
Opinion on the utility of super-cavitating underwater ammunition?
Image credit: Nammo
Relatively few options have been available especially defensively for underwater attacks on surface ships. Even if you say saw/heard a torpedo coming, you had best hoped you could outrun it as you had limited options to hitting it. With underwater and especially semi-submersible drones this could be a bigger issue than ever before
But maybe super-cavitating ammunition is a solution?
The USN already has one in service in the 30x173mm Mk 258 Mod 1 as seen in the graphic above, primarily in to my knowledge use for minesweeping, there’s theoretical usage even discussed by Nammo themselves which could include close range torpedo and submarine defense.
One of the big issues with this type of method would be that you would of course need to hit an underwater contact, which usually one doesn’t have a perfect position for. The other is that even the best performing projectiles can’t go that far underwater which would mean a pretty short ranged defense.
The bigger the projectile the longer ranged so if one had say a 5” (127mm) version it would have a massively higher effective underwater range and a meaningful explosive charge though you’d be giving up as good in-air performance.
But what do y’all think?
Could this be useful in a defensive role for surface ships? Or is it only good for mine clearing realistically?