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bushing vs reduction piece

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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bushing vs reduction piece

Unread postAuthor: ste hughes » Tue Nov 02, 2010 6:25 am

hi guys

building my first MAPP cannon

i have 1 cannon thats powered by hairspray which is awesome but the way i went down from 4" to 2" was pieces of plywood screwed and glued together

its not failed once!

but i dont want to go ghetto with this next cannon

problem is though i can't find a reduction piece that will go from 4" to 2" in the uk - the most it will reduce is 4" to 3" and this piece is about £30 ($50) plus the price of a bushing

so would i be ok if i use a 4" to 2.5" bushing and then use another bushing to take me down to 2"? this will cost me about £10 - that £20 i can spend on paint to make it look awesome

is this likely to be a problem - it will be properly glued and screwed just to make sure

thanks :D :D
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Unread postAuthor: Crna Legija » Tue Nov 02, 2010 7:14 am

as long as the parts you use are pressure rated to 120ish psi it would be fine
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 02, 2010 7:28 am

The plywood and glue approach isn't actually what I would consider ghetto, au contraire it's a cheap and neat solution if done properly :)

Pretty much what I did with my last large combustion, though it was mostly epoxy based.
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Unread postAuthor: Gaderelguitarist » Tue Nov 02, 2010 10:48 am

My two working combustions actually utilize wooden plugs to seal off the chamber. If done correctly, it can be a completely reliable build. This actually reminds me that I need to post one of those two on here. I'm rambling...

To answer your question though, yes.
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