Parts arrived today and it's been assembled and tested.
Tennis ball shot out pretty reasonable at 50psi, not great but a big improvement. A soda can works very well and when shot vertically it went at least 10m.
Heading down to the park later for some proper testing so will get better results then.

Thanks for all the tips guys! Il go ahead and purchase the parts for the mod and hopefully that'll do the trick! Il you keep you posted with my results! Cheers

Okay thanks I will look at modifying the valve. Hopefully that solves the problem! And to the other question, the pipe and valve is rated at at 150psi. When testing I had put in 60psi and the tennis ball simply fell out the end and went a metre or two. And Using 24v dc which seems to operate the sol...

He there new to this forum I am a newbie to pneumatic air cannons and so have just built my first one, which unfortunately isn't working. It uses a 2" chamber and 2 1/2 barrel connected to a 'U' shaped 1" rain bird ASV 100 valve. When I activated the solenoid I get more of a 'horn' type noise rather...