Quote:
Originally Posted by gmw
But things change when you go deep. The pressures get high very quickly. There must be some point at which the pressure of the water will slow down the bullet so much that pressure from exploding round (if it will fire at this depth) will stress the gun. Or is the pressure so evenly great that gun can still withstand the explosion and perhaps fire the bullet a few inches. My maths isn't bad, nor even my basic physics, but I'm not up to working out how great depths may effect the workings of an automatic rifle.
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From one of the video comments:
"Hydrostatic pressure doesn't quite work that way because it is pushing equally on all sides of the firing pin. A parallel example is that it does not take 4x the force to swim at 100ft as it does right under the surface even though pressure is 4x as great. What matters with drag is the density of the fluid, which fortunately for water does not significantly change with depth."
I'm confident he is correct.
When I dive, my neoprene wet suit compress and gets a bit stiffer, and the air cavities in my body get squeezed, but my muscles and joints continue to work just fine. The valves and switches on my equipment are no harder to operate at depth than at the surface.
ApK