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Combustion Competition

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: SpudFarm » Sun Dec 09, 2007 5:42 pm

i suggest making a chamber of sch 80 and use oxy and propane in it but when using these fuels remote is a MUST!! and just use 6% of propane or so and add a little oxygen to get that little increase of power you need but to not blow it on first shot use 3" or something for chamber boogieman shot it at 6x as a hybrid!

but if you are going to use this remember the remote!
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Unread postAuthor: MrCrowley » Sun Dec 09, 2007 5:49 pm

spudfarm wrote:i suggest making a chamber of sch 80 and use oxy and propane in it but when using these fuels remote is a MUST!! and just use 6% of propane or so and add a little oxygen to get that little increase of power you need but to not blow it on first shot use 3" or something for chamber boogieman shot it at 6x as a hybrid!

but if you are going to use this remember the remote!



Highly not recommended, to the OP please don't try this.
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Unread postAuthor: SpudFarm » Sun Dec 09, 2007 5:52 pm

ok sorry bad idea to tell something like that :oops:
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Unread postAuthor: xXunderXcoverXx » Sun Dec 09, 2007 6:09 pm

Wow thanks, regulations are its has to be under $100 and a 2" barrel firing a potato and thats pretty much it I don't know really how burst disk works and how much it costs. I just picked up a 41" of 4" sch. 40 ABS for free and figured That would make a nice camber. And I've decided to go with MAPP gas in stead of propane because of performance issues and I got an extra full one. Another thing I need to ask about is ignition types, what would be the cheapest but most reliable to run on this gun. I have an old coil from my volkswagen and if that would do any good as far as using a muli-spark system. Thanks Guys


Well this gun will have hybrid capabilities because the pressure valve I have has a valve stem on the adapter (kinda hard to explain) but I will never put any type of consecrated oxygen into it maybe compressed air but other than that I want my limbs.
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Unread postAuthor: daberno123 » Sun Dec 09, 2007 6:37 pm

If you're going to have a 96" long barrel you're going to need a very long ramrod or just make it breach loading. You can make it breach loading with a camlock from BC Arms. Also if you're using ABS you won't want to make it any kind of hybrid because it doesn't hold pressure very well and is cellular core (lots of air bubbles in it). I would still use since it was free and it is fine if you're just using it for a combustion.
I can't wait to see this in action.
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Unread postAuthor: SpudFarm » Sun Dec 09, 2007 6:48 pm

xXunderXcoverXx wrote:Wow thanks, regulations are its has to be under $100 and a 2" barrel firing a potato and thats pretty much it I don't know really how burst disk works and how much it costs. I just picked up a 41" of 4" sch. 40 ABS for free and figured That would make a nice camber. And I've decided to go with MAPP gas in stead of propane because of performance issues and I got an extra full one. Another thing I need to ask about is ignition types, what would be the cheapest but most reliable to run on this gun. I have an old coil from my volkswagen and if that would do any good as far as using a muli-spark system. Thanks Guys


on all my cannons i have used a coil and a single use camera! weary strong spark (long and fat)!
you just take the casing of the camera break the light bulb for the flash and solder two wires on the poles where the circuit goes into the flash bulb and atatch them to the negative and positive poles on your coil (dosent matter witch is witch) then run the original main cable on the coil in one screw that you has in the chamber and run another wire from the other screw to the negative pole of the coil!

look at the picture


http://s250.photobucket.com/albums/gg269/spudfarm/?action=view&current=ignition.jpg#
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Unread postAuthor: noob of noobs » Sun Dec 09, 2007 7:02 pm

Are you sure you can't build a hybrid? That could run you less than 100 bucks, would be a better cannon, and in a sense it's kind of a combustion.
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Unread postAuthor: DYI » Sun Dec 09, 2007 7:38 pm

I will now point out a simple fact that I have pointed out inummerable times before, and post it in large font so that you may notice it a bit better than you have all the other times:

ABS is rarely ever cellular core. Most commonly available abs is solid wall, and any that is not will be clearly marked as such.

That said, I don't advocate the use of DWV ABS for use in a chamber holding pressure any higher than it is rated for, but really, stop bashing it. On the whole, it is a significantly better spudgun material than PVC.

Now, onto the actual topic. If the ABS is indeed the commonly available solid wall variety, adding a bit of oxygen (enough for the equivalent fuel of a 2x mix), should be completely fine. If you choose to do this, do not use cleanout caps, which are just asking for some sort of grievous injury. Also, remote firing is obviously highly recommended. If the pipe fails, it will rip lengthwise. I would recommend a 12' long barrel (the longest commonly available in a single piece), for maximum power. Good luck, and stay safe.
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