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my first hybrid

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: starman » Sun Jan 18, 2009 2:09 pm

Don't give up and close that 3 mm gap down further to 1 mm or less if you can.
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Unread postAuthor: Ragnarok » Sun Jan 18, 2009 3:25 pm

Manometric metering shouldn't be all that hard. If you're adding everything to the right extents, the problem is, like starman suggests, almost certainly with the ignition.

ALIHISGREAT wrote:yes but then your air filling set-up will be venerable to the blast....

Just to let you know, venerable (old/wizened, and by it somewhat impressive) and vulnerable (at risk or harm or damage) are rather different in meaning.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: ALIHISGREAT » Sun Jan 18, 2009 4:01 pm

oops stupid google chrome spell check :roll:
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Unread postAuthor: STHORNE » Sun Jan 18, 2009 4:22 pm

looks pretty good for your first, keep up the good work!

damage pics soon i hope? :lol:
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Unread postAuthor: Hotwired » Sun Jan 18, 2009 4:25 pm

One step at a time. It needs to fire first :)
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Unread postAuthor: maggotman » Sun Jan 18, 2009 5:18 pm

what else can i use as an ignition source ? will a camra work and how do you wire it up etc ?
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Unread postAuthor: CasinoVanart » Sun Jan 18, 2009 11:37 pm

Your spark should be fine using what you are using. All my Hybrids fire with a BBQ ignitor up to 9x, with around a 1mm gap.

Get a syringe and some Butane, load the fuel directly through the ball valve from the syringe. Has worked for me every time.

Good luck.
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Unread postAuthor: psycix » Mon Jan 19, 2009 6:14 am

3 mm gap?
3x9 = 27 mm
Thats over an inch. Can your spark jump that on atmospheric pressure?
You certainly need to close the gap to less then one mm.


And for gods sake, NEVER, EVER look down the barrel of a loaded gun, even when its "just" 200 psi and a burst disk. If the disk failed and its shrapnel gets blown in yer face, well, you'll have a bad day.
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