That is the exact design I have been looking for.
does anyone know what valve they had on it?

Ok, so far I am looking at having a 5' long 3" PVC barrel and a 5' long 4" galvanized Steel chamber. What kind of power and range should I expect out of that?

How high of pressures? Would an average air compressor be fine?

Ya, that was around the size I am going to make mine. Except, is that big of a chamber needed for a cannon that big?

Thank you, that cleared it up.

I am having a little trouble understanding the concept of a piston valve. Are there any tutorials for a larger valve, near my size of cannon?

I will look into using a piston valve. Is there some sort of formula for determining distance for air cannons? Also, it doesn't have to be 500 yards, I would even be fine with 250-300 yards.

Thanks for the quick reply, so what would you suggest for the valve?
Or what do you think the estimated range would be with my planned ball valve configuration?

I am needing some help designing an air cannon. It will have dual air tanks with a diameter of 4". The barrel will be 3". The length I was planning on having is 5 feet for the barrel and 3 feet for the tanks. I need it to be able to launch a baseball between 350 and 500 yards. Also, would I be able ...