Looks great! What kind of pressure are you going to run in it?

If memory serves me right I think C or D batteries would fit? Also some make up some cement slugs, relatively easy to do.

So then whats the final decision??

I vote keep the power category and add the third place to innovative

So then were do we submit the entries?

Finally got the kick in the a$$ to start the new cannon!

I am goin to put dual valves on there when I have some money, trying to find a job right now. Actually even with the sprinkler valves I am able to shoot a section of 2.5" PVC filled with concrete through about 3" of plywood so I can only imagine what the new valves will do. I have them drawn up and ...

Yea I do know how to make them all but just didn't have the money right now. And yes there is a lot of pressure on the connection were the 1" goes to the chamber, that is why I have the barrel taped down like that to relieve the pressure on the joint. I got the pipe from my job this summer, the plum...

Ya there not enough but for what I had they work till I make another 4"er valve.

Thanks

This is the more expensive idea but photo paper works well, mind you the cost tho. But when I used it for 2-3x mixes it held up well.

The ONLY things that I would ever use DWV in a air cannon would be couplings and reducer bushings. When you do this you layer over things and it will hold up, but that is only if it is a last ditch effort.

Here are the specs-

At ours we dug a bunch of trenches that run both sides of the field. They are around 3-4' deep. We also made bunkers that are in the ground, there is also a mine shaft sort of thing. Just go out there with a shovel and start.

A Hollywood makeup place, so I look like one and not worry about them attacking me.

But if I had to pick, Mcmasters, because there is one 5 mins away from me.

First, concrete can get caught in the barrel when you shoot it, scraping it which could weaken the barrel over time and lose air pressure because things don't have a perfect seal and it could lodge itself in there, I know from experience. So your best bet is to make a sabot. Cast a section of concre...