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A Few Hybrid Questions

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: jimmy101 » Sat Feb 23, 2008 8:09 pm

hubb017 wrote:Right now, I JB Welded the wires to the electrodes (although I wished I'd have used the clips) and it works perfectly.

I suspect that if you grab the wires with pliers you can crush the JB Weld and get everything to come off the electrodes. It is pretty tough to make a permanent glue joint to chrome steel.

But, as long as it works, who cares?
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Unread postAuthor: Hubb » Sat Feb 23, 2008 10:46 pm

Yeah. I considered that, which is one of the reasons I used the JB Weld. I put a cap over it, much like the PVC cap over the stun gun at Burnt Latke. I made it so it can't be pulled off by accident.

Hopefully, the rain will stop and I can shoot it soon.
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Unread postAuthor: Hubb » Wed Feb 27, 2008 6:13 pm

It worked perfectly! My first hybrid :D

I shot it three times, and was successful three times. My boy, really got a kick out of it and it scared the crap out of my wife. It didn't break any windows, though (I told my wife I wanted it loud enough to break a window in the house).

Details:
1" union
2" x 12" chamber
1/4" propane meter
stun gun ignition
Gatorade lid burst disks

Nothing fancy, but still a hybrid. I didn't want to start a new thread without pictures and they should be available sometime.
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Unread postAuthor: Lentamentalisk » Thu Feb 28, 2008 1:16 am

omfg! Gatorade lid? that is a high psi burst... do you really need something that strong for a 1" union?
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Unread postAuthor: Novacastrian » Thu Feb 28, 2008 1:22 am

hubb017 wrote:It worked perfectly! My first hybrid :D


Hey well done mate :) I am sure that you will be getting endless hours of fun with it, can't wait till you post it :P

@lent, this is a Hybrid, as such a burst disc that ruptures at around 200psi seems perfectly reasonable to me.
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Unread postAuthor: Hubb » Thu Feb 28, 2008 1:30 am

Yeah, already do.

Hey, Nova, a while back when I asked about sealing the union, well, when I grind the Gatorade lid down, I put a couple layers of teflon around the edges of the burst disk and it seals great, without the use of a washer or o-ring (and my gasket seal didn't work too well).

I've noticed the some post pics of the ruptured burst disks. Well, with this one, I removed the union to get the ruptured burst disk, only to find that the entire thing was blown out of the barrel. It did this on every shot, but I had not problems with the fire. Is that normal?

(I couldn't even find it on the ground anywhere. I assume it blew it into pieces).
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Unread postAuthor: Novacastrian » Thu Feb 28, 2008 1:38 am

Seems quite normal, the material used to make those lids is rather brittle, as such it most likely is shattering into many pieces, this is good as there is no flow restriction at all, compared to other softer burst discs that only rupture in the middle.
I say you are onto a good thing, stick with it!

Edit: Maybe this would be a good time to invest in Gatorade shares. :D
Find a similar material and punch out your discs, that is if you don't want to be drinking a lot of Gatorade!
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