SpudFiles

ok well i am going to make a watergun of pvc and run it off a hpa tank. mainly making this to take it to the beach and shoot people. the pressure at which i run it at will be determined when i find out how far it shoots when i make it. heres a pic i drew up.. sorry for the crappyness but im about to go off and wanted to post this so it can get view before i get back..

main reason im posting this is to find out any suggestions you guys might have or anything.

its not upside down... water sinks air rises....

Hold on tight, because it'll kick like a Shaolin monk!

Just make sure that you have a big resevoir, and a small nozzle so that the HPA tank can replentish the resevoir quickly enough. Use a ball valve instead of the check valve. Ball valves are cheaper, and unless that check valve has an insanely low opening pressure, the water won't push it open, and you obviously can't use a swing check valve upside down.

@ DYI

The first time that I saw your user name, I thought: "Do Yourself It? WTF!?" I loled. What does it stand for, if anything?

yea well its 2 inch reservoir so i think 2 inches by a foot long will be good with a 2-3 inch piece of half inch and the end cap should be easy enough to fill. <a href="http://www.spudfiles.com/forums/viewtop ... ml#112356/"> my golf ball gun</a> takes about 5 secs to fill to 100 psi from the hpa tank..

also i actually planed on pushing the check valve open with my finger to let the reservoir fill up a ball valve would be more expensive

Gee, where I live, your average run of the mill check valve costs about $25.

DYI stands for Do Yourself In (among other things), and is obviously a play on the phrase Do It Yourself, as people always think that I am going to blow myself up with my homemade launchers (this opinion was caused by the fact that the Oxy-MAPP hybrid incident left very noticeable scarring). My safety record has been perfect since then, but the damage has already been done.

oh well here from what i remember there about 8 bucks. ill check it out again tomorrow at lowes tho to be sure

I have a suggestion (and given I am a moderator on two watergun forums, it might be worth listening to).

What you should do is a piston style cannon like this. Basically, you have a long pipe divided into two chambers by a piston (With O-rings of course), where one of these is full of water with a ball valve as a trigger (Unlike in the spudding world, the ball valve is the best valve in the watergun world because of it's clean flow), and the other chamber is full of your pressurized air.

You should only need a ball valve, quick disconnect, and a length of dowel to push the piston back down again. Filling is done via the ball valve nozzle.

Gets huge range and output. It won't be particularly easy to make the piston, but it is simply the best way of doing a watergun of this variety.

i can see how this works and it would be pretty awesome. there should be a section on here for water guns.

Or get one of these and throw one line into a body of water and point the other line at someone else. Make sure you attach a really small nozzle to it.