CPSC-97

Build a homemade water gun or water balloon launcher and tell us about it.

What do you think of the design?

Excellent!
0
No votes
Good
1
14%
Average
2
29%
Bad
3
43%
Horrible
1
14%
 
Total votes: 7

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chaosfox97
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Re: CPSC-97

Post by chaosfox97 » Sun Jul 18, 2010 2:09 am

Silence wrote:People have suggested something that slides along the length of the barrel. Hard to do though.

McMaster-Carr's numbers say that LRT will expand to 8x its rest width and 3x its rest length.

Anyway, there are other things you could try if you're looking to do something unique. Making a spherical bladder (using balloons) hasn't been documented very well. Or maybe an air chamber with a piston inside (basically a mini-Supercannon II), so you can reduce dropoff to CPS-type levels? A unique shape, better ergonomics, etc? A well-balanced onboard reservoir? There are lots of options that might be more viable than a double-ended bladder, although I agree that the latter would be interesting and unique. :cool:
In response to your request for a mini Super Cannon II:
PRESENTING: THE SUPER CANNON MINI!
Image
There will be either one or two sealed rods, if two connected, coming out of the back to pull the piston back into place after shots, with a mark on them when to stop.

Fredcompany
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Re: CPSC-97

Post by Fredcompany » Sun Jul 18, 2010 6:55 am

Where's the pump meant to be pumping water to? Where's the piston?
I'm a dude

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mysterio
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Re: CPSC-97

Post by mysterio » Sun Jul 18, 2010 6:57 am

i was wondering the same

Fredcompany
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Re: CPSC-97

Post by Fredcompany » Sun Jul 18, 2010 7:01 am

Is the piston in the long pipe above the reservoir?
If so, then it'll work fine.
I'm a dude

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cantab
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Re: CPSC-97

Post by cantab » Sun Jul 18, 2010 9:12 am

By the looks of it, the pump seems to be an air pump. There's no water pump on that design.
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:

Fredcompany
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Re: CPSC-97

Post by Fredcompany » Sun Jul 18, 2010 9:47 am

then this makes even less sense
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zeda.beta
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Re: CPSC-97

Post by zeda.beta » Sun Jul 18, 2010 4:49 pm

He might be trying to keep separate water and air chambers, because then you could get a more constant flow. But the design still has flaws, and needs to be labeled and thought out.
I reject your reality and substitute my own.
Quack damn you.

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mysterio
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Re: CPSC-97

Post by mysterio » Sun Jul 18, 2010 9:34 pm

yea, where is the water pump?

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cantab
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Re: CPSC-97

Post by cantab » Sun Jul 18, 2010 9:37 pm

You COULD flip the gun over and allow gravity to fill the water side. But then you have to bleed off all the air and mechanically move the piston each time. Not ideal.
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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Silence
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Re: CPSC-97

Post by Silence » Tue Jul 20, 2010 11:34 am

cantab, that was an excellent observation that there is room for sliding. It'll look pretty weird (the length of the barrel changing with volume in the bladder) but it could definitely be a first. chaosfox, use a "saddle" fitting, if you can find one, to latch around the pipe while allowing it to slide. But note that you'll want the case to extend as far as possible - the bladder can't slide out beyond one end of it!

Also, I would use 1/2" pipe everywhere, instead of 3/4". I believe Ben used 3/4" on his APH for a bigger riot blast (or maybe better flow in general), but a 1/2" riot blast is plenty big and you may not care for it anyway.

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chaosfox97
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Re: CPSC-97

Post by chaosfox97 » Wed Jul 21, 2010 7:55 pm

Sorry guys, I was too busy to get on for a while, I'll start at the top from my last post. @Fredcompany: The pump doesn't pump water, it pumps air into the back of the barrel which is above the reservoir. The piston is also in the same location. (In your 2nd post) Yes it is.
@cantab & zeta beta: You are both correct.
@mysterio: There isn't a water pump, it's a air pump, and its located under the reservoir near the back.
@cantab (2nd post): The idea is that drawing the piston back into position will create a vacum, drawing water through the check valve into the barrel, just as a normal piston for a pump gun works, of course, I might make it so the reservoir is on top, so gravity could help and not work against it. And you do have to draw the piston back physically/manually/mechanically after firing, which as I said, puts water in the barrel.
@Silence: I don't know what you mean by "that there is room for sliding," oh wait, you are talking about the actual design at the top, yeah... Well I actualy did some research on saddle fittings, but the size I need would set me back $50, so I think I'm just going to get a large tee. I was thinking 3/4" because I think there are more nozzles, and:
cantab wrote:On pipe dimensions - the run from the pressure chamber outlet to the nozzle needs to be wide for best performance, so if you want a big blast. The diameter of the pump shaft affects the behaviour of the pump - larger diameter means more water pumped per stroke but more force needed to do so. The rest of the gun really doesn't matter, so narrow diameter is probably best for compactness and light weight.
I also found a link showing how you can make you flow more laminar for a 3/4", so that's another reason I'm thinking 3/4", but I think I'll do what cantab suggested.

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mysterio
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Re: CPSC-97

Post by mysterio » Wed Jul 21, 2010 7:56 pm

can you show me the link? for the laminar 3/4"

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chaosfox97
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Re: CPSC-97

Post by chaosfox97 » Wed Jul 21, 2010 8:00 pm

Holy crap mysterio that was a quick reply, 1 minute after lol. Sure, here it is. But guys, vote which one I should make on my new thread titled "CPSC-97 Voting"
Homemade Nozzle: Laminator

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mysterio
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Re: CPSC-97

Post by mysterio » Wed Jul 21, 2010 8:01 pm

that for 1/2" nozzle. plus, the middle white part isnt available at HD or lowes

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chaosfox97
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Re: CPSC-97

Post by chaosfox97 » Thu Jul 22, 2010 6:35 pm

I can make it bigger, and I'm sure they have a sleeve.

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