My GB cannon is done! ( UPDATED!!!) now with damage pics

[unisonmind]

after being out of town for a lot longer then i wanted. its done and it has more power then any of my guns to date. this is gun #6 and my 2nd piston valve. i went up to the mountains today to test out the power. i ran it at 150 psi and i could barely see the GB's come out and they were out of view in no time.i had some 2'x4' strips of 3/4'' plywood and a few 2''x4''x12'' in the bed of my truck from a job i did and with the plywood it would blow 3'' holes in it like nothing and from about 20' it would break the 2''x4'' in half 4 out of 5 time and the 5th was hanging on by all most nothing but everyone tell me what you think about it


specs:
-2 1/2'x3'' chamber
-4' GB barrel sdr21 & sch80
-the piston is a pill bottle filled
with foam
-valve is 2'' tee with a 1 1/2'' port
-pilot is a 1/4'' ball valve

so i just got done with the paint job and i got all the small bugs out of the valve so i put the QEV back on it gives it a little more power


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all shots where at 65psi
front
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back
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inside back
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inside front
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[Mitchza89]

Beautifully made mate. Job well done.

[MrCrowley]

Very Nice! How'd did you get the plug to seal completely?
You should make a chamber/barrel support, it would take the stress of that elbow below the tee

[c19o]

Nice, im also interested how you got the plug to seal.

[e1337]

Very nice, I like the pilot.

peace
e1337

[Spuddin]

very nice! looks like u have all the hard to find most wanted stuff: 2 1/2" pipe, sdr21, sch 80! sweet!!! btw do u patch the golfballs?

[unisonmind]

MrCrowley- ya i do need to make a barrel support when i was in the mountains testing i used a sock and a bungee cord.- on the back plug i have a o-ring that is a real tight fit in the tee

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Spuddin-sorry but i have no clue what you mean by patch the golfballs and i dont have any 2 1/2'' pipe its 3'' and the barrel is 1 1/2'' sdr21 & 2'' sch80

[c19o]

Oooh, so you just stick the o-ring on there and bolt it in?

[unisonmind]

there is a grove for the o-ring and i use the treads as a back stop

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[Killjoy]

^^Great idea, i never though of doing that.

[jackssmirkingrevenge]

straightforward, clean, good job - that looks like it could produce some damage worth posting *hint hint*

[dongfang]

Hi,

Very nice cannon! A little smaller than the last one I made, but apparently more powerful! I like the simplicity and efficiency of your ball valve trigger.

Don't you have the same problem as me; the bolt holes in the tee chipping off th o-ring when putting in the plug?

Well done.

Regards
Soren

[jackssmirkingrevenge]

Don't you have the same problem as me; the bolt holes in the tee chipping off th o-ring when putting in the plug?

Presumably you could put a bevelled edge on the bolt holes to alleviate this problem?

[unisonmind]

i just take the bolts all the way out of the tee when i need to get to the piston

[dongfang]

Hi Jack,

It´s hard to bevel that thing from the inside, but I managed to grind them a little smoother with the Dremel. Still chips the rings though. But heck, they stay airtight even with some chips in them. Right now, I just let it happen when removing the plug, and carefully adjust in the bolts to make a smooth surface in there when putting it back in.

Regards
Soren