Update: Made a gun of the same dimensions, but a piston valve. Ball Valve fires about 5-10 meters more every time at same psi.

spudtyrant: Should have mentioned, I put some Vaseline on the ball valve, I thought it was a given. I also think a larger valve would be less prone to leaks then the smaller, because the potato portion can be longer as well, causing a sort of natural gasket. The potato I used reached all the way fro...

Was it a slow leak? Or something more serious?
Get Well Soon

Mateo:
Did you do it? Results?

I wonder how big you could get till potato-destruction.

spud downunder:
What size pipe are you using?

Might have a different result then my 2"

What size pipe is that?

@mateo
Suggestion: you should film yourself firing it before the barrel is attached, and while slowly turning the knob. Would be interesting to say at which point to slips out.

I'm not sure how I would document the fact that its actually going into the valve, my barrel is not threaded so i cant take it off and film the potato actually going into the ball valve. I tried putting the camera in the barrel to film but no matter how i positioned the flashlight i could not get a ...

Did you release the ball valve slowly? Thats how I confirmed that mine worked.

I will try to get a video up as soon as I can.

Not the butterfly or shuttle, like i said in my last post, the potato was just in the valve. Nothing else.

Haw-Haw
Just finished it, yesterday. Shot it today (100psi) with a potato in the valve and there was no mush! I even tried it again but turned the valve really slowly, and still, a perfect shot! No extra parts, no extra costs.

[/code]it would take you dramatically more time and money.
[/quote]

What part of a ball valve, some string and a can (or other piston-like object) would cost more then a piston valve?