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12 bore HPA coaxial

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 10, 2010 2:42 pm

Alright, I guess the hpa makes up for it, but in that diagram you posted with the grip, is that a chamber extension under it?


Nope, it's a suppressor in a cunning disguise ;)

POLAND_SPUD wrote:ohh BTW.... the weather is scorchio, don't you think ?? damn it's 30 deg C here... I am guessing it must be more than that in your 'bat cave'


Scorchio!

Lolol Chanel 9 Neus sounds very much like my Spanish 4 years ago :D

Yep it is bloody hot here, the humidity doesn't help either... if it wasn't so bad I would have removed the compressor from my A/C a long time ago :D

you know the one with the mag tube inline with the barrel and vents cut in it close to the detent... that should have enough mag capacity for 5 - 10 rounds...
I know you know what I am talking about


This one?

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Unread postAuthor: POLAND_SPUD » Sat Jul 10, 2010 2:51 pm

yeap.... exactly that one

Chanel 9 Neus
heh JSR mental
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 10, 2010 3:40 pm

The Enrichment Center once again reminds you that android hell is a real place where you will be sent at the first sign of defiance
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Unread postAuthor: POLAND_SPUD » Sat Jul 10, 2010 4:30 pm

well in if you're involved in some clandestine assassination then go for it... otherwise, what's the point ??
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Unread postAuthor: Gun Freak » Sat Jul 10, 2010 4:31 pm

That launcher isn't valveless, there's a schrader :tongue3:
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 10, 2010 5:09 pm

POLAND_SPUD wrote:well in if you're involved in some clandestine assassination then go for it... otherwise, what's the point ??


Hehe not planning on being involved in anything of the sort, but then again, what was the point of the pen guns?

That launcher isn't valveless, there's a schrader


There's already enough pedants on this forum :P :)
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Unread postAuthor: al-xg » Sat Jul 10, 2010 5:52 pm

I still prefer the dart idea for captive piston designs, it also means you push the piston back with the dart on reloading.

But the dart should have flights, so in order to centre the dart without damaging it, the toilet brush method JoergS used on is arrow slingshot could a good solution.
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 10, 2010 6:08 pm

Something like what brian had done?

No need for flights if you use a hollow tail...
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Unread postAuthor: al-xg » Sat Jul 10, 2010 6:17 pm

The same hollow tail they use on bows and crossbows ? ;) (which is in fact true :roll: but the flights are still obliviously quite useful)

I don't really have any use (well I guess that applies to most people really) for such a launcher but I've been tempted for a while now to build a captive piston barrel for hunting arrows. (they just tend to be more rigid as they are designed for more powerful bows)

Not too sure what I'd do with it though, I guess I could try and make a shot straight through a hay bail. Hard targets often brake arrows or just make recovery very difficult. :roll:
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 10, 2010 6:45 pm

al-xg wrote:The same hollow tail they use on bows and crossbows ? ;) (which is in fact true :roll: but the flights are still obliviously quite useful)


Seems to work well enough for Brenneke type slugs :P ;)

I don't really have any use (well I guess that applies to most people really) for such a launcher but I've been tempted for a while now to build a captive piston barrel for hunting arrows. (they just tend to be more rigid as they are designed for more powerful bows)


Indeed, if we only made launchers that have a specific use this forum would be quite empty. In this case, the point of having a captive sabot is not for the sake of stealth and noise suppression (though it is a side benefit) but rather it preserves the sabot for re-use, as it involves enough work to manufacture for it to be tedious to use it only for one shot.
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Unread postAuthor: Slauma » Sat Jul 10, 2010 11:49 pm

How well do the CO2 cartridges fly? tumble? I've seen others use them before, I think I might follow suit with my next build. They're uniform, destructive, disposable, and cheap (or free if you look hard enough). Seems almost too good to be true so me thinks there must be a catch; maybe a little lacking in the aerodynamic region? Maybe some little fins could be made and attached to them though. They'd look like wee little bombs 8)
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 11, 2010 12:33 am

They fly "straight" in the video because the target is only a couple of feet away from the muzzle, rather than using fins I think this is a better idea.

Image

In the case of the barrel I'm currently using there's no need for a sleeve because it fits almost exactly. It's just a question of sawing the capsule in half and pouring something heavy into the nose. A good way for doing this if you don't have a container to melt lead in is to cut up some solder and heat the entire capsule, outdoors of course.

Here's one I made earlier, note the blunt nose from repeated impacts ;)

edit: Here's an round made with the opposite side for "armour piercing" effect, due to very poor sectional density it didn't go all the way through but made a nice enough hole in the 1mm steel sheet. A saboted dart would have gone through several sheets like butter, and I still have yet to turn it up to 800 psi...

[youtube]http://www.youtube.com/watch?v=zNOFxyy1Q3k[/youtube]

No problems with a pellet tin lid and the 1/4" fibreboard behind it though:

[youtube]http://www.youtube.com/watch?v=IThigjkBeVA[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 11, 2010 7:52 am

WIP shot, the suppressor is curing as we speak...
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Unread postAuthor: jakethebeast » Sun Jul 11, 2010 8:10 am

looks promising, how much power do you lose with that suppresor?
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 11, 2010 8:25 am

Haven't quantified it yet, basically there's three 8mm holes spaced 2 inches apart starting 2.75 inches from the muzzle, feeding into a dual chamber suppressor with a volume several times that of the barrel.

I'll test it tomorrow when it's all cured.
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