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Coaxial Combustion Barrel Support

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Coaxial Combustion Barrel Support

Unread postAuthor: iturnrocks » Tue Jul 17, 2007 10:09 am

I recently built my first gun- an over/under metered propane combustion.

After seeing photos of the Locutus without the barrel I have been thinking about building a similar looking coaxial. Most of what I have read about combustion coaxials is that there is not enough support for the barrel inside the combustion chamber. I have a few ideas bouncing around in my head about this new gun- here is how I intend to support the barrel inside the chamber. The idea is to dremel out the material around a 4"-2" ABS reducer, leaving enough to support the inner barrel. The coaxial barrel will screw in to the outer support and the barrel will snug up to a 2"-1 1/2" reducer on the inner support.

Image

My gun will be made of 4" ABS for the chamber with a 1.5" removable PVC barrel. The threads will be at the end of the chamber per boilingleadbath (08/2005).


A second idea is to use various barrel configurations to convert this gun from coaxial to inline to over/under depending on which barrel I choose.

I probably wont be able to start working on this gun till I move next month. I will show photos once I start working on it. I have already bought all the pipe components ($75).

-Dan
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Unread postAuthor: spudthug » Tue Jul 17, 2007 10:32 am

believe me..combustion coaxials are not worth it..they arent powerful..and the ones i have built are shitty and can only throw a potato like 50 yards...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: iturnrocks » Tue Jul 17, 2007 10:44 am

spudthug wrote:believe me..combustion coaxials are not worth it..they arent powerful...


Does anyone know why they arent powerful? Has a comparison been done with a coaxial and an inline with the same volume combustion chamber/ barrel size?

I suppose if this turns out to be true for me, I will just screw in the over/under barrel or the inline barrel.
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Unread postAuthor: boilingleadbath » Wed Jul 18, 2007 12:05 pm

Co-axial combustions tend to preform poorly because:
1) It's hard to get a proper, even mixture in them.
2) They hard to vent effectively.
3) The shape of the combustion cavity is not ideal for burning stuff in.

(not sure about the order of importance there)
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Unread postAuthor: iturnrocks » Wed Jul 18, 2007 1:55 pm

boilingleadbath wrote:Co-axial combustions tend to preform poorly because:
1) It's hard to get a proper, even mixture in them.
2) They hard to vent effectively.
3) The shape of the combustion cavity is not ideal for burning stuff in.


Heres my solution to #2. Im still working on #1, and I will probably be stuck with #3.

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Unread postAuthor: iturnrocks » Wed Jul 18, 2007 2:14 pm

iturnrocks wrote: Im still working on #1


Heres the general idea for #1 if I can find a small enough fan. I may use 2 or 3.

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