Abstract
Minimum weight and volume requirements for spacecraft recovery systems dictate the need for accurate load-prediction methods for the parachutes employed. The use of clustered parachutes presents a particular problem, because of the wide variation in individual parachute peak loads which can occur during the opening sequence. Nonuniform opening of Ringsail parachutes in cluster has been observed and analyzed. Major factors affecting nonuniform opening and the associated variations between individual parachute peak loads have been identified. A method is presented for predicting peak disreef loads for individual parachutes in cluster using opening-shock-factor data, together with other measured operational characteristics of the parachute and its associated hardware. *
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