The research for low toxicity and no damage to the environment has stimulated the development of specific investigation lines in many areas.Inevitably, the criteria for safe handling, sensitivity and, above all, specific impulse (efficiencies) of propellant compositions are still superior in relation to ecological appeals.Nowadays, however, the solid or liquid propulsion, as aerospace as military, has already compounds to efficiency and eco-friendly characteristics.This study aimed at describing "green" alternatives to propulsive systems.
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Silva et al. (2013) studied this question.
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