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hybrid cartridges

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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hybrid cartridges

Unread postAuthor: carter » Sat Dec 29, 2007 10:01 pm

ok now that i had have sorted out spark problems, i've started out with designs; playing with ratios and size ideas. while doing research on these using the old spudtech forums i came across this - http://www.spudfiles.com/spudtech_archi ... hp?t=15702
which got me thinking hard about a few problems with hybrids, actually with all guns. the charging. then the idea came pre-made chambers or cartridges.

what i am thinking is making a all in one cartridge. including ammo, sparkers, gas and burst disc.

how i was going to inter grate this into the gun is to make a rear loading cartridge housing. that is shut off using a gate at the rear to hold the cartridge in place. sealing the front of the cartridge isn't a problem as i will sleve it into the barrel and seal it most likely using o-rings.
the only thing that is bugging me is how i will allow the spark to the cartridge. my first thought came to me from a torch. how the battery touches the light housing allowing power to hit the light. mounting a system like this to the back or top. actually you could put this anywhere to allow power to run to the sparkers.

all i need to no is; will it work, what problems i could get and is there a way to better the plan?

cheers
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Unread postAuthor: rp181 » Sat Dec 29, 2007 10:34 pm

nice idea, for the ignition, i would try rocket motor igniters, that way there is no high voltage.
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Unread postAuthor: carter » Sat Dec 29, 2007 10:42 pm

i'm in aus. so thats a problem we can't make rockets.
also the gun would be steel for safety so i have to factor in problems caused by this
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Unread postAuthor: Hotwired » Sun Dec 30, 2007 4:19 am

I sketched up a hybrid cartridge system a whiles back, all it needed was two metal rings on the cartridge and two sparking probes inside.

Hybrid RPG

No it's not really a rpg :wink:
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Unread postAuthor: carter » Sun Dec 30, 2007 6:08 am

cool idea but the problem still comes with the safe all steel construction. i'm stumped atm so i just need a few ides
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 30, 2007 6:14 am

here's some experiments I had done with combustion cartridges, I managed to get it to eject succesfully but the project was shelved.

The idea for a hybrid cartridge is not new and has been proposed several times, this was my design but never got round to making it.

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Unread postAuthor: carter » Sun Dec 30, 2007 6:17 am

would cast epoxy be strong enough and seal well enough for it. thats pretty much the idea i had in my head. if you think it can seal well and not blow out for a 8 mix i will make a proto type cartridge.
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 30, 2007 6:31 am

Proper epoxy done well should be more than enough to restrain the pressure.
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Unread postAuthor: ALIHISGREAT » Sun Dec 30, 2007 6:32 am

the epoxy holding the ammo in place would 'burst' at different pressures every time and be inconsistent... so surely a burst disc would be better although it would spoil the clean lines of the cartrage.
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Unread postAuthor: jackssmirkingrevenge » Sun Dec 30, 2007 6:41 am

ALIHISGREAT wrote:surely a burst disc would be better although it would spoil the clean lines of the cartrage.


Well, I had this idea for a burst disk cartridge (not a hybrid though), it would require some machining to be done.

Image

Actually, now that I've had it up to *indicates area well above head* here with reciprocating bolts, I might just give this idea some more consideration...
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Unread postAuthor: carter » Sun Dec 30, 2007 6:41 am

used at the rear to house the wires though would it hold. mine will use a burst disk
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Unread postAuthor: ALIHISGREAT » Sun Dec 30, 2007 6:44 am

looks cool, i was gonna suggest you start up this idea again after your failure but you already seem to have thought of that.

p.s. woo i got a title :D
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