Ya I am thinking of using mini nerf footballs with the tail fins to be what I launch, but if I want ones that have a whistle in them that are small I have to get them from the UK. Any ideas on how to make a mini foot ball whistle loud enough to hear from 10ft away or so?
However you make the aerial ...

I am thinking of using a Stem Valve. How do you get it in place? Is there one you can buy that will tread in? The one I got off a old bicycle will not stay put because it can't tread in.

Hmmm.. Things to think about. Thanks

Whats a "shrader"?

I want it to explode as soon as it hits something, not in the air.
And Thanks for the help
Well a trigger activated pneumatic mortar is not a problem, that can be built in a variety of ways. I suggest looking through the pnuematic cannon showcase here on the forum. Coaxial would probably be the ...

Okay thanks, and how might i find step by step instructions on how to build one?

HaiThar wrote:I dont know about working with CO2, you'll have to ask one of the better people around here... but what you'll want to make is maybe a piston over and under with a modded sprinkler valve...

I would like it to be fired by a trigger like thing. I will have this on my shoulder or under arm most likely. And I did say I want it powered by either co2 or a bicycle pump.

I am sorry if this is not the place to post this. I am a noob about this stuff, I am a airsofter and I want a cannon that will launch a mortar like object that will explode with bb's at a pressure that won't kill or anything :) I need it either co2 or I have seen some powered with a bicycle pump. I ...