SpudFiles

I'm going to make a really frickin small hybrid. Just a 3/4" or 1/2" SCH 80 nipple, a galvanized reducer to 1/8" Schrader, and a 1/2" or 3/4" union with a BB barrel on the other end. Probably just a BBQ igniter for the ignition.

Good luck.
So your filling the propane and air from the shrader?

Yep. Might be able to break 4x or maybe 5x. Small Sch 80 pipe can hold A LOT of pressure, and steel is just not going to blow up no matter what you do to it.

Good luck getting the correct mix. Small chamber like that are a bitch to fuel.

The propane meter is prbably going to be a nipple between a blowgun and a tire chuck.

that is gonna be a lot of propane like 2x or 3x

How do you intend to pass the BBQ sparker wires into the chamber? The chamber conducts, so you can't use screws or something like that...

I'm working on a large-scale metal hybrid. For my ignition system, I pass the wires into the chamber through a quarter-inch bushing, with the space around the wires filled with JBweld. I use well-insulated wires connecting to a spark strip. You could build a mini spark strip and do something similar. Just put a T on the back with the schrader on one end and the ignition wires coming in the other.

By the way, with hybrids, smaller spark gaps work better. I'm talking teeny, 1/32" or so. A BBQ sparker might not be the best for this. Consider a camera flash (easy to build).

Peace,
Pete Zaria.

There is going to be like 3/8" of exposed sch 80 in which I'll put two little screws like on <a href="http://home.comcast.net/~irwinner/potato.html"> this gun.</a>

Exposed sch 80 what? PVC or metal? You can't put screws for an ignition system through metal; the metal chamber will conduct (shorting the circuit) and you won't get a spark. If you're going to have exposed PVC that's taking pressure, then that will be the weak point of the gun...

Peace,
Pete Zaria.

I think he meens PVC. This is gonna be cool.

My mistake, guys. I confused this with another thread and thought he was making the chamber out of metal. My apologies for the confusion.

Peace,
Pete Zaria.

Well im not sure, you may be right. Well i guess we will have to wait for him to reply.

What do you use to cement metal to pvc? That is why i changed my plans on the chambers i'm useing. A clue on this would be really cool.

I think that you have to tread them together. Thats how people attach ball valves to simple pnuematics. I would also when treading it i would put epoxy on it.

It's going to be a Sch 80 PVC nipple that's threaded on both ends. And thanks Professor, I might put JB Weld or something on the threads and screw them together fast or hook them up to a drill to spin them together before the epoxy dries.