Abstract
The brief research reviews the history of an innovative method in propellant technology. In 1942, the renowned US scientist Joseph Hirschfelder led a team that devised a simple calculative method for helping to design wartime solid propellants, whose gas, when burnt, served to drive projectiles in gun barrels. The method estimated the temperature of the gas for each propellant and other factors. Until then, these were estimated through a rigorous theoretical process. The simplified theoretical approach of the new method gave nearly the same temperatures and other important values, all with basic arithmetic. It was later refined by others, for better accuracy, and applied for designing solid rocket propellants, through a short theoretical adaptation.
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