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my First gun

Built a combustion 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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my First gun

Unread postAuthor: toasterplug » Sat Jun 02, 2007 2:55 pm

This is my first gun. It's has a 3"x24" chamber and a 1.5"x48" barrell. It has a chamber fan for mixing/venting and it is abreach loader. I like the paint the best. It works pretty well but I haven't had a chance to distance test it yet. I'm shooting butane but most likely go to a metered propane set up soon.
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Unread postAuthor: lukemc » Sat Jun 02, 2007 3:01 pm

much better than my first bravo i give it 11 thumbs up and 2.5 thumbs down for the sideways ignition handle. i bet its akward to shoot
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"Those who are different change the world. Those who are the same keep it that way"
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Unread postAuthor: Pete Zaria » Sat Jun 02, 2007 3:05 pm

Welcome to spudfiles.

Great job for a first cannon. Much nicer than my first. I like the paint job, also.

Did you use ABS or PVC? For combustion guns I prefer ABS (better failure characteristics), but either will do.

Do you not need barrel supports? If your barrel can flex much, it might not be a bad idea to give it some supports...

Look around this site at the several different common types of propane metering. The simple two-ball-valves-and-a-pressure-gauge method works fine and can be constructed for around $35. You can add a regulator, 3 way valve, etc... if you want to get more sophisticated than that, but it's kind of overkill in my opinion.

Again, great job for a first gun. Hope you stick around.

Peace,
Pete Zaria.
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Unread postAuthor: toasterplug » Sat Jun 02, 2007 4:05 pm

lukemc- Actually it shoots really easy if you define the top of the gun by the orientation of the handle and not the barrel. The barrel is off to the side not on top. You hold it at the hip. Thanks for the 11 thumbs.

Pete- thanks for the comments. I used PVC and as far as supports go my barrel is rather short (4 foot) and flexes little. I'll probably go for the simple meter when I get around to it.
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Unread postAuthor: hi » Sat Jun 02, 2007 6:05 pm

very nice.

what kind of paint did you use?
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: flamerz14 » Sat Jun 02, 2007 9:25 pm

Sweet! nice paintjob, remins me of desert cao.
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Unread postAuthor: toasterplug » Sun Jun 03, 2007 9:13 am

I used Krylon Ultra-Flat Camo. It's the stuff that is supposed to bond with plastics really well. Fuizon?(sp) I used A sandy tan color and black. I painted the whole thing black and then laid out some blue painting tape and cut stencils. Some over lapped so that I could make multiple shades of tan/black by peeling a layer off and lightly spraying on the exposed layer and then peeling off the next layer for a truer black.
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Unread postAuthor: spudthug » Sun Jun 03, 2007 9:26 am

cool gun! especcially for a first..my first one sucked...this is great!

btw what size is your ball valve? is it painted or is it abs?

how did u attach it?

how did u get the butane into the gun?
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: veginator » Sun Jun 03, 2007 10:15 am

awsome gun :D i like the paint job.
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Unread postAuthor: toasterplug » Sun Jun 03, 2007 11:10 am

The ball valve is 1.5" PVC and it is painted flat black except for the handle which I left red as it came. I thought I would be more aware if the valve was open or not if I left it bright red. I used a bushing that reduced from 3" to 1.5" and welded it like any other joint.

I have a butane can which I affixed a wd-40 nozzle to with the red spray tube. I open the ball valve. Let fresh air vent in with fan on. Fan off (just to be safe as my fan is very close to the ball valve opening) I spray the butane into the chamber. The red tube thingy lets me be sure of getting the butane deeper into the chamber so I waste less. It takes very little gas to get a good launch.
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Unread postAuthor: meatballs » Thu Sep 13, 2007 9:48 pm

you mean you turn it off because the butane is going in right next to it, or is there some sort of potential for a physical obstruction? if its just the concentration of butane, dont worry about it. burshless motors dont spark, and the mixture isn't ideal for ignition until the fuel is fully mixed. you do use the fan to mix the fuel, right? and if its a potential physical obstruction then use your own judgement, you know your gun better than me, which btw it is a pretty sweet gun especially for a first, excelent paint job, looks good.
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Unread postAuthor: brother361 » Mon Mar 03, 2008 7:23 pm

that looks really awkward to hold
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Unread postAuthor: Grizzlybear » Wed Apr 02, 2008 11:27 am

Nice ! I like the paintjob too! :o
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