Abstract
In parachute model experiments, performed for the study of static and dynamic parachute characteristics, one must consider, besides Reynolds and Mach number influences, the effects of canopy porosity, weight, and flexibility. Porosity can be expressed as a function of Reynolds and Mach numbers. For the definition of the structural characteristics, a stiffnessweight index is proposed. Fabrication details for building models with a low stiffness index were developed. Wind-tunnel and catapult tests with models of different stiffness indexes showed significant differences in parachute drag, inflation, and squidding characteristics.
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