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12/12/06 Big Update - The Taternator II Aluminum Spud 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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Unread postAuthor: sgehring » Wed Nov 29, 2006 9:57 pm

unfreaking believeable. Best I have ever looked at
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Unread postAuthor: rna_duelers » Thu Nov 30, 2006 12:09 am

Holly crap a rat!This thing is one wicked looking spud gun!But for the cost you would want it to be very good.

This thing would have no worries making a supersonic projectile with an some more atmospheres and some extra fuel.

Definitly go for the oxy/acetylene mixture :wink: it would be very very very very FREAKING COOL!

You are my new personal jesus,well in spudgun construction anyways.
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Unread postAuthor: Pyro Ninja » Thu Nov 30, 2006 3:14 am

That is mad the army should have that, lol any way its really cool :D
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Unread postAuthor: squeaks » Thu Nov 30, 2006 9:14 am

How heavy is that thing with all those metal parts(minus the stand of course)?
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Unread postAuthor: Dumbascii » Thu Nov 30, 2006 6:04 pm

Sorry to gang up replies like this. I didn't expect so many reactions!

natev3790 wrote:...does the scope even work that great with the big size ammo?

The scope definitely works. The odd shaped slugs still wave around in the wind, but on average you'll hit inside a 1' circle at 100'. After that, all bets are off. I'm sure that simple metal sight would achive exactly the same result, but the scope looks much cooler. It was the cheapest crap scope at Wal Mart.

ProfessorAmadeus wrote:... Whats the chamber diameter?

3", 20" long.

squeaks wrote:How heavy is that thing with all those metal parts(minus the stand of course)?

The gun itself is up around 60 pounds now. The barrel / clamp assembly is easy to remove, so it fits in my car and is easier to carry. In the outdoor photo, the red tilt base (brazed steel stock) and the black swivel base (extra-heavy-duty chair swivel) above it stay attached to the gun when it's off the tripod and add another 15 pounds or so. All that mass is good though, as it absorbs most of the recoil.

rna_duelers wrote:This thing would have no worries making a supersonic projectile with an some more atmospheres and some extra fuel. Definitly go for the oxy/acetylene mixture :wink: it would be very very very very FREAKING COOL!

I'm thinking that oxy/acetylene is inevitable. I have a remote trigger so I can stand behind a tree. I'm not so sure about supersonic though. Check out this site where they built a 20' long barrel on a pneumatic. The thing pulverizes cinderblocks with a potato and punctured a steel computer case with an ice slug. Excellent videos. http://jacoblarson.org/Spudcannon/ We'll see how the 8' barrel trials go. I don't have enough combustion chamber to use a 20' barrel.
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Unread postAuthor: drac » Thu Nov 30, 2006 9:35 pm

You would have enough for a 20' barrel if you used multiple mixes, like 3-4 atmospheric mixes, search around here on hybrids if you don't understand the concept.

Oxygen and mapp though could send it supersonic with a 20' barrel, but i'm not sure if the potato would survive.
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Unread postAuthor: schmanman » Thu Nov 30, 2006 9:48 pm

go for it. 20' long barrels are fun. do you work at a machine shop or something? because that looks like some pretty nice machining there. stick around. you are a welcome addition to the forum. :D
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Unread postAuthor: Dumbascii » Sat Dec 02, 2006 12:03 pm

drac wrote:You would have enough for a 20' barrel if you used multiple mixes, like 3-4 atmospheric mixes...

Hmm... The way the barrel closes, I could use a flat plastic wafer as a burst disc - very simple. I could probably do away with the metering pipes. Pressurize the chamber with MAPP to regulated pressure, then continue to pressurize with oxygen to the higher oxy regulator setting. I'd have to add gaskets to the chamber ends to prevent slow leaking. Have to eliminate low-flow valve. Replace fresh air check valve with a ball valve. Acetylene becomes unstable above 15PSI, so I'm favoring MAPP right now.

schmanman wrote:go for it. 20' long barrels are fun. do you work at a machine shop or something? because that looks like some pretty nice machining there. stick around. you are a welcome addition to the forum. :D

I'm an IT geek, former pro audio engineer. Some of what I know came from metal shop in high school (23 years ago!) and some more experience at a job making anesthesia ventillators (many instricate machined parts). I'd really like to own an old Bridgeport . . .
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Unread postAuthor: rna_duelers » Sat Dec 02, 2006 8:20 pm

Bridgeport rotary Engine?Is that what you mean?If so what type,12A 13B?

Well a 2x atmosphere mix only requires 14.7(give or take on weather conditions,elevation atmosheric pressure etc)And even if it does become unstable what is the worste it could do??Fire you cannon,which is what you plan to do no doubt if you have acetylene in it.
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Unread postAuthor: beebs111 » Sat Dec 02, 2006 9:13 pm

the only thing i see wrong is that you wouldn't control when it fired. there is a concept gun designed by fiveseven that operates off of this principle(not really important, just intreresting)
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Unread postAuthor: nicholai » Sun Dec 03, 2006 10:32 am

rna_duelers wrote:Bridgeport rotary Engine?Is that what you mean?If so what type,12A 13B?


No he means a bridgeport milling machine, they are pretty much bulletproof
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Unread postAuthor: Dumbascii » Sun Dec 03, 2006 10:42 am

beebs111 wrote:the only thing i see wrong is that you wouldn't control when it fired. there is a concept gun designed by fiveseven that operates off of this principle(not really important, just intreresting)

Could operate as a diesel. THAT would be unique. Build pressure until it spontaneously goes off. Or pressurize, then set it off with an explosive primer. Definitely heading in a direction I like - actual artillery. :twisted:
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Unread postAuthor: killagorrila99 » Wed Dec 06, 2006 2:57 am

Sorry to gang up replies like this. I didn't expect so many reactions!


Pfft make the most awsome gun on the forums, and expect only a few comments? Pfft! I say goodluck, Build me one for $500! I'll pay you!
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Unread postAuthor: joannaardway » Wed Dec 06, 2006 5:07 am

The words: "Holy Crap" come to mind. That's impressive. I'm going to have to steal it some time.

I don't know when I saw last saw something this sweet - for some reason, machined metal combustions always seem to get incredible responses... I'll have to reasearch into that theory.

And the next thing we know, you'll be building railguns.

Now, where did I put those night vision goggles and ninja blacks?
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Unread postAuthor: zeigs spud » Sat Dec 09, 2006 10:16 pm

SpudStuff wrote:Amazing! That is a sweet gun!

I like how complicated it looks! Did you have many parts already or buy them all for the 700 dollar price?

lol diddo!
but looks complicated but i bet someone with previous spudcannon knolage could get it workin.
again NICE CANNON!!!!
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