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The paraffin-based fuel has high fuel regression rate of 3 to 4 times in comparison with a conventional hybrid rocket fuel. However, the paraffin-based fuel has the problem in manufacturing because of their low tensile strength, bonding method inside the fuel cartridge and shrinkage. To increase tensile strength, we tried to mix the EVA with paraffinbased fuel. In addition, the change in the characteristic of the wax fuel when EVA is mixed is observed. The maximum strength rises up to about 1.6 times and the maximum strain increases up to 2.2 times when the content of EVA is 20% as a result of the experiment. However, the regression rate decreases about 35% when the EVA content is 20%.
Maruyama et al. (2011) studied this question.