Generalization of the muzzle wave similarity rules

The present paper describes an improvement of the muzzle nra ire similarity that permits treatment to unsteady and non sonic gun muzzle conditions. Th e revised formulation of the similarity is capable of characterizing the mu zzle wave propagation even for significant variation of the muzzle conditio ns during the life time of the wave. Suitable scaling parameters are select ed and tested yielding appropriate similarity rules at a significantly redu ced number of tests whose applicability is confirmed by experimental data a nd comparison to an analytical theory.