Tait, you forced me to sign in. Why?
First off, 80 psi against a film canister filled with sand, in my experience, has enough energy behind it to easily take out a squirrel. Its energy at 100ft. is more than a .22 long's. I think I will make a video especially for you so as to show you the shear power of a cannon with 3 gallons of air behind the projectile. It is incredible. I once used a PVC rocket to accidentally take down a tree branch. The branch was only an inch or two in diameter, mind you, but still...
Hey CS, in my opinion your first design is far superior. I dunno why, but it probably is my inability to conceive how that latest one works.
I'm also going to modify that first one to try and solve some of the problems you described. I'll post what I get as results probably after Wednesday, since that's when my new barrel comes in
![:D](http://nerfhaven.com/forums/public/style_emoticons/default/ph34r.gif)
. I think I might have to make a breach for it...mmm...steel...the Yoda of building materials...
Well, the sun's setting over here, so I can't really do much else today. That vid will be taken hopefully tomorrow. If not, expect the thing CS is designing to have a vid on Thursday.
Again, remember that these cannon are capable of massive power. I mean, with the right valve, a 20oz soda bottle full of water can easily be sent through 3/4" plywood at a hundred feet.
Ha, I need to get sound of my cannon firing that casing I made at 80psi. It's so much louder than anything else I've fired due to the seal the plastic bag makes....