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My hybrid design, help with my questions please

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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My hybrid design, help with my questions please

Unread postAuthor: JDP12 » Sun Sep 23, 2007 6:35 pm

what do you think? Questions are in picture. Click on picture to expand to be able to read everything

actually, i don't think i'll need two spark gaps, i'll probably just use one, and then i would what ground the other wire to the CO2 chamber? do you guys think i need two- i don't think so, it's such a small chamber

<img src="http://i157.photobucket.com/albums/t79/justhavinagoodtime/scan0001.jpg?t=1190590431">
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Unread postAuthor: Novacastrian » Mon Sep 24, 2007 9:16 pm

That drawing is atrocious :(
Little bit more time with your crayons i think :P
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Unread postAuthor: noname » Mon Sep 24, 2007 10:08 pm

Pretty good design, except I'll give you a couple of pointers.

I have no idea whether co2 tanks are aluminum or steel, but it doesn't matter. They can hold 3000 psi, so it's no problem.

Putting a 1/2" nipple and ball valve into the chamber is going to be very annoying. I'd suggest using 1/4" or 3/8", because you don't need to buy as big of a tap, tap a bigger hole, drill a bigger hole, get the right drill bit for a bigger hole, and all at the same time, be very careful tapping the hole itself. A hybrid is not something you want to mess up on.

One spark gap is fine, and a schrader valve spark plug is very easy to make, and is also NPT threaded. I'd advise (using SpudBlaster's advice) putting the spark gap about 2/5s of the way from the back of the gun.
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Unread postAuthor: SpudBlaster15 » Tue Sep 25, 2007 1:25 am

1) Paintball tanks are most likely made of aluminum, as decent grades of aluminum have sufficient fatigue strength to survive the high pressures contained within the tank, and aluminum alloys are very lightweight in comparison to steel alloys.

2) Depends on the thickness of the tank. If the tank is thick enough to allow at least 3 threads to be cut into it's ends, then taping is probably the easier (and less permanent) solution. A silver soldered joint would be plenty strong should the tank lack sufficient wall thickness for taping.

3) 2 spark plugs (assuming they are threaded into a conductive chamber) can be wired in series by simply connecting each of the igniter's leads to the top of each plug. The chamber will complete the circuit. However, as noname said, you do not need multiple spark gaps in such a small chamber. In a single gap setup, one lead would be connected to the top of the spark plug, and the other to either the metal body of the plug, or somewhere on the chamber.
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Unread postAuthor: octane89 » Wed Nov 28, 2007 3:19 pm

About 99% of CO2 tanks in paintball are steel. Iver never seen a aluminium one. The only different ones are HPA tanks, which are fiber wrapped and made from composites. A 20oz co2 tanks will run about $18-$25 (at least in the US), but the hpa tanks are $150-300 for a fiber/composite one, and there are steel verisons of hpa tanks too running about $60 for a 48ci/3000 tank.
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Unread postAuthor: SpudFarm » Sun Dec 09, 2007 4:56 pm

there i no problem to find out if it is steel or alu. just take a angel grinder (or something that makse sparks) and grind a bit where you are going to drill a hole if you get sparks its steel and if not its alu!
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