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Hybrid I think.

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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Hybrid I think.

Unread postAuthor: jjjd » Thu Mar 20, 2008 2:19 pm

Hey guys, I have always wanted to build a small but strong portable hybrid, so My idea was to make it like Fnord's Hybrid and use a vertical piston so make it faster and easier to use. So I will be making it with Sch 80 steel, and probably a 2" main chamber, and a marble barrel. because I wanted it to be portable I was thinking if there is a way to create the same effect somewhat but just use oxy-propane and just have an oxygen cannister as well as a propane. Im quite confident this is safe in small proportions I am just not sure exactly what small is.

Thanks, Andrew
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Unread postAuthor: Fnord » Thu Mar 20, 2008 2:26 pm

Unless you have a lathe or milling machine, the type of piston I used on the first version will be a pain to construct in a way which won't be damaged. A barrel sealing piston will be much more reliable. In fact, I haven't really had any trouble with the second version after over a hundred shots, other than what resulted from not knowing what I was doing (no bumper=cracks).

If you're only going to be firing marbles you can use a much smaller chamber.

Apparently oxygen is too expensive for the benefits it gives. I think SB15 has used it, so you'll want to talk to him.

Edit: I just had a good idea;
If you want to try a spring-based piston, you should probably try using a plunger from a bicycle pump (preferably a non-floating oring one). I bet that would work and also not be a pain to machine.
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Unread postAuthor: jjjd » Thu Mar 20, 2008 2:33 pm

I don't full understand the concept of your second gun, Sorry.
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Unread postAuthor: Fnord » Thu Mar 20, 2008 6:51 pm

It works the same as any barrel sealing pneumatic works, only instead of lowering the pressure behind the piston by venting a pilot volume, you raise the pressure in front of the piston by igniting the mix.
Both methods will open the valve.

You can theoretically use any barrel sealing pneumatic as a hybrid by adding a spark gap, but only guns made from strong, non-brittle metals will survive hybrid mixes safely.
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Last edited by Fnord on Thu Mar 20, 2008 7:17 pm, edited 1 time in total.
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Unread postAuthor: SpudFarm » Thu Mar 20, 2008 6:55 pm

_Fnord! don't forget the copper and aluminium..
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Unread postAuthor: Fnord » Thu Mar 20, 2008 7:16 pm

Oops. brainfart.

Not many people make hybrids from copper/aluminum so it probably wouldn't apply to him anyway. I'll edit it though.
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Unread postAuthor: jjjd » Thu Mar 20, 2008 11:35 pm

Okay, well the way I understand the piston is off the chamber instead? Im sorry but that is all I get, I have no idea as to how a regular piston would move back from more pressure in the chamber.
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