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Internal Regulator for hammer valve pcp

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: jmez1996 » Wed Aug 29, 2012 3:09 am

jackssmirkingrevenge wrote:0.22" is not too easy, however you can "roll down" a 0.22 pellet to fit in a 5mm barrel, or tap it out like so to fit in a 6mm barrel: http://www.spudfiles.com/forums/adaptin ... t7178.html


oh clever. yeh ill look at 6mm then so it can be adapted to airsoft i guess.
so does larger calibre equal higher muzzle energy or is there a loss in velocity with the extra weight or surface area
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 29, 2012 3:23 am

Extra diameter means more surface area so the air has more area to push on. It also means extra volume for the air to expand in though, so pressure loss is more rapid.

A heavier projectile will normally give you more muzzle energy, because it makes more efficient use of the air and also makes up for valve opening speed. However this is at the expense of velocity, which is what you want for a flat trajectory. Shooting at 30 yards though, a reasonably dense projectile at 500-600 fps is more than enough for accurate shooting without having to worry too much about bullet drop.
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Unread postAuthor: Gippeto » Wed Aug 29, 2012 9:16 am

I'm taking it that commercially produced airgun barrels are not an option for you. crap happens.

With access to machine tools this doesn't have to be a huge obstacle...make a swaging die sized for whatever barrel you can source. Made one for a .32 pcp project as it was difficult at the time to source .310" ammo locally. Bit of work, but the rounds work well. :)
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Unread postAuthor: jmez1996 » Wed Aug 29, 2012 6:39 pm

Gippeto wrote:...make a swaging die sized for whatever barrel you can source. Made one for a .32 pcp project as it was difficult at the time to source .310" ammo locally. Bit of work, but the rounds work well. :)


Yeah i thought about this. Might even consider casting my own just for the exercise of it.
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