I would look into modifying sprinkler valves, and then use a 1' or 2' x 1" chamber up to around 130 or 140 psi, and a 3/4" barrel a little bit longer than the planned rocket.

Huh, so a really long and narrow chamber, rather than the fat ones others use?

Are you envisioning something like 120yds ...

You could easily make a much better version of that. That might go 1000 feet, but my experience with anything like that is that they never last for any reasonable amount of time.

Ah, thought it'd be too easy.

Could I just build something like this, but with a really narrow barrel to go up in the ...

You know, that "Airburst" toy is only $21; for something that supposedly shoots 1000' that seems pretty reasonable. I'm almost tempted to buy it, scrap the vertical stand and rig up and angle-shoot bipod and baseplate, and see what it does.

The downside is that the closest/easiest place to shoot it ...

I made a 3' long (inert) missle which slid over a 3/4" barrel & got some amazing range with it.

edit- link- http://www.spudfiles.com/forums/3-4-cardboard-sleeve-missle-t15425.html

(this was it in it's most basic form)

Amazing range? How amazing are we talking here? Now I'm curious!


That toy ...

Greetings, I'm not experienced in the spud-cannon scene, but used to be a professional artilleryman (11th Marine Regiment), and always though the idea of spud-cannons to be pretty awesome.

I've been messing around a bit with rifle-grenades (inert) launched off my AR-15. Then I did a bit of reading ...