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Coaxial Hybrid

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Coaxial Hybrid

Unread postAuthor: noname » Fri Aug 04, 2006 8:01 pm

Anyone ever made a coaxial hybrid? I would but I don't built any combustions or hybrids or anything.
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Unread postAuthor: Velocity » Fri Aug 04, 2006 8:51 pm

I doubt anyone would ever try it. It is extremely dangerous, for a few reasons.

One, the barrel is in the combustion chamber, which could cause it to implode.

Secondly (and obviously the more significant reason) is that coaxials require modified bushings up near the end of the chamber (to allow the barrel to pass through). This is undoubtedly a very weak point compared to the other parts.
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Unread postAuthor: saladtossser » Fri Aug 04, 2006 9:02 pm

r u talking about one with a piston? it's possible.
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Unread postAuthor: WOW!! » Fri Aug 04, 2006 9:04 pm

Yea you could do it, and the part were the barrel goes though is better because it gives more glueing area.
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Unread postAuthor: mark.f » Sat Aug 05, 2006 7:02 am

ANYTHING you modify could be a weak point.
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Unread postAuthor: Brian the brain » Sat Aug 05, 2006 10:19 am

or...

anything YOU modify could be a weak point.
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Unread postAuthor: noname » Sat Aug 05, 2006 11:13 am

Put a buttload of screws at a slant inward to the barrel, and file the screws smooth inside the barrel. OR just make the whole thing out of metal.
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Unread postAuthor: WOW!! » Sat Aug 05, 2006 11:56 am

So if I take some PVC pipe and mdify it in to a combustion cannon it is a weak point?
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Unread postAuthor: Velocity » Sat Aug 05, 2006 12:12 pm

yes it is a weak point. But because combustions do not generate THAT much pressure (102 PSI for propane under IDEAL conditions; usually its only around 40 PSI), so it is not a factor.

Hybrids, on the other hand, generate incredible pressure; people are worried about SCH 80 hybrids. If you modified a SCH 80 part, then it would become a weak point. Hybrids are much better at "exploiting" weak points than pneumatics (used at 100 PSI or less) and combustions
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Unread postAuthor: rna_duelers » Sun Aug 06, 2006 12:57 am

Coaxial hyrbrids have been made an used,i belive Rambo has made one and that is the next most used design apart form the burst disk hybrid.But i dont no what mix they have been taken to.
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