AIR FLOW CHARACTERISTICS OF PARACHUTE FABRICS AT SIMULATED HIGH ALTITUDES
MASSACHUSETTS INST OF TECH CAMBRIDGE
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The air flow characteristics of parachute canopy cloth were measured over an unusually wide range of test conditions. High altitude simulated tests up to 150,000 feet have shown the cloth to have markedly low flow rates, as may be predicted from a nozzle flow analogy. A method of predicting high altitude behavior was proposed. Permeabilities of four cloths were shown to be significantly dependent on their state of stress AT THE TIME OF AIR FLOW MEASUREMENT. The magnitude of this relationship was observed to be determined by the biaxial stress-strain behavior of each fabric. The air stream deflection tendency of thick canopy material was verified and its cause investigated. The role of pore geometry in influencing cloth permeability was explored.