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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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mini hybrid win!

Unread postAuthor: jackssmirkingrevenge » Mon Sep 06, 2010 12:08 pm

haha!



If you look carefully at the base of the chamber, you can actually see the flash of combustion glow through the foam and epoxy plug :D

edit: youtube embed
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Last edited by jackssmirkingrevenge on Wed Nov 06, 2013 5:26 am, edited 1 time in total.
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Unread postAuthor: clemsonguy1125 » Mon Sep 06, 2010 12:11 pm

Nice job. What mix was that at, impressive.
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Unread postAuthor: Marffy » Mon Sep 06, 2010 12:20 pm

cool, how come you didn't hold it?
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Unread postAuthor: qwerty » Mon Sep 06, 2010 12:29 pm

cool, how come you didn't hold it?


Would you like to hold an experimental hybrid without knowing whether it will blow up or not?
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Unread postAuthor: jakethebeast » Mon Sep 06, 2010 12:34 pm

hey that looks promisin! what was the ammunition?
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Unread postAuthor: Heimo » Mon Sep 06, 2010 1:00 pm

cool, at least this time it worked, any idea on muzzle velocity?

also what did you use for a burst disc?
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Unread postAuthor: Gun Freak » Mon Sep 06, 2010 1:11 pm

Nice job! Same questions as above :wink: I like the flash!
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 06, 2010 1:15 pm

qwerty wrote:Would you like to hold an experimental hybrid without knowing whether it will blow up or not?


The man makes a good point ;)

This was at 6x using photo paper as a burst disk. I can't get it to ignite any higher with piezo ignition, I might have made the spark gap a little too wide.

Also sometimes the disk doesn't burst, the chamber gets very hot and when you open the schrader an amusing whiff of smoke comes out. As you can see the chamber is now much more substantial and will happily take the pressure, unlike my previous effort.

Ammunition is a 0.22" airgun pellet (barrel is 5.5mm I/D brass tube), I didn't chrony it but to be honest muzzle energy isn't that impressive - however as someone accustomed to HPA launchers I'm not easily impressed :roll: a pellet at 6x made a big dent in 0.6mm steel sheet but did not penetrate. My PCPs firing the same pellet at 850-900 fps will happily punch through the same target.
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Attachments
minihybridsetup.JPG
fuelling and firing setup, with blowlamp butane/propane fuel source, syringe meter and cigarette lighter piezo ignition.
minihybriddetail.JPG
detail of the breech and ammunition. The threaded portion is taken from an electrical connector set in epoxy, note the chamber wall thickness.
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Unread postAuthor: CpTn_lAw » Mon Sep 06, 2010 1:49 pm

Nice!!!!!!!!!!!!!
Honestly happy you succeeded!
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 06, 2010 2:00 pm

Thanks :) without your ignition/mix advice it wouldn't have happened :)

Not sure if it's worth pursuing in this calibre though, given the power. It was far from supersonic, so no real benefits over an HPA pneumatic of the same size. Still interested in hybrids as a cartridge fed device though... and maybe a 12 bore 8)

One small footnote for those who think that there is no progress on the forums, this used to be considered a "mini hybrid" :D
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Unread postAuthor: Gun Freak » Mon Sep 06, 2010 2:06 pm

WTF that links to a 3x hybrid with a DWV cleanout cap, lol. Certainly our safety standards have gone up, :lol:
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Unread postAuthor: POLAND_SPUD » Mon Sep 06, 2010 2:21 pm

cool, how come you didn't hold it?

Would you like to hold an experimental hybrid without knowing whether it will blow up or not?

I think it was ironical reference to his fails :wink:

@JSR
lol you've got a threaded connection on it... HERESY!! :twisted:

muzzle energy isn't that impressive
what you are waiting for... go for 10X mix :D
MOAR is a good thing[/quote]
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 06, 2010 2:24 pm

POLAND_SPUD wrote:what you are waiting for... go for 10X mix :D
MOAR is a good thing


It usually is, but in this case MOAR than 6x isn't igniting...
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Unread postAuthor: jakethebeast » Mon Sep 06, 2010 2:57 pm

hit a small dent just at the end of epoxy so the spark gap will be little smaller :D
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Unread postAuthor: CpTn_lAw » Mon Sep 06, 2010 3:01 pm

Yeah I'd follow that advice... spark grap really needs to be small.
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