So yeah I'm making a spudgun. I'm not entirely sure what the hell I'm doing, and I'm probably doing this in a pretty terrible fashion, but I don't care, because at the end of the day, I'm pretty sure I'll be able to launch potatoes with it.
Anyways. So I went shopping today, and I picked up the supplies. Here's the hardware, minus the ignition system:
The top two bits are 2' of SCH40 ABS plastic; one is 3" ID, the other is 1.5" ID.
From left to right in the bottom row:
1.5" male cleanout cap (which is threaded, which I'll get to in a minute)
3" cap
3" hub w/ 45 degree 1.5" branch. This is gonna be the majority of the ignition chamber.
3" to 1.5" flush bushing. This takes 3" ABS and narrows it down to 1.5" with a nice neat angular piece. Looks a lot like the exhaust nozzle on a rocket, which is just ideal as all hell.
1.5" female threaded cleanout plug.
So the basic design goes something like this:
Everything is fixed in place with ABS cement EXCEPT the threaded cleanout cap. You unscrew that, spray in the fuel, and then rapidly seal it. The 3" endcap is totally sealed in, the electrical elements (I'm homebuilding a sort of electrical-arc generator to ignite it). The end of the 1.5" ABS (the muzzle end) is gonna get ground down to a sort-of edge, so that you load it by just pushing a potato on, and then ramming the core far enough in to be properly launched.
Assembly is planned for tomorrow, so expect more (probably better quality) pictures.
Oh, and the total cost so far is about $44, and that shouldn't change. Except for the ammunition, of course.
