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advanced combustion cannon ideas

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: sgtmik » Mon Feb 08, 2010 11:22 am

Spud Bud
know i can get more power out of a pneumatic but the problem is that i don't have a compressor and if i were to buy one portability will be an issue. And I don't think pumping up a dual chambered air cannon with a bike pump will be too efficient...


If you don't have a compressor, buying one will be expansive and actually the cycle time will be just as long if not more long than a propane one. The bigger the tank, the smaller your compressor, the longer it will take you to shoot off a couple shoots.

My final word, go for a combustion. I am tellin' ya. Go for combustion. I have both and I enjoy my combustion for big projectiles and my air riffle for small projectiles. Here's a link to EASILY calculate your ratios and meter length, pressure etc. I found it easy to use and that using it made the construction of my combustion canon A LOT EASIER.

http://www.burntlatke.com/ft_live.html
You should know that the fuel mixture and atmospheric pressure has to stay as it is.
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Unread postAuthor: Spud Bud » Mon Feb 08, 2010 1:36 pm

Yea i was hoping to break the 900 ft/lb barrier.
Considering i made a dual chambered pneumatic with two 3'' chambers, 24'' long, will it take a vast amount of pumping to get it up to 100PSI? I was researching a bit on the piston valves and i think i would be able to make one but then again the pumping will probably take a very long time and will be tiresome I suppose.
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Unread postAuthor: sgtmik » Mon Feb 08, 2010 2:09 pm

Im tellin ya dawg. Go for combustion
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Unread postAuthor: Spud Bud » Mon Feb 08, 2010 2:25 pm

sgtmik wrote:Im tellin ya dawg. Go for combustion


I am going for combustion..how much didn't cost you to make yours?
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Unread postAuthor: McCoytheGreater » Tue Feb 09, 2010 1:03 am

Hubb wrote:Is there any other reason to go with a combustion? :wink:


The only other reason I can think of is against forum rules.

Edited by BTB.It was still too obvious..
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Unread postAuthor: sgtmik » Tue Feb 09, 2010 10:33 am

[/quote]Spud Bud
I am going for combustion..how much didn't cost you to make yours?
About 100$ actualy. It wasn't too bad. But I added stuff since then so now it cost me about 20$ more. And it includes the 13% taxe i am paying (fork the canadian taxes!!). So for a hundre bucks, i think you are go to go. Don't buy a chamber fan yet. Go for the main component. Chamber, barel, propane, propane meter and ignition (BBQ).
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Unread postAuthor: Hubb » Tue Feb 09, 2010 12:57 pm

sgtmik wrote:Im tellin ya dawg. Go for combustion
That statement is just about sig-worthy... :lol:
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Unread postAuthor: sgtmik » Tue Feb 09, 2010 5:43 pm

God! Can anyone help me doing a good well made quote. I donT understand how they work!
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Unread postAuthor: Spud Bud » Tue Feb 09, 2010 7:12 pm

Alright then, when i gather up all the components,hopefully under a month :? , I will post up some pics of the finished cannon. Thanks
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Chamber length estimate is too long

Unread postAuthor: DR » Tue Mar 09, 2010 3:20 pm

In your beginning post, you stated:

I was thinking of a 4in chamber, 25in long with either a golf ball, tennis ball, or plain'ol 2in barrel of possibly even all these setups with interchangeable barrels.


With a 25 inch long, 4" SCH40 Chamber - you would need a golf ball barrel that is 197-1/2" long. (almost 16-1/2 feet)...

you would need a tennis ball barrel that is 95.49" long (almost 8 feet)...

you would need a "plain 'ol 2 inch barrel" that is 136 inches long (11' 4")

Surprises me that everyone had overlooked this. This topic was posted what... a month ago? I hope that dude didn't really make his chamber that long.

The most important thing you need to do before building your chamber, is determining what size/length barrel you will slap on it.

The biggest barrel would be the 2-1/2" Tennis Ball barrel. The chamber would only need to be just shy of 19" long, to support (volume-wise @ 0.7:1) a 6 foot long barrel. - Total length: just shy of 8 feet.

So, unless you weigh over 140 pounds soaking wet... that's a huge cannon to handle.

A 4-foot long tennis ball barrel is much easier to handle and the chamber only need be a little over 12-1/2" long.


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