5 replies to this topic

[davidbowie]

This isn't terribly practical, but it is a lot of fun to shoot, and it's a good way to get a lot of power out of a CO2 bike tire inflator for little money. The real reason I made it was to prove that it can be done safely and cheaply, and hopefully cut down on the amount of threads in the NIC dedicated to CO2 bike tire inflators. Plus, I had the cannon laying around from a different project.

The gun consists of a 12"X1/2" PVC nipple, capped at one end, with a schrader in the cap, and a 1/2" union on the other end. Part of a 24"X1/2" PVC nipple is screwed into the other side of the union. That's it. A burst disk is inserted into the union, and a mega stefan put in the barrel. I usually use parts of a plastic shopping bag or trash bag for burst disks, with between 2 and 4 layers depending on power needs. Using 2-layer disks, I can get up to 10 shots out of a cartridge, each going at least 110'.

[Flaming Hilt]

What wait hold on a sec just slow down.

What is this plastic bag madness you're talking about? And... and... ten-shot bursts?

Are you using plastic bags as shells? Because that's a REALLY good idea.

[davidbowie]

I put a few layers of plastic bag over the male part of the union, then screw it together. When I start to put pressure into the chamber, it builds up until the bag bursts and the whole chamber is dumped into the barrel very quickly.

[The Inventor Guy]

davidbowie, on Jun 26 2006, 03:01 AM, said:

I put a few layers of plastic bag over the male part of the union, then screw it together. When I start to put pressure into the chamber, it builds up until the bag bursts and the whole chamber is dumped into the barrel very quickly.

I had a similar idea once, but using Coke bottles and using the little blue sealing disk as the burst disk.
I think that could work. The burst disk idea that I gad wasn't for a homemade nerf gun, but for an air tank.

I like your idea of using PLASTIC BAGS. Very good and recyclable. Just don't lose the bits in the yard - think about the children! ...or birds...

-Tidge.

Edited by The Inventor Guy, 27 June 2006 - 12:54 AM.

[badger]

davidbowie, on Jun 24 2006, 09:07 PM, said:

The gun consists of a 12"X1/2" PVC nipple, capped at one end, with a schrader in the cap, and a 1/2" union on the other end.

What's a schrader?

[CaptainSlug]

A schrader valve is the kind of valve you find on a bike innertube or car tire.
http://en.wikipedia..../Schrader_valve

And no he's not talking about 10-shot bursts. He was explaining that one co2 cartridge will give this gun design 10 usable shots before the cartridge needs to be replaced/refilled.

Edited by CaptainSlug, 26 June 2006 - 06:36 AM.