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Gort's 12" Diameter Cannon (5 Gallon Buckets!)

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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Gort's 12" Diameter Cannon (5 Gallon Buckets!)

Unread postAuthor: sgort87 » Mon Jul 17, 2006 12:30 am

So I've been eying this abandoned pipe on the side of this road for quite some time. Hoping it was 10" for basketballs, I decided to go yank it and to my surprise, it was in fact, 12 inches in diameter.

<a href="http://putfile.com/pic.php?pic=main/7/19623060045.jpg&s=f10"><img src="http://www.spudfiles.com/uploader/uploadFiles/big6.JPG"></a>
That's me and the beast.(Click it for a bigger picture.)
<a href="http://putfile.com/pic.php?pic=main/7/19623052329.jpg&s=f10">Yeah, and here's Boomer.</a>

So I started cutting a wooden plug when ShadowWalker was here earlier. (Very inpressive launcher he has, by the way.) I didn't finish it until later when Boomer and I came back from a Chili Cheese Dog and Slushee run.

Having the one end belled made tracing the plug board easy since all I had to do was use a marker around the non-belled end. The dremelling was the shitty part. It was just incredibly hard to handle for some reason.

For the <a href="http://putfile.com/pic.php?pic=main/7/19700251531.jpg&s=f10">Plug</a> I cut two plates from 3/4" solid wood and stacked them inside the coupler end with Liquid Nail as a sealer on the inside of the disks against the chamber. Then I used six wood screws, not into, but next to the plug. This way they keep the plug from sliding back without weakening the wood by being inside the board and cracking it apart like the original Kraken by SMOMW. [:p]

I have it set with somewhere between .7 and .8:1 C:B. I forget which. It uses my universal ignition box and takes 11 shots of 110 psi from my universal meter pipe. I will be giving it its own meter soon though because doing 22 ball valve turns gets annoying fast.

To vent this - for today since I ran out of male quick-disconnects with 1/4" male threads - I stuck a male quick disconnect with female threads in an air hose from the compressor and dropped it down into the chamber. It vents it out in the ammount of time it takes to retrieve the bucket and refill it.

I really find my <a href="http://putfile.com/pic.php?pic=main/7/19700510523.jpg&s=f10">mixing system</a> to be a joke, though it works fine. It is a 4" fan duct taped to a ring of sch40 4" pipe with the battery taped along with it. Simply drop it in and you're all set.

So I discovered that if you cut the top part off a 5 gallon bucket, it fits nicely in the chamber and works well as a sabot for almost anything like water, dirt, stuffed animals, garbage, siblings, midgets, you name it, it shoots it.

Here are some videos of it in action:

<a href="http://media.putfile.com/12inch1">Some Water</a>
<a href="http://media.putfile.com/12inch2">Some more water launched by Boomer.</a>
<a href="http://media.putfile.com/12inch3">Goodbye to an old friend.</a>
<a href="http://putfile.com/pic.php?pic=main/7/19623062797.jpg&s=f10">And here's the aftermath photo.</a>
<a href="http://media.putfile.com/12inch4">Random Garbage</a>
<a href="http://media.putfile.com/12inch5">Night Muzzle Flash</a>

And since Boomer asked me so nicedly and so repetatively and forcefully, :P I give him some credit for this. He did not buy anything or design anything, but I give him full credit for being a decent <a href="http://dictionary.reference.com/browse/flunky">Flunky</a>.
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Last edited by sgort87 on Mon Jul 17, 2006 11:05 pm, edited 1 time in total.
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Unread postAuthor: rna_duelers » Mon Jul 17, 2006 1:45 am

Wow...Thats quite a cannon you have there,how far does it launch a sabot full of rocks/dirt etc?How do you fire it because trying to hold that would blow you on your a$$..Nice cannon so how big will the propane meter be? 2"pipe..lol...Nice cannon
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Unread postAuthor: trae08 » Mon Jul 17, 2006 11:45 am

thats awsome frakin sweet dude
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Unread postAuthor: benstern » Mon Jul 17, 2006 1:38 pm

That will require a friggin huge propane meter. Like a foot of 1" pvc!
Nice find!!!
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Unread postAuthor: SpudStuff » Mon Jul 17, 2006 1:45 pm

thats huge. how much does it weigh and do you only aim it streight up.

good job paint it.
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Unread postAuthor: )DEMON( » Mon Jul 17, 2006 2:34 pm

If I had that my little sister would definately be used as ammo. GREAT JOB!, it is huge!
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Unread postAuthor: SpudStuff » Mon Jul 17, 2006 3:31 pm

lol hope she has a helmet
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Unread postAuthor: SpudStuff » Mon Jul 17, 2006 3:56 pm

you have a truly messy yard
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Unread postAuthor: sgort87 » Mon Jul 17, 2006 4:29 pm

It's messy from the build and people threw stuff from the pool too.

Ben and RNA, it would need 30" of 1" pipe at 100 psi for a meter.

I usually only shoot it straight up because it would be hard to keep things in the sabot at other angles and because recoil doesn't affect anything and nothing is in danger of a plug blowout.

As for weight, heavy. The scale reads about 85 pounds. That sounds right.
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Unread postAuthor: SpudStuff » Mon Jul 17, 2006 4:58 pm

will you give away the broken old cannon(blue flame) if so can i have it
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Unread postAuthor: sgort87 » Tue Jul 18, 2006 6:52 pm

I don't plan on giving it away. I'd like to keep it as a memoir.
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Unread postAuthor: SpudStuff » Tue Jul 18, 2006 7:00 pm

ahh well okay. how loud is the cannon. u can imagine it would be insainly loud. also is the plug made of ply wood or solud wood
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Unread postAuthor: M3NT4L » Wed Jul 19, 2006 12:05 am

thats big bigger than the barrel used in the "mythbusters"show when they shot frozen chiken at airplane windows to test somesort of myth... w/e but that thing shot CHIKENS faster than my canon shoots taters urs is biger but ur chamber is basicaly the same as ur barrel so thats less power right but that must be fun to shoot wow dude
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Unread postAuthor: sgort87 » Wed Jul 19, 2006 6:35 pm

The plug is made from solid wood.

The one on Mythbusters was probably 10" and was used for testing the frozen vs thawed chicken shot at glass myth.

The C:B ratio is calculated to be .75:1 to give the best shot possible. 45" is barrel, 34(ish)" is chamber.
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Unread postAuthor: SpudStuff » Wed Jul 19, 2006 7:10 pm

yes the one on mythbusters is 10" i have personally seen it. I was at the store when the got it
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