posted on Jul, 14 2005 @ 08:08 AM
Originally posted by skippytjc
Maybe new armors should have a water layer
Not water but a viscous crystalline material that behaves like liquid glass.
Called 'Sheer Thickening Fluid' it has roughly the consistency of honey when stirred gently, but it's very fluid behavior transfers impact shock
more efficiently so that the PEG chains form giant molecular monocrystals of surprising strength when suddenly subject to accelerative inertia.
In terms of water, I am a bit surprised, as I know of multiple instances of HMG rounds being used for below waterline kills on both assault landing
craft and in one case (Wake) to sink a IJN destroyer performing offshore gunfire support to landing Japanese troops.
At the same time, water is _utterly incompressible_ under nearly any natural force you care to apply to it.
So that if you formed a large enough impact shock in front of the round (so that the H20 could not displace rapidly enough) the effective phase change
to a pseudo-solid would be instantaneous. At which point (depending on round shape and grazing angle at impact) the bullet would most like and
likely tumble and then break up as the density variations between the outer brass or steel jacket and the inner lead or tungsten/ceramic cores would
cause incredible mass differentialed decelerative behaviors that would like result in frangilate behavior on the projectile as a whole.
That said, it should also be noted that there ARE guns which work, quite effectively, underwater. Any of the 9mm Glocks with a fluted firing pin and
seal discs works well enough, (with FMJ rounds), though range is low.
And the Russians came up with a 'needle gun' that uses a flat head to generate a supercavitating bubble around the front end of the long, skinny,
So it's basically all about sectional density and the ability to sustain smooth displacement around the projectile that keeps the fluid laws working