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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: Dumbascii » Tue Dec 12, 2006 6:09 pm

Added this post just to draw attention to big update edited into the top of the original post.
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Unread postAuthor: mark.f » Tue Dec 12, 2006 11:07 pm

- Weather was cold, around 28 degrees F. I suspect that this robbed huge amounts of combustion pressure by limiting the theoretical adiabatic temperature.


Lower inital temperature actually leads to a higher molar count of reactants at atmospheric pressure, leading to a theoretically higher combustion pressure. You are not lowering the final combustion temperature that significantly by having the reactants at low temperature. So, I wouldn't worry about that, it's something else. Probably your tank pressure.
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Unread postAuthor: drac » Wed Dec 13, 2006 9:33 pm

Yeah, lower temperature would increase the density of the gasses if I remember chemistry correctly, so as Mark said, it may have been higher combustion pressure, although there would be a limit on it with cold weather.

EDIT: I also suggest that you post this on Spudtech. Join up and post it because there are many members who would crap themselves at this beast of a cannon!
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Last edited by drac on Wed Dec 13, 2006 9:49 pm, edited 1 time in total.
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Unread postAuthor: SpudStuff » Wed Dec 13, 2006 9:38 pm

Dumbascii wrote:
SpudStuff wrote:Did you have many parts already or buy them all for the 700 dollar price?

Every part was made by hand from raw stock.


Every part? Even the small brass fitings?
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Unread postAuthor: drac » Wed Dec 13, 2006 9:52 pm

SpudStuff wrote:
Dumbascii wrote:
SpudStuff wrote:Did you have many parts already or buy them all for the 700 dollar price?

Every part was made by hand from raw stock.


Every part? Even the small brass fitings?


Oh stop being nitpicky. It's an awesome cannon, stop being a sarcastic ass for once. :P
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Unread postAuthor: GOLDLOKS76 » Fri Dec 15, 2006 10:11 am

wow nice i love it is amazing i want it :twisted:
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Unread postAuthor: Brian the brain » Fri Dec 15, 2006 4:53 pm

Amazing craftmanship!!
All I can think is:~WOW!!!
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: Billy Bob » Sat Dec 16, 2006 12:52 pm

Jesus 8) good work .. it looks :shock: evil awesome

Loud enough now to need hearing protection. Really makes your ears ring.

That must be a great feeling ! So it have to be !

What is MAPP i´ve never hear that before and find no informations in internet. Can you give me the chemical sign ?
Do you use pure O2 ? ( yellow bottle ? ) I have never seen a little O2 bottle like yours or is that not pure ?


Great work .... greetings from Europe.
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Unread postAuthor: Dumbascii » Sun Dec 17, 2006 9:01 am

Billy Bob wrote:What is MAPP i´ve never hear that before and find no informations in internet . . . Great work .... greetings from Europe.

Here is a wiki entry about MAPP which is the yellow tank. I'm not sure about availability in europe, but since MAPP is a trademark of British Oxygen Corp (BOC), it is probably available. The oxygen tank is not pictured, but is a small green cylinder from a torch kit like this one.
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Unread postAuthor: joannaardway » Sun Dec 17, 2006 2:46 pm

Mapp is readily available over here in the UK. (Found it in my local hardware store).

In fact, it's barely more than propane for a bottle. Whereas, I understand that anyone in the US pays at least double, if not triple.
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Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
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Unread postAuthor: turbohacker » Thu Dec 21, 2006 1:41 am

how much machine time do you have into that beast :?:
I totaly agree with the guys, that thing is way cooler than the one on spudtech :mrgreen:
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Unread postAuthor: Dumbascii » Thu Dec 21, 2006 9:31 pm

turbohacker wrote:how much machine time do you have into that beast :?:
I totaly agree with the guys, that thing is way cooler than the one on spudtech :mrgreen:

It's hard to add up. I'm not a real machinist, so some parts were effed up and scrapped, some redesigned . . . Probably about 40 hours. To build a new one from scratch would probably take only 20 hours.

The spudtech SP9004 gun is smaller and of a different design, turned instead of milled. There's another turned gun that is much bigger and could probably compete with mine for extreme fuels and power capability:
http://forums.spudtech.com/topic.asp?TOPIC_ID=12971 it's really beautiful.
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Unread postAuthor: beebs111 » Thu Dec 21, 2006 9:37 pm

you should mill a special penetrating projectile out of aluminum, or build some sort of dart made for distance
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in the upcoming presidential election, there will be several candidates who will be running, one of whom is Hillary Clinton. Now WAIT A SECOND!!! I though there was some sort of rule that prevented someone from serving more than two terms in office. Vote Against Hillary: Presidential Elections 08
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Unread postAuthor: Bluetooth » Thu Dec 21, 2006 9:45 pm

Thats pretty funny. Your all discussing how to improve it and he has only posted 9 times :lol: !!
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Unread postAuthor: thrasmussen » Fri Dec 22, 2006 8:50 am

I think it would be nice to have a breach block in the future.
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