Um, I've looked around at the hybrid forums, but I still don't know what a hybrid gun is. Is it just fuel and air put in the chamber under pressure and then ignited?

Ouch, even steel? Doesn't Aluminum stretch a little bit? Then maybe it could take the spike? What if I use SCH 80 steel? SCH 80 aluminium? Also, do i need two meters, one for propane, one for O2, or can i find some sort of T fitting that will allow me to connect two bottles? The diemensions i want t...

I'm new here, not sure what all the acronyms are such as DDT, or PDE.

Also, I'm planning on a 4 inch diamter chamber and a 2 inch diamater barrel. Weight and cost are also a concern, It's metal, but i want to be able to move it, and steel is heavy, what about aluminium.

Haha metal it is then. By meter do you mean the kind shown in that video on the top of the combustion page? Is there a better way to get the right mixture?

So I made a potato gun out of just PVC and a regular propane torch that supposedly makes the right mixture all on it's own. Well, that one made around 600 feet, but I'm trying for better. The atmosphere is only around 18% oxygen. I want to use propane, and pure oxygen. I believe the right mixture is...