Hey guys. Been planning on making another spud gun, but I wanted to use CAD software to plan it. does anyone use this particular software? I've been experimenting with it and I'm really starting to like it. Are there any other recommendations for easier software other than Google sketch up?

Well, I figured out why it ain't shooting like it should be. I put a bigger 4 foot air tank on it along with a bigger barrel, and I wrapped the piston in tape to get a tighter seal, and It did perform better, but then I remembered it was shooting better with the first piston I made. ( I tried ...

No, I'm not stuck like that. Only in Texas am I stuc kin a battle field XD

Actually, I'm here because I've got many beloved relatives either with cancer or on hospice

I wish I could work on it, but I'm stuck in Omaha for the moment

How light should the piston be? It's not heavier than a wooden piston of the same size.

The piston isn't very heavy, and it travels about an inch. Like jackssmirkingrevenge said, I've already done mah math.


The piston has a far from airtight fit, and when I exhaust the pilot volume, there is quite a gust of air coming out of the sprinkler valve.

Hmm. I'l have to try that.

Anyways here's a very rough drawing of the gun. I used the design Klugeboy demonstrated in one of his videos on youtube. It's in part 2 of his piston valve videos.

on the diagram I have a 1 inch slip - thread adapter at the end of the 1 inch pipe so I can screw on ...

It's a pretty good fit. Probably not the best, but it's pretty good. I'll try to make a diagram of it ASAP

I recently built a 2 inch piston valve with 1 inch porting. The tank is screwed on via a 1 inch slip to thread adapter. I use a 1 inch srinkler valve as a pilot valve (This one's an Orbit Watermaster). I used a 1 1/4 inch coupler as the piston and filled it with epoxy. When I fill the gun with air ...

Guys thanks so much for your help! I built a working piston valve! :D I used spare parts from mah other cannon for most of the parts, and tested it at around 75 psi. I can't really estimate what kind of performance it has, because It's really dark out, and I didn't have proper spuds. I'm going out ...

Why would someone attack a Spud gun forum? That's just dangerous.

Thanks for the input guys

I have but one more question: what would be a good material to make the piston out of? I was thinking either a 1 1/4 inch coupler or a piece of molded hot glue.

Which rule would you recommend for a noob like myself?

Hello all, I'm new to the forums. Some might recognize me from the benheck forums.

Anyways, my attempts at building a piston valve failed, but I'm willing to try again. I don't give up easily. I was wondering, how far does the piston need to move back in order for good airflow? I've heard from ...