shoulder fired co-axial cannon+video

[pneumaticcannons]

I approve of this cannon. it would look SICK painted flat green.
Normally i'm not a fan of electrically actuated sprinkler valve... but i LOVE the trigger that you have.

Just to point out... It looks like ALL the fitting are DWV. (except the front bushing.)

I would advise on your next build, yo make sure you get pressure rated fittings... they have a much deeper socket. the couplers are about 2x as long.

I personally, WOULD shoot this at 50psi.... but if you ever hear even a tiny leak from any of the fittings... set it down very carefully and GET the #%@& away from it.

when you build your next one, use pressure rated fitting, and crank her up to 150 psi. (also, use a 1.5'' chamber with a 1/2 barrel... 2'' is nice, but overkill. you would notice very little performance decrease.)

ya i recently did some math and realized that the B:C ratio is like 8 to 1 lol. Ill be replacing her barrel next summer and It still has some good power even at 50 psi. And are u sure ALL the fittings are DWV?

[Crna Legija]

And are u sure ALL the fittings are DWV?

they sure do look like it, the front reducing bushing might be rated.

[pneumaticcannons]

they sure do look like it, the front reducing bushing might be rated.

So now the only part that I thought was not rated is now possibly rated and the rest not??? lol ill just keep firing this thing at 50-60 psi for the sake of safety

[pneumaticcannons]

Update: Summer of 2012

I once again upgraded my big plunker this summer while in the US of A's, swapping out the 1/2" barrel for a more practical 1" one. I also redid the piston and bumber for an overall performance increase(somewhat) The piston unfortunately reseals when firing lighter projectiles, hence the somewhat. No pictures because while on my arse, I forgot that I was not only into building, but also documenting the construction of launchers.
[youtube][/youtube]

[mattyzip77]

Very cool cannon and video. I would tell you to mod the valve but I am sure you already know that trick and like it the way it is. Good work dude..