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multi section barrel

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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multi section barrel

Unread postAuthor: spcolsson » Sat Dec 24, 2011 9:01 pm

Ok so Xavior is born and im itching to build yet another cannon. One problem i always seem to run into though is transportation seeing as i live in the middle of savannah i can only use my cannons so much before people catch on that those loud bangs arnt the shot gun range down the street so i would like to be able to brake down my cannons and take them out were i can relatively be alone to us them but i run into the problem of only having a sport compact and a avenger any one know how i could make a multi section barrel that way i can have a barrel over 4' and still transport it?
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Unread postAuthor: Fnord » Sat Dec 24, 2011 9:18 pm

I could potentially see a multi-section golf-ball barrel being possible.
You can use 1.5" sdr21 pvc pipe sleeved inside 2" sch80, with a male/female coupling glued on to the 2" pipe. You'll want leave the sdr21 sticking out of the coupling a few inches for best possible alignment when you assemble them.
You might have to sand out the male coupling a bit though.

If you're using steel pipe, just use threaded ends and use a non-tapered conduit coupling. Cut it down until the pipes fit flush when screwed in all the way.

OR!

Couldn't you just use the shotgun range?
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Unread postAuthor: spcolsson » Sat Dec 24, 2011 9:25 pm

thanks for the ideas unfortantly the shotgun range is a club thing and i kinda pissed off the owner with my truck when i had it by going on the land the range is on and getting some dead trees for fire wood....... long story
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Unread postAuthor: DYI » Tue Dec 27, 2011 11:19 am

Doing this with any sort of standard fittings is going to lead to blowby at the joint. Unions could be used if you're content with blowby.

Otherwise, the following may be worth consideration:

On the mating ends, glue a coupling with the center stop removed onto both pipes. Have a hole the same diameter as the outer diameter (OD) of the barrel cut into two aluminum or steel plates, and a bolt circle drilled into them centered around the hole (any more than four bolts would probably be excessive). The barrel sections go through the central hole on these plates, one plate for each section, butted up against the couplings at the joint. Cut a third section of barrel tubing at least as long as twice the socket depth of the couplings so that the two barrel sections will fit together when this section is placed in the two couplings. Then just put it all together as explained above, run bolts through the holes, and tighten. External support for the barrel around the joint may be necessary due to the shallow socket depth of the couplings, but at least you'll have a roughly smooth interface between the barrel sections.
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