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PCP bolt action bb rifle

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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PCP bolt action bb rifle

Unread postAuthor: ghostman01 » Sat Apr 05, 2008 4:52 am

Muuuahhahahaha i have designed another gun.
This is a multishot pcp with a bolt action breech loading system, the ammo when it is ready to be loaded is put into the breech by sliding the bolt back and by inserting it into the barrel and kept there by my balloon breech system. the breech is the slid back forward and the balloon seals it against a hole inside the breech on a end cap that has been moddified, air is then put into the secondary chamber from a primary chamber and then that is then sealed off. you then pull the trigger which is some sort of valve..... and the air released then goes up through the pipe in to the breech and threw the barrel. and the cycle is repeated. heres my only drawing of what this should be like, i think this will be my next project some how. i would like to some how connect the secondary chamber refil valve to bolt so when you pull it back it opens the valve and then when you close it, it closes the valve, i was thinking of some sort of gear system and a small ballvalve. If this is made correctly it should by rights have alot of power.

specs:
all pvc, execpt barrel
barrel is 10mm, 8mm id aluminum.
will be pumped up too around 120-150 psi depending on chamber materials and sizes.
the secondary chamber will on a ratio to barrel of c:b 1.2:1 or so

if i have forgotten any thing or i need to add anything to the specs please say.
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Attachments
pcp.jpg
SMDC0003.JPG
main chamber is huge, and the secondary chamber
SMDC0005.JPG
bolt parts
SMDC0009.JPG
p chamber and s chamber with out second valve, with bolt below
SMDC0010.JPG
breech open
SMDC0011.JPG
showing bolt open and handle
SMDC0012.JPG
breech closed
SMDC0011 1.JPG
finished gun w/o bipod
Last edited by ghostman01 on Mon Apr 14, 2008 11:43 pm, edited 5 times in total.
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Unread postAuthor: sniperjosh » Sat Apr 05, 2008 7:43 am

Well in theory this will work, depending on your choice of ammo and firing valve I believe. I think a PCP is best used for small, lightweight projectiles as not as much air is required and thus a higher number of shots per fill (which is the whole point of PCP). The firing valve will need to be tuned to allow the right amount of air through, so that there isn't any wasted. This gun will have to have some degree of adjustment to allow it to be "tuned" for efficiency and power.

Anyways, keep the ideas flowing
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Unread postAuthor: ghostman01 » Sat Apr 05, 2008 8:36 am

yeah i still cant decide on which kind of valve to make or buy, and even though i've been a member on here for a while now i still haven't work out exactly how to make a piston valve in a tee ?? even after looking at all the things on the wiki people drawings mmmm ill get it one day
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Unread postAuthor: Gippeto » Sat Apr 05, 2008 9:08 am

Looks like a promising idea. :)

There was a short discussion on piston valves here;

http://www.spudfiles.com/forums/piston- ... 13478.html

At least one person found it helpful. If you would like help, just ask.
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Unread postAuthor: ghostman01 » Sat Apr 05, 2008 9:40 am

no worrys thanks, hey ive got an updated better diagram of it now bit hard to understand but ill maybe make an animation soon, this is for any one that lives in australia, do you know where i can get a cheap 1/2 qev from.


or more to the point, what sort of valve do you guys recomend i use for this design
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