On September 2,1992,a free fall capsule was released form a balloon (B30-62) at an altitude of about 31km, and a hemisflo type parachute was successfully deployed during the supersonic flight of the capsule. The parachute was installed in the pressurized parachute case attached on the backside of the capsule, and it was deployed by a pre-set timer at the maximum Mach number of 1.3,52 seconds after the release. The supersonic parachute has been developed at ISAS, for applying to planetary atmospheric entry missions and recovery missions in the near future. The balloon experiment was conducted as a preliminary study for the succeeding parachute experiment using a reentry capsule from a sounding rocket (S-520-16), which was also successfully conducted on February 18,1993. During the supersonic and transonic flight of the capsule, deployment of the parachute was monitored by a CCD camera installed in the capsule, and vibrational motion of the canopy was evaluated. Three axis acceleration and pressures of the capsule were measured and transmitted to the ground base (SBC), and impulsive load at the parachute deployment was found to be relatively large. This was because all components of the parachute, i.e., canopy, supension lines and risers, were made of aramid (Kevler) ribbons, maximum elongation of which was less than 5%. Deployment scheme was to be further discussed and improved. Through the balloon experiment, fundamental aerodynamics of both capsule and parachute was understood, and deployment conditions for the next rocket experiment were carefully chosen.
気球投下カプセルによる超音速パラシュートの実験
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