The comparison showed that the results were generally similar for the same propellant combinations at the same operating conditions as long as the propellant viscosities were low enough to produce no significant effect on ignition delay. Because of this concurrence, results from the rapid-testing, open-cup apparatus can he considered sufficiently reliable in the determination of the suitability of a propellant combination with respect to ignition delay without further checking in the small-scale engine unless the propellant viscosity is a controlling factor. The small-scale engine apparatus, however, has utility in the study of the effects on ignition delay of initial ambient pressure, combustion chamber configuration, and other factors not amenable for investigation with the open-cup apparatus.
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