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This paper outlines methods for calculating the ballistic behavior of hybrid propellant combinations. The effects of scaling, pressure level, and internal geometric configuration are examined, utilizing a machine analysis that is based upon heat-transfer-limited theory. It is shown that the crucial aspect of efficient hybrid grain design is the proper matching of the surface area progressivity to the regression rate-mass flux dependence. Consideration is given to the interaction between the convective and radiative modes of heat transfer and to general aspects of throttling. Regimes of operation where the heat-transfer-limited theory begins to break down are delineated.

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