WIP: 1.5" Porting Handheld Piston Hybrid (DAMAGE VIDS)

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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c11man
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Thu Jun 24, 2010 3:05 pm

if it does fail just get a peice of plastic or metal and cut it to size and drill a hole in the middle, thats what i have done several times so that is exactly the right size

also you might want to sand down the 2inch nipple so that is smoother for the orings to seal on

and filling twice with air might get annoying
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Thu Jun 24, 2010 3:19 pm

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Fri Jun 25, 2010 1:14 am

Damn, thats a nice piece of kit. Very nice job. Well, theres no turning back now. Piston hybrids are coming of age and are set to become more common. Thanks for showing your internals. This helps me understand more about just how this design functions.
Consider incorporating a check valve attached to the piston somehow. I heard someone else mention this idea before. This would allow you to pressurize once through the pilot, pressurizing the pilot and chamber with no combustion force being able to enter the pilot area. It might not be able to be incorporated with this design, I don't know. Just thought i'd throw it out there. Very good job!
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Fri Jun 25, 2010 1:57 am

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ramses
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Fri Jun 25, 2010 12:29 pm

How did you get the pipe the piston seals against into the tee? did you thread the other "half" of the bushing?
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CpTn_lAw
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Sun Jun 27, 2010 5:34 am

Aren't you afraid of the hit in your shoulder? I mean, first tests obviously are fired remotely, but after a while you're gonna shoot it as i is meant to.
I would be scared...
I remember of the hole punch i shot and...i took me off my feet. Might i add, my hybrid does not come close to the level of energies you're playing with...
Be carefull
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Crna Legija
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Sun Jun 27, 2010 8:36 am

Mabye start with something a bit lighter, i get a pretty big kick shooting 50g of lead at 300psi and i have a 1 1/4 inch thick wood stock.

what dia is you meter/stock?

At least get a vid of you shooting, if you get knocked over put it on Funniest home videos :lol:
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Sun Jun 27, 2010 9:27 am

SpudBlaster15 wrote:So long as everything works as it should, the 160g battery slug should give me ~3200ft-lbs of muzzle energy at a 5x mix. Possibly the most energy ever obtained from a shoulder fired spudgun?
well technically......you'll probably need to go heavier to obtain that record
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Sun Jun 27, 2010 11:56 am

Good job SB, might I ask what the "incident" was?

You should try to shoot a light projectile at a watermelon. It is damn fun!

I guess this cannon reaches higher energies, it's a hipfired cannon though.
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Oh, and don't you have a worry about something causing the piston to come out of the tee and into your eye? That would be quite nasty.
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Sat Jul 03, 2010 2:39 am

Great stuff, gotta love shotgun rounds :D how about a fistfull of 0.177" steel BBs?
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Sat Jul 03, 2010 2:44 am

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Last edited by SpudBlaster15 on Thu Jul 15, 2021 1:01 am, edited 1 time in total.
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