Thanks everyone for the replies!

Could you tell us a bit about what you want to achieve with the project? Maximum performance, repeatability in terms of accuracy or range, semi-automatic fire?

I would prioritize power, repeatability, and accuracy. I really like the idea of being able to hit a ...

Hi,

Alright first post here.

If this post is not right place I apologize. So I am planning on building a cannon for a physics final project utilizing a 2.5" Mecair VEM220 Dust Collector diaphragm valve and a 2.5" barrel for tennis balls.

I found the Mecair valve after many hours of searching ...