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6mm hybrid design

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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6mm hybrid design

Unread postAuthor: jackssmirkingrevenge » Wed Sep 05, 2007 10:54 pm

As hybrids aren't really my thing, thought I'd run this by the board first - any reason why this design shouldn't work? Any tips and advice appreciated :)
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Unread postAuthor: FeLeX » Wed Sep 05, 2007 11:00 pm

Looks good to me but wouldn't it be hard fueling it since its such a small chamber?
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 05, 2007 11:03 pm

FeLeX wrote:Looks good to me but wouldn't it be hard fueling it since its such a small chamber?


I suppose this will work well enough:

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Unread postAuthor: homedepotpro » Wed Sep 05, 2007 11:05 pm

FeLeX wrote:Looks good to me but wouldn't it be hard fueling it since its such a small chamber?

especially with a shrader valve. when you disconnect some air will leak out, messing with your mix. i don't know hybrids either, but i thought i would just point that out.
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Unread postAuthor: FeLeX » Wed Sep 05, 2007 11:05 pm

Hmm I guess. You would have to make an adapter wouldn't you?
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 05, 2007 11:13 pm

homedepotpro wrote:when you disconnect some air will leak out, messing with your mix.


Not in my case - I added o-rings to my shock pump so when you thread it onto the schrader, it doesn't actually open the stem, the air leaks in thanks to the pressure difference.

You would have to make an adapter wouldn't you?


I was thinking of injecting through the barrel end just as you would with a combustion, closing it quickly with the burst disc then bringing it up to pressure with the schrader.

This isn't the first time I've tried something like this, here's a similar previous effort on spudtech, I just thought I'd give it another go.
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Unread postAuthor: darkmilk » Wed Sep 05, 2007 11:39 pm

what about a pure oxy mix, then he could just use a pressure gauge
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 05, 2007 11:45 pm

Not too keen on using oxygen at this point.
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Unread postAuthor: experament-u2 » Thu Sep 06, 2007 1:34 am

it looks great jack
i love the spark gap means less hole sin your chamber
oh and making a adapter to the schradar valve shouldn't be hard.

good luck with it jack cant wait to see it
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 06, 2007 1:41 am

experament-u2 wrote:good luck with it jack cant wait to see it


I calculate it'll take two epoxy "sessions" so a couple of days ;)

This is a bit of cartridge test, I'm trying to get an idea of power levels to see if it's worth the expense of getting some machining work done professionally.
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Unread postAuthor: dongfang » Thu Sep 06, 2007 2:26 am

Hey,

I like your use of BRASS for a barrel. Finally someone saw the light :) Brass is as easy to machine and to braze as copper, it weighs a little less and it is much harder and stiffer.

Aluminum would be nice too, but there is the problem of joining it to other things; either you need fancy welding equipment, or you have to take chances with glue.

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Unread postAuthor: jackssmirkingrevenge » Thu Sep 06, 2007 2:32 am

I always use brass for airsoft barrels but aluminium would actually be a better idea for the hypothetical cartridge body, a lighter cartridge will lessen stresses on the breech mechanism and be less likely to damage itself when it hits the ground. I don't believe I'd be "taking my chances" with glue, it's pretty strong stuff.
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Unread postAuthor: darkmilk » Thu Sep 06, 2007 2:51 pm

jackssmirkingrevenge wrote:Not too keen on using oxygen at this point.


why not?
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Unread postAuthor: DYI » Thu Sep 06, 2007 3:05 pm

jackssmirkingrevenge wrote:
Not too keen on using oxygen at this point.


why not?


Probably because of the dangers of autoignition and/or detonation that they pose.
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Unread postAuthor: paaiyan » Thu Sep 06, 2007 3:20 pm

What mix will you take it to? And I like the way you use the schrader as part of the ignitor, ingenuity at work.
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