The combustion (ballistic) properties of a high solid loading composite solid propellant family (Butalites) was studied experimentally by using propellant formulations based on hydroxy-terminated polybutadiene pre-polymer (HTPB) as a fuel binder main backbone,bi-modal system ammonium perchlorate oxidizer (AP) and aluminum powder (Al) as metallic fuel. Burning rates were doubled at various pressures,when solids loading (AP and 17% Al) were increased from 80 to 88% and the measured characteristic velocity values were increased by about 100 m/sec. The pressure exponent (n) values were lower with 80-85% solids loading. The burning rates were increased by about 2-5% when comparing the data obtained by static firing with those obtained by the strand burner method.
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