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piston idea for hybrid

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Will it work?

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piston idea for hybrid

Unread postAuthor: pat123 » Fri Mar 28, 2008 4:41 pm

I am thinking about trying this idea. do you think it will work?

here is the gun I want to use it on

http://www.spudfiles.com/forums/pat123s-hybrid-rifle-t13786.html

edit: sorry forgot to post the pic
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Last edited by pat123 on Fri Mar 28, 2008 6:40 pm, edited 2 times in total.
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Unread postAuthor: STHORNE » Fri Mar 28, 2008 4:45 pm

go 4 it. and if it doesn't suit your needs...just take 'er off.
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Unread postAuthor: SpudFarm » Fri Mar 28, 2008 5:01 pm

your choise! piston hybrids work if well made ;)
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Unread postAuthor: pat123 » Sun Mar 30, 2008 3:55 pm

the only problem is that the force may blow it out the barrel.
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Unread postAuthor: ALIHISGREAT » Mon Mar 31, 2008 3:17 am

well there is the possibility it will get blown out of the barrel, it could close before the chamber reaches atmospheric pressure again, it would restrict the power alot and i don't mean to sond harsh but i don't thnk its a very good idea :wink:

Alasdair.
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Unread postAuthor: pat123 » Mon Mar 31, 2008 2:54 pm

does fnord have the only piston hybrid on this site?
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Unread postAuthor: bigbob12345 » Mon Mar 31, 2008 3:18 pm

what, you dont like cutting burst disks

And fnord does have the only one on this site but correct me if Im wrong.

two problems i see with it
1. Flow constriction
2.It getting blown out the barrel(already mentioned but i would say it is not only possible that it will happen but likely)

so if you think you can get it to work then sure but i think it would be better if you just made a barrel sealer like fnord
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Unread postAuthor: Hubb » Mon Mar 31, 2008 3:27 pm

Fnord constructed a coaxial type, didn't he?

I remember a topic a while back about persons trying to determine what the psi in a hybrid combusting is. I don't remember the exact numbers, but they were pretty high. What that means is that you're probably going to need something besides screws or nails to keep that piston from turning into ammo.

On the other thread, you spoke of 4x, correct? 4x mix is going to be around 45psi. That means you need a spring of at least that to keep the piston sealed on the chamber (give or take, I don't know your exact measurements). Seeing as how you have a steel hybrid, it can hold more, which means you will have to compensate for higher mixes with that spring.

Find Fnord's piston hybrid and see how it works. And keep thinking. You'll get it worked out.
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Unread postAuthor: pat123 » Mon Mar 31, 2008 3:36 pm

I sent Fnord a pm about is valve. I couldn't figure out how it worked exactly. does it work like a normal pneumatic barrel sealer?
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Unread postAuthor: bigbob12345 » Mon Mar 31, 2008 3:38 pm

Yes it is a normal barrel sealer but I think it has an o-ring on it
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Unread postAuthor: pat123 » Mon Mar 31, 2008 6:18 pm

What kind of spring would you use? Maybe a spring out of a sprinkler?
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