water flow

[robnix]

The current issue of Make magazine has detailed instructions on how to do this.

[Pneumagger]

If you want to jack up your velocity without raising your pressure, then you should drop the size of the tube, not raise it. Try using the multiple smaller tubes as mentioned, not just to reduce turbulence, but you will turn one slower stream into a group of faster streams. Try to reduce as many transitions as you can, and if possible, use a tapered reducer instead of a flat transition piece

when you use many small internal tubes, the velocity change from the single bore tube to the multiple bore tube is neglible. The most efficient way to size reduce your tube with the least loss is a parabolic reduction. But a conical reduction should work fine if its fairly gentle also. Be sure to put the interior tubes AFTER the reduction and not to use a flat, bushing type reduction.

edit, if you are indeed going to use a more viscous fluid, then the tube thing will KILL you flow. Basically the shear forces in the fluid will not allow it to be fast enough without adding even more pressure.

[omegaredghost]

ok so far what i have is a 3/4 inch peice of pvc with eight 1/8 id poly tubing but only seaven tubs are used as the center one was used to distrubuit the expanding foam eveanly threw out the rest of the tubes and out the holes drilled in the pvc shell as well as sealing up any holes that water mix is not supost to go threw. should hold the surge of water i hope . the expanding foam is the only thing that i could find that would stick to that poly tubing. i have been playing with the idea of making the inlet end of the tubes concaved. dont know if it would help or hurt also just so you know i did some flow figuring with a dummy chart and as it turns out seaven 1/8 id tubes flow is almost as much as one 3/8 id pipe a little bigger than i hoped for but will just have to see how it works. i still dont think were all on the same page on the reason why im wanting to use such big hose. i have to use big line to keep flow higher to the point were it goes threw the ballcock valve and out the tip so as to give it some grunt. also though you would like to know that the guy in the photo is useing a real flamethroewer that has 3000psi behind it and a 1inch hydrlic hose and a thick mix of paint and he can only shoot 120 ft with it so if i get to 80ft i will be extremly happy . i love the chat keep it coming i dont know why i like technical crap like this maby i missed my calling

[Pneumagger]

whatever inner tubes you use make sure they are thin. This is a big deal. If they are thick, it hurts you.

[Sumthinwicked]

saw a guy use a real flamethrower he modified with the origional propellant to paintball he used grenade fill just an fyi according to him gl with this you have to go to stalingrad at skirmish and play for the russians with this

[rkjunior303]

lol i cant imagine being hosed down with something like this at a game.. i'd be pissed!

[omegaredghost]

well so far this is what i have done i tryed the multy tub set up it shot lots of volume and very stream line form it just did not shoot over 30ft not so good then i used a cone shaped tip 50ft was what i got out of that so it the same as the 1/4 inch pipe that i started out with. then just on a hunch i moved the valve from the tip of the hose to the exit of the tank then through the hose and i go 60 ft. then after puting a psi gauge in the tank i found out that my pressure was droping from 140psi to 60psi upon opening the valve the line from the co2 tank just cannot keep up with the volume drop in the tank. 1/8 inch line going in 1inch line comeing out. so im thinking that if i keep my volume of air pressure going in at least equal to what is going out i should see a better effect on distance that it is throwen. please give me some feed back