my Big Cannon

[cenzo188]

my first and best pneumatic cannon, i call it the Big Cannon. it has a 1 inch bore. Launches C batteries really well, and just about anything else with a foam sabot. I am currently experimenting with dart-board darts with sabots. It is a big, heavy, clumsy behemoth so I usually shoot it mounted on a sawhorse but it shoots reallllllly fast and accurate. my newest mod is a lubricated barrel, lubed with a teflon fiber lubricant and it really makes a nice seal with any projectile.

the attached pictures are old pictures, now I have a psi guage and breech added; will take more as soon as I can find my dumb camera!


soon I will post pics of my 2 other cannons, another pneumatic and a classic combustion. Also some damage shots.

I'm new here.... just discovered this site and its cool =)

ps: in response to some comments, my clean out cap is in fact safe

[pyromaniac]

Sorry to tell you this but this cannon has a lot of dwv. The clean out cap and reducers are all dwv (drain waste vent). Maybe cut off the reducers and put some pressure rated ones in and a new cap. Other then that nice first cannon.

I wouldn't take this over 40 psi if dropped while pressurized it may explode.

[ShowNoMercy]

What year vette is that ? Btw nice cannon

[spudgunnerwryyyyy]

Cenzo. That end cap is very unsafe. A proper end cap cost about 3 dollars. A coupling to bushing for reducing costs about 7 dollars. Spend 10 dollars and make it safe. Right now it is not safe. Other than the massive non safeness good cannon.

[cenzo188]

whats unsafe about the cap?

[spudgunnerwryyyyy]

Its a clean out cap meant for low pressure drainage systems. It is meant to hold pressures of about 10-15 psi. Unless you used a female adapter with a threaded plug. But looking at the cap it doesn't look that way. Use your judgment I'm just informing you.

[cenzo188]

i did use a female adapter with a threaded plug

[spudgunnerwryyyyy]

Sweet, sorry for giving you so much crap man just making sure every ones safe. Happy spudding. You might want to edit that into your main post as people like me may say something. Sorry again.
SpudGunnerWryyyyy

[noname]

Since the plug, which can SCREW IN, happens to be THREADED, it's safe? Hell no! It's NSF-dwv, and it's very unsafe. So are both reducers. You're going to end up hurting or killing yourself or someone else with this cannon. Cut off the non-pressure rated parts and replace them with parts that say "NSF-pw" on them.

[benstern]

:sign10: <the_todd>I'll show you a big cannon right here!!!!</the_todd> :sign10: :spam2:

But seriously: trash that cannon way too unsafe; risk of catastrophic failure too great.

[hi]

dont trash the cannon, just the few parts. the way it is right now it is perfect for changing parts.

[DYI]

The female adapter, cleanout cap, and reducer are all non pressure rated, and the chamber is a complete waste of air. Just cut off the DWV PVC parts, and replace them with pressure rated ones, and you should be fine. If possible, attach a longer, and/or wider barrel. No point lugging around a big cannon when all that extra weight is just wasted space.

Noname: Threaded plugs are usually pressure rated, and cleanout caps are never pressure rated.

[noname]

A cleanout cap is a threaded plug, is it not? It may not be NSF-pw, but it is THREADED, and it PLUGS a female adapter. That's enough of a threaded plug for me. I'd only use one in a combustion, but being DWV doesn't make it any less threaded or pluggish.

[ammosmoke]

Pluggish lol... Really, a cap would have been cheaper/safer. And if that is a cleanout cap, well, its just not safe. Why spend 10 bucks when you only need to spend 3?

[DYI]

I'd only use one in a combustion, but being DWV doesn't make it any less threaded or pluggish.

"Pluggish"... Yeah, I know that a cleanout cap is a threaded plug, but the pressure rated ones are usually distinguished from the DWV ones by the different names.