Firearms and Ammuni Forum banner
1 - 2 of 2 Posts

· Registered
Joined
·
40 Posts
You cannot practically bullet proof against rifle rounds. I've seen .223 blow holes through 1/4 inch steel. It's not going to be terribly dangerous after expending all that energy and being deformed, maybe even destroyed, but it points out that you can't do it on a large scale. You can't use kevlar wallpaper.

The ceramic plates and vests used professionally work about as well as they can against rifle rounds.

On a structure, all you can do is build the thing solidly and the energy will be absorbed. Cast concrete will do it, but almost anything can blast through a cinder block and cause injury or death. A foot or two of compressed dirt. Two inches or so of shredded tires. The Earth ship that the hippies make? Dirt pounded into old tires that are stacked to make a hovel? Sure, 2 feet of dirt will stop a bullet, and the last layer of tire will help even more.
 

· Registered
Joined
·
40 Posts
Just FYI, one of the original bullet proof vest designs included mail and fabric as you suggest, some were canvas filled with sand or lead shot, some were plates, there were a lot of approaches, but they all depended on the same thing. Trapping the bullet by mechanical means, the heavy canvas, and a solid or near solid substance that would absorb energy by being moved by the impact.

Like a BB gun and a can of water. it may penetrate the first layer, say the canvas, but then it has to push aside the water, and then the final layer is another chunk of steel that will maybe bounce it back through elastic collision. In this process, the all through the penetration, there will be energy absorbed just because the BB has struck that first layer of steel and shaken the entire can full of water, and will be stirring it up all the way through.

IIRC, the nra range has a snail type backstop, one inch steel, with a continuous oil flow down the side. It can handle everything all the way to the big express rifles. It uses the energy on the secondary function. The impact on the angle transfers minimal energy, the rest of that energy is drained as it spins inside the snail chamber, both through friction and by having the constant pressure against the steel plate that the spin chamber is made of.

When I was young, I built my own BB trap out of an inner tube. It was simple. the bullet couldn't penetrate; it struck the rubber and the entire load of energy was absorbed by popping that sheet of rubber.
 
1 - 2 of 2 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top