Well first of all it would be launched from a pneumatic gun. The whole idea is that instead of wasting a lot of energy moving the rocket from 0-45mph or so, the engine kicks in then and further accelerates the rocket. This could get it going fairly quickly. I was thinking the same thing for an accel...

1. Use a qev, they are better than sprinkler valves (I just got a qev and it easily beats my old sprinkler) 2. Silencers will cut down on the noise, but you have to build it right. There are more than enough online resources to figure it out. 3. Plastic welds can be used to make a stock or accessori...

If you want to do co2 safely use an anti-siphon tank. They are specifically designed to keep liquid from coming out. (ask the paintball store about an anti-siphon. Also someone recently found a co2 regulator that is meant to run air tools, it stops at 120psi and you can choose anywhere from 0-120 by...

Has anyone sucessfully launched a rocket out of a spud gun, then had it ignite/take off in mid air? I think I could wire up a photoresistor to an ignitor circuit so when the rocket leaves the barrel it would launch itself. Another idea was to use an accelerometer/mercury switch but the first is to e...

If you had a rifled barrel you could use a centrifugal clutch to hold the parachute in the back. (google it) Also I had some nice preliminary results packing the parachute in real tight and attaching a streamer to the end of it. The streamer eventually pulls the chute out, kind of like a drouge chut...

Most paintballs fail because of the bolt hitting the ball too hard, not because of the pressure exerted on them. Also if you are firing faster than the ball can enter the chamber the ball will get cut in half by the bolt, this is known as "chopping balls."

Here are the mods I propose:

You could have a repair coupling behind the break with a spring behind it. The hinge that the barrel is attached to could also have a spring to open it when the repair coupling is pulled back.


One sec and I'll make a diagram...

If you are going to use paintball gear go with HPA/co2 like spudzinger said (you only need one, and there are belts designed to hold it behind your back). I would go with 2x 3" pipes, they will hold alot more then the same length of 2" pipe, but are easier to find fittings for and are more compact t...

I'll get some calipers and figure out what size I need. Thanks Killjoy and redneck, I didn't know they carried O-rings but what don't they have?

You can get normal paintball tanks filled for $5, I think Dicks will do it now since they are selling more paintball supplies.

I have a sheet of neoprine, but it will be extremely tough to get it perfectly round.

If someone knows where i can get large O-Rings, PLEASE tell me!

Yes a dremmel with a sanding drum would work.

McMaster ships from Buffalo NY (one of their distribution plants is there) and I'm like a 1hr drive away. So while it still costs a bit for shipping, stuff arrives almost next day.

It has 2 large O-Rings, the bolts keep the back from coming out.

The piston is light considering it is 3" in diameter, and yes obviously air is leaking around the piston, but what can I use to seal it? I'm going to try some duct tape once my roommate gets home (unscrewing it is a 2 person job.)

Anyone know where I can get 3" O-rings?