The other day when playing with GGDT a little bit I came across that, and I figured that is what it was asking for.

Sorry for not understanding what that is, I am still new to all the piston gun terms.
By valve seat do you mean the size of the pipe that the piston sealing face seals? If so I am using a 3 inch pipe. The OD is almost 3 1/2", just barely under, and the ID is 2 7/8"

Impressive! How deep did the steel bar get into the tree?

The steel bar doesnt go that far into the tree, maybe 4 inches? But we shot that at only 60 PSI or so.

I have since fixed the leaky piston sealing face, so we can now go up to higher pressures without worrying about the projectile ...

I'm thinking about constructing one similar to this, I already have most of the parts. Hopefully mine can come close to as good as yours,

The valve looks clean. It always bugs me when people add the extra coupler and pipe.

How long does it take to fill this beast?

Thanks. The main thing I ...

now with adjustable front wheels!

i used a plunger for my 4inch piston

damn you :evil:
did you get that plunger idea from mine or did we just both think independently and figure out the same thing
p.s. i said damn you because you got damage pics and vids before me
I knew I needed thicker rubber, and I didnt know where I was going to get some so I thought a plunger ...

smexysmileyPiston wrote:that is 1 of the smexyest Cannons iv seen on spuddy...wat psi i use???
just a beautiful gun

We didn't ever take the gun above 80 PSI, didn't see a need to do. I would feel comfortable going to 120 PSI though.

i guess it really all depends what you are shooting out of it. if you dont need a 1 inch barrel then stick with the 3/4 and get a 3/4 sprinkler valve.

loose the ball valve and get a modded sprinkler valve
and why not bump up to 1inch and instead of 3/4?

cannon is in the showcase!
http://www.spudfiles.com/forums/viewtop ... tml#252744

Gun Type: Barrel Sealer
Piston: Housed in a 4 inch tee.
Chamber: 4 ft x 4 in
Barrel: 7 ft x 3 in and 5 ft x 2.5 in
Exhaust: 1 inch modified sprinkler valve
Primary Ammo: Frozen Popcans and anything else that fits down the barrel

Shooting Video
[youtube]http://www.youtube.com/watch?v=zkkhaFWL5Mc ...

omg! so much more power than i thought. i need to throw a vid together and then i will post it.

here are some teaser pics in the mean time
http://img198.imageshack.us/img198/8868/cimg35018287203.jpg
http://img24.imageshack.us/img24/6890/cimg35118302400.jpg
http://img194.imageshack.us/img194 ...

painted the cannon today finally bringing the cannon to my friends farm tonight. will be taking vids and pictures so i can add the gun to the showcase!

i tried the piston with the rubber bumper off and it wouldnt fire. instead of messing with it more i just put it back on. i know i am sacrificing performance with the added weight, but i am okay with that right now. i will save it for a different day to attach the bumper to the back plug.