Ballistic characterization of an extended group of innovative HTPB-based solid fuel formulations for hybrid rocket propulsion\r\nwas performed in a lab-scale burner. An optical time-resolved technique was used to assess the quasisteady regression history\r\nof single perforation, cylindrical samples. The effects of metalized additives and radiant heat transfer on the regression rate of\r\nsuch formulations were assessed. Under the investigated operating conditions and based on phenomenological models from the\r\nliterature, analyses of the collected experimental data show an appreciable influence of the radiant heat flux from burnt gases\r\nand soot for both unloaded and loaded fuel formulations. Pure HTPB regression rate data are satisfactorily reproduced, while the\r\nimpressive initial regression rates of metalized formulations require further assessment.
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