help with aph design

Build a homemade water gun or water balloon launcher and tell us about it.
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JF2015
Posts: 35
Joined: Wed Jun 16, 2010 3:32 am

help with aph design

Post by JF2015 » Sat Jun 26, 2010 11:27 pm

i am going to build an aph and i am unsure of which size pvc pipe to use. please help!
if you get soaked, look UP first

my (rather small) arsenal: max d 6000, arctic blast,ww shark, aph (in progress)

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martianshark
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Joined: Mon Jul 06, 2009 10:24 pm

Re: help with aph design

Post by martianshark » Sat Jun 26, 2010 11:45 pm

If you want it to be cheap and a little less powerful, use 1/2". If you want a large one like Ben's APH, use 3/4". If you want it to be rediculously small (and if you can find it) use 1/4".

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Killi101
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Re: help with aph design

Post by Killi101 » Sun Jun 27, 2010 1:35 pm

Go through the APH guide and decide for your self:

bigger pipe: more flow, more bulky, generaly more grip.
smaller pipe: more pressure, lighter, less grip (unless you make one).

it depends on what your looking for.
Water:
dont like drinking much
like to throw it at people

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JF2015
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Joined: Wed Jun 16, 2010 3:32 am

Re: help with aph design

Post by JF2015 » Sun Jun 27, 2010 2:09 pm

if i used 1/2 inch pvc pipe would the check valves, ball valve, and joints need to have a larger inner diameter
if you get soaked, look UP first

my (rather small) arsenal: max d 6000, arctic blast,ww shark, aph (in progress)

Fredcompany
Posts: 198
Joined: Thu May 13, 2010 7:09 pm

Re: help with aph design

Post by Fredcompany » Sun Jun 27, 2010 4:34 pm

Depends if you can get 1/2 inch PVC fittings where you live.
If you can't find any, use a reducer on either side of a larger fitting
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cantab
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Re: help with aph design

Post by cantab » Sun Jun 27, 2010 4:38 pm

For affecting performance, you only care about what's between the pressure chamber and the nozzle. So the piping and joints linking the two, and the firing valve. The check valves are not part of that path, so they can be smaller.

You also want to pick the right pump diameter . Too big limits the pressures you can reach badly - maximum pressure scales as inverse square to pump diameter. Too small means you have to pump a lot more - number of pumps to fill the PCs to the same level scales with the same inverse square.

For the rest of the gun, you probably want to use small pipe to reduce size, and definitely try to go for small check valves. (Brass check valves are I believe much smaller than PVC ones, but you'd need adapters as well which might remove the advantage.
I work on Windows. My toolbox is Linux.
Arsenal:
Super Soaker: XP215, 2xXP220, Liquidator, Aquashock Secret Strike M(odded), Arctic Blast M, CPS1200, CPS2100, SC Power Pak, 3l aquapack, 1.5l aquapack
Water Warriors: Jet, Sting Ray M, Shark, Argon M, Tiger Shark, PulseMaster
Others: Waterbolt, The Blaster, Storm 500, Shield Blaster 2000, generic PR gun, generic backpack piston pumper (broken), 3l garden sprayer M, 10l water carrier:

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