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mini hybrid win!

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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Unread postAuthor: Labtecpower » Tue Apr 05, 2011 9:03 am

I just want to fill the hybrid completely, so if it has 7 bar in the chamber, the pilot would have the same pressure.

I will just machine a piston with a rubber ring BTB came up with.
In this way I could also just use it as a pneumatic.
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Unread postAuthor: irisher » Sat Apr 09, 2011 12:42 am

I am considering having another go at this hybrid cartridge business but I am unsure of how my current design will fare so I hope to get some second opinions.Image
My question to you guys is this; assuming the ignition is at the front of the cartridge, do you think that the preigntion force on the other side will fight the combustion wave and rob power or will it be overcome immediately once the piston cracks open?
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 11, 2011 12:02 am

The pressure created in the combustion chamber will be far greater than the pre-ignition pressure in the "pilot" area so I don't think you should worry about that.

Also, if this is for a cartridge and you intend to build a number of them, why not have a floating o-ring instead of a one way valve, or just ditch the o-rings altogether and just have a tight fitting piston?
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Unread postAuthor: JDP12 » Mon Apr 11, 2011 12:07 am

OMG.. JSR's alive!!!

Are you back already?
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Unread postAuthor: jackssmirkingrevenge » Mon Apr 11, 2011 12:08 am

Nope, still in sunny España... but my laptop's buggered so I only have internet access at work :s
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Unread postAuthor: JDP12 » Mon Apr 11, 2011 12:41 am

ah.. I see you quickly made up for your absence with a multitude of posts

:wink:
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Unread postAuthor: Lockednloaded » Mon Apr 11, 2011 1:19 pm

Have y'all seen davidvanini's pneumatic burst disk cartridges? Would the same concept not work in copper as a hybrid?
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Unread postAuthor: JDP12 » Mon Apr 11, 2011 1:26 pm

yess.... sort of..

you're suggesting forcing the burst disc into two pipes? I posted a topic about this some time ago, but the problem is that it is extremely hard to do this and get a seal. Especially the type of seal that would be required for high mixes. A union is really your best bet for working with the high pressures generated by a hybrid.
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 12, 2011 10:08 am

I concur with the above, you need a threaded or cam type connector to hold the burst disk even for fairly low mixes.
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 16, 2011 5:40 am

back in my home testing range after a couple of weeks away, decided to have some fun with my hybrid at 15x using a large steel spike as a projectile :D

[youtube]http://www.youtube.com/watch?v=SWGgsGPLhvE[/youtube]

The first shot is with a rather fragile alloy sabot that deformed on ignition, you can see particles emerge from the muzzle before the projectile and the shot is fairly weak.

The second shot on the other hand was with a steel sabot (basically a cut down CO<sub>2</sub> capsule, it was stopped by the granite slab backing the wood...
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Unread postAuthor: Crna Legija » Sat Apr 16, 2011 6:38 am

My hybrid is winning aswell, but i only have a 1ml syringe and need to inject 7.2ml for 10x so iv only done a few 5x shots so far. When my bro goes back to work he can get me a few 10ml syringes. Its was surprisingly loud.
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Unread postAuthor: Skywalker » Sun Apr 17, 2011 8:40 pm

@ Crna Legija: dang it, I was in the office too! Blaspheming Sheen-roller....
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Unread postAuthor: JDP12 » Sat Apr 23, 2011 3:26 pm

JSR-- any updates on this?

Maybe actually make it into a gun instead of a testbed hmm??
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 23, 2011 3:46 pm

I'm going to be away for a few more weeks after Monday, but when I return there's a good chance you'll see a "finished" launcher develop ;)
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Unread postAuthor: JDP12 » Sat Apr 23, 2011 3:59 pm

what would that be.. your sedond? After the Beas 10mm pneumatic?

Hahaha.
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