What I've been working on

Harness the power of precision mixtures of pressurized flammable vapor. Safety first! These are advanced potato guns - not for the beginner.
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Fnord
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Mon Jun 23, 2008 5:51 pm

Seeing as I haven't posted anything interesting in a while, I guess I'll slip a little.

This is a 2" porting, steel inline piston valve I made in my spare time at my new job. It still needs some grinding and a finished piston, but it seems to be functioning very well even though the piston isn't even sealed/epoxied yet.

I may coat the outside in bondo and sand it down to make a nice smooth surface. I don't like the uneven look of freshly ground welds.

Feel free to spam/speculate away!
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The piston uses a floating oring, meaning it will seal perfectly when the pressure in the back is lower than the front, but not the other way around.
The piston uses a floating oring, meaning it will seal perfectly when the pressure in the back is lower than the front, but not the other way around.
angle.jpg
Seat hasn't been smoothed yet, but it seals fine the way it is.
Seat hasn't been smoothed yet, but it seals fine the way it is.
e1337
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Mon Jun 23, 2008 5:59 pm

Damn, thats amazing. What mix do you plan on using? Can't wait to see this thing in action. I look forward to see the bondo finish.

e1337
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FishBoy
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Mon Jun 23, 2008 6:23 pm

i like it, what are you planning on using it for?
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mark.f
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Mon Jun 23, 2008 8:23 pm

So it's similar to a sprinkler valve in operation (with the ports switched around to be "barrel sealing")?

I haven't posted in a while either, but I can't say I've been doing anything meaningful in my absence. :wink:
sandman
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Mon Jun 23, 2008 8:25 pm

well, 6 more posts and you dont have to do anything meaningful cause ul be 1337 :wink:
THUNDERLORD
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Mon Jun 23, 2008 8:52 pm

Hope it's a piston hybrid.
More pics/completed!!! (Please)
I've enjoyed all your builds! :wink: 8)
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SpudFarm
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Tue Jun 24, 2008 2:21 pm

that is freaking HUGE!

what do you plan on using it for? (scale?)
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POLAND_SPUD
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Tue Jun 24, 2008 2:45 pm

LOL that's awesome... please tell me it's not going to be a handheld launcher
Last edited by POLAND_SPUD on Tue Jun 24, 2008 3:03 pm, edited 1 time in total.
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SpudFarm
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Tue Jun 24, 2008 2:54 pm

if it was handheld it would be a plane because of the recoil :P
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Fnord
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Tue Jun 24, 2008 6:19 pm

i like it, what are you planning on using it for?
My next big project obviously, which being in the hybrid section would make it my next big hybrid project :)
So it's similar to a sprinkler valve in operation (with the ports switched around to be "barrel sealing")?
To my knowledge, yes. I thought most sprinklers were barrel sealers though (?). I've never seen one in person, actually.
what do you plan on using it for? (scale?)
freaking HUGE!
(I think I gave you a rough idea in a pm once. It's not crazy huge, but easily considered "full-size".)

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LOL that's awesome... please tell me it's not going to be a handheld launcher
OK, I won't tell you.
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Ragnarok
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Tue Jun 24, 2008 6:25 pm

_Fnord wrote:
LOL that's awesome... please tell me it's not going to be a handheld launcher
OK, I won't tell you.
...Umm, you are joking... right?

Or do you like entering orbit every time you fire?
Does that thing kinda look like a big cat to you?
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SpudFarm
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Tue Jun 24, 2008 6:29 pm

oh.. that hybrid :D
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Fnord
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Tue Jun 24, 2008 6:39 pm

...Umm, you are joking... right?

Or do you like entering orbit every time you fire?
Keep in mind the power will be limited by the how heavy it can be (the valve weighs around 10 lbs by itself).
The weight will also help with recoil; I have a combustion launcher of comparable weight and power which still has considerable recoil, but based on my observations so far, it should be survivable* with a heavily padded stock.
It might end up being the most powerful handheld out there though. For a while at least.

Edit: though if I had access to titanium, I'd be using the recoil to jump between rooftops in some bizarre combination of spudding/parkour/quake3.

*Fun
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