I am currently in the process of building a super powered torsion catapult, with 100 ft of 3/16ths steel cable, this is just a dry run I am trying now, if any body has any input it would be helpful. Yea here's suggestion #1....Be more accurite in your titles or get your post deleted, suggestion #2, ...

Nice, as soon as I'm not working 7 fucking days a week I'll finish my forge and work on making it

Has anybody thought about making a piston out of molten aluminum?

Just a quick question here, how did you take care of the little weld nub on the inside of that 2" 3inch galv steel pipe that your piston moves along?

I like your piston valve I'm wondering g if I can copy your piston design? That's the one thing I have on my hybrid to take care of.

That has to be the sexiest thing I have seen to day. I feel like I would get my self in trouble with that.

So I am considering my pitons design, and I'm thinking1 what parts do you guys use to put your pitons together? My other question is about the the piston exhaust I've been looking into that part of it and I just can't figure it out. I was considering buying a piece of 2 inch solid steel that's 4 may...

Not if they are cut and frozen with liquid nitrogen....... Then they will be indestructable!!!!

I didn't even know there was such a thing haha. I plan on using 3 different bArells depending on how far I'm trying to shoot I'm thinking 5 a 10 and a15 foot barrel, I am extremely curious to see how far one of these things will throw a potato cuz the last combustion I built could hit 1400 feet regu...

My best with a potato is 1400 feet. Using google earth

Well according to engineer toolbox I don't have a damn thing to worry about, if I keep it under 4000 psi.

I plan on taking it to 15 maybe 20x but I think it be a very good idea of preasure testing before those levels.

My other question is what is the best way to preasure test this thing, my idea was to take one of each part that's in my gun connect them all together then, pump it full of hydronic fluid till it breaks. How do you guys do it?

I'm thinking about putting a spark strip in each chamber, I just haven't figured out how to cone t the wires and still have it be air tight. Any ideas? I looked into that universal spark strip but my only concern is weather the curent will pass through the bolts or just electrify the whole damn and ...

http://imagizer.imageshack.us/v2/150x100q90/c/843/0t77.jpg This is what I have so far, it's all 2 inch galv steel pipe. The 2 long pieces on the sides are the chamber wich is 226 cubic inches not including all the misc atachments. Now I just have to get the piston made for the piston valve and the ...