Specs:
chamber- 4" by 6'
barrel- 2" by 5' (9 feet with extension)
piston- 3" cap with washer on top
pilot- modified 1" sprinkler valve
operating pressure- between 50 and 70 psi usually
length- 8' (12' with extended barrel)
The barrel disconnects at the two inch union at the front of the chamber.
At 60 psi it shoots a mini nerf around 1/4 mile, a full tube of caulk 150 yards, and a bouncy ball 3/8 mile, through 2 sheets of 1/2 inch osb, or up into a blue sky until it disappears.
We estimate it shoots a bouncy ball between 500 and 700 fps.
I need to get my dads chronograph out to see how fast it really shoots.
I am now working on a stand for it and will have pics up soon.
Damage pics and video are coming.
PS: i don't have a name for it yet, any suggestions?
EDIT:
This is a video of shooting a full milk jug. My dad is shooting so that i can record it. The first part is shooting it, the second shows the milk jug, and the third shows the 2" ball sized piece that it cut out of the milk jug. Notice how it got the whole backstop wet.
![Very Happy :D](./images/smilies/icon_e_biggrin.png)
[youtube][/youtube]
Edit: I finally got pics of the stand up. I know the size in kinda over kill but i don't want it to fall over. It has a full range of motion so i can shoot straight up if i want to. The stand comes apart so it's easier to store. both pics are without the extended barrel.