band parachute was flight tested as part of the NASA Supersonic High Altitude Parachute Experiment (SHAPE) program. A three-stage rocket was used to drive an instrumented test payload to an altitude of 43.6 km (143 000 ft) and a Mach number of 2.58 where the parachute was deployed by means of a mortar. After a time delay of about 8.5 seconds, the parachute was disreefed at a Mach number of 0.99. The report contains an analysis of parachute inflation, drag, and stability for both the reefed and unreefed parts of the test. In addition, detailed descriptions of the test parachute, the reefing system, and the parachute packing procedurea are included.
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12.2-meter nominal-diameter 40-ft acceleration aerodynamic heating aft camera film aft end altitude of 43.6 attachment system axial-force coefficient axis system band damage deceleration descent Disreefing occurred dynamic pressure earth-fixed effective drag coefficient Euler angle Figure 17 Fill direction flight test full inflation g-unit accelerometer gyro platform inflated shape Langley Research Center line stretch load Mach number Maximum elongation mortar firing mortar tube N/cm NASA Nomex number of 0.99 number of 2.58 oscillation oz/yd packed parachute parachute canopy Parachute Deployed parachute deployment parachute system payload payload-parachute system percent Tensile strength photograph pitch and yaw porosity Preisser presented in figure radial tape reefed inflation reefing line reefing rings reefing system reefing-line cutters Rip-stop rocket sec Figure shown in figure steady reefed steady unreefed inflation suspension lines tensiometer test parachute true airspeed type 52 U.S. Air Force U.S. Standard Atmosphere Unit weight unreefed parachute unsteady velocity