jackssmirkingrevenge wrote:Hydraulic fittings are commonly rated to 8,000-10,000 psi, that would be the "sane" limit to me
I'd advise against it. Air starts doing
very weird things at those pressures, both in terms of how it interacts with other materials and how it behaves on its own.
A litre of air in that pressure range stores the same kind of energy as a hand grenade (which isn't entirely surprising, as this much air masses more than half a kilo), compressibility deviates significantly from the ideal gas law (it's so dense at this point that it starts acting more like a liquid), you get several of the other problems that can occur in hydraulic plumbing (like hammer effects, where the momentum of the fluid starts presenting an issue), rapid de-pressurisation will cause the air to condense or even sublimate (which could potentially jam valves), you'll have explosive decompression in many materials, potentially cases of embrittlement in others, the reactivity will get all kinds of screwy with that kind of partial pressure of oxygen, etc, etc.
Trying to use air (or, perhaps preferably, pure nitrogen) at that kind of pressure would mean having to do a major research project before you even started designing, and you'd be breaking into areas that aren't all that well documented in this particular context.
I actually noticed the partial counterbalance aspect. That design looks like it would be perfectly customizable for pretty much any balance level you wanted. (Ten years? Wow. Just under two years for me... )
. Of course I'n not planning on use 3000 psi as a PCP rifle, only 1000 psi. I have a 22mm OD 2mm walled 314 seamless SS tube lying around, would it be enough?
