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Chamber Volume

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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Chamber Volume

Unread postAuthor: shiftyguy » Fri Feb 29, 2008 11:00 am

I have noticed many/most of the Hybrids are small in chamber volume. I was considering making one 3" x 14". Is this too big, what are the guidelines one should follow for hybrid chamber/barrel considerations, also looking to shoot golfballs a mile.
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Unread postAuthor: Jared Haehnel » Fri Feb 29, 2008 11:16 am

I've seen large hybrids before there is no real restriction in making one as long as your pipe is able to stand the added pressure of combustion... having never made one I probably shouldn't be giving advice...

It would seem as though the added cost of material usually would a lot of people from making the bigger hybrid cannon resorting to a large chamber pneumatic...however don't quote me
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Unread postAuthor: SpudFarm » Fri Feb 29, 2008 12:09 pm

that seems in the range of safety if you use steel! just place the spark in the middle of the chamber to reduce the chance of DDT but with a 14" long chamber you are pretty much fool safe:)
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Unread postAuthor: Jared Haehnel » Fri Feb 29, 2008 12:15 pm

fool safe:)


Dangerous words, my friend, dangerous words....
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Unread postAuthor: STHORNE » Fri Feb 29, 2008 12:53 pm

steel isn't really that expensive so i don't see the real reason why there aren't more "large class" hybrids. But when it comes down to pennies and nickels, i guess people just want a "hybrid" and not an "outstanding hybrid".
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Unread postAuthor: Jared Haehnel » Fri Feb 29, 2008 1:00 pm

I've heard of people making them from sch 80 I don't know if its any cheaper or if its safe but it certinatly would be easier to put intsall chamber fan and a spark ignition.
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Unread postAuthor: STHORNE » Fri Feb 29, 2008 1:06 pm

yeah, I've heard of that too. It would be a lot cheaper but as of means of safety, it can't compare with steel, although it would work fine as a combustion. and it would be a lot easier to install the fan and spark ignition, thats one major advantage.
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Unread postAuthor: Jared Haehnel » Fri Feb 29, 2008 1:12 pm

Good luck finding the pipe and fittings. I don't do much online shopping but around here it doesn't seem like anyone sells the stuff.... always a draw back.

Your right, compare to steel pipe sch80 doesn't compare, however with in reasonable pressures you shouldn't have to worry...
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Unread postAuthor: STHORNE » Fri Feb 29, 2008 1:15 pm

I'm sure your local pluming store has all the pipes/fittings you need to make a lethal potato gun.

and yes, with reasonable pressures, you have nothing to lose
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Unread postAuthor: Jared Haehnel » Fri Feb 29, 2008 1:17 pm

Well...this local plumbing store don't have any...but don't let that deter you 8)
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Unread postAuthor: STHORNE » Fri Feb 29, 2008 1:21 pm

ummmm...do you have a menards, fleetfarm, home depot? any hardware stores by you?
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Unread postAuthor: Jared Haehnel » Fri Feb 29, 2008 1:27 pm

Maynards? Home depot yes... I actually work at a hardware store but I gues there isn't a high demand for this stuff so no there isn't any one in the immediate area who carries the stuff...I've had peopel ask for it before we can't evne order it in from our warehouse go figure the only time I would ever get a discount...
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Unread postAuthor: STHORNE » Fri Feb 29, 2008 1:30 pm

hmm, thats weird. I don't know what else to tell ya then, if you don't want to shop online and you don't have any local stores who carry the parts, your at a dead end. you could try salvaging parts from what people throw away or go to a junkyard and try to look for/buy stuff.
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Unread postAuthor: Jared Haehnel » Fri Feb 29, 2008 1:32 pm

I don't need it now nothing I am building required that heavy of a pressure pipe... but he might be interested in it if he's building a hybrid...
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Unread postAuthor: D_Hall » Fri Feb 29, 2008 1:45 pm

Jared Haehnel wrote:I've heard of people making them from sch 80 I don't know if its any cheaper or if its safe but it certinatly would be easier to put intsall chamber fan and a spark ignition.


I presume you mean sch 80 PVC (there's sch 80 steel pipe as well)
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