A method for expression of interior ballistic consistency was presented to describe theconsistency of a small caliber electrothermal-chemical (ETC) launching tests. For a group ofN tests with the same ETC launching conditions, if x was a test parameter, each test valuecould be written as xi. We could calculate and obtain both the arithmetic mean value andstandard deviation estimate. Hence, the consistency factor κ of this test parameter can bedefined as the arithmetic mean value divided by the standard deviation estimate. And thesmaller the value shows the better consistency of the data. This consistency factor couldbe employed to describe the consistency of both different parameters and same parameter ina group tests. The firing tests of the small caliber ETC launching were conducted. And theconsistency of ETC launching tests was researched. Influences of parameters on the ballisticconsistency were discussed through the consistency factor.
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