Momentum theory of explosive reactive armours

The deviations of the jet of a shaped charge or of the rod of a KE-round by the flying plates of an Explosive Reactive Armour (ERA) are described by a simple momentum equation. This continuous consideration does not describe the non permanent event at all, as the plates pulsate or act iteratively es pecially against shaped charge jets. Nevertheless, they give a good trend a nalysis concerning angles of the ERA-sandwich changing with respect to the direction of attack, jet or KE-round velocities and densities of plates or attackers.