I do modeling in Blender, I might be willing to help out sometime. Check this thread for an example model. I got the dimensions from a caliper and ruler rather than a website. (Except for the pipe ID.)

Bump to follow through on my promise of a spud gun model. I haven't bothered to model the threads in the clean-out adapter and cap yet, and there's no igniter, but you get the picture. :wink: http://uploader.polorix.net//files/19/gun1_thumb.jpg http://uploader.polorix.net//files/19/gun_exploded_thum...

So anything over a 1:1 ratio is just wasting fuel? I remember people at Spudtech used to recommend 1.5:1 a lot, even though the BurntLatke tests said 0.8:1. (My old name was Lord of the Rings Junkie...)

I have to third Blender, I've been using it for about a year now, and a spud cannon should be a pretty simple thing to make. (In fact, Blender pulled me away from the old Spudtech forums for a long time...) Perhaps I'll throw together a basic combustion gun later and post a nice render from Yafray. ...