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PAC WithOutLoss

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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PAC WithOutLoss

Unread postAuthor: Petitlu » Tue Jan 10, 2012 3:40 pm

hello!
Here is a PAC coaxial Hammer!
No loss of air, not exhaust
Pressure: 40bar
Caliber: 12mm
joints are between the barrel and the breech
Block diagram

Image


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Unread postAuthor: jackssmirkingrevenge » Tue Jan 10, 2012 3:52 pm

Looks familiar ;) well done for actually building it :)

Have you tried it out yet?

Why is the diagram signed al-xg :?
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Unread postAuthor: Petitlu » Tue Jan 10, 2012 3:57 pm

thank you very much for the links!

Un PAC has been achieved here with this principle?

It is al-xg who told me about this system and realized the PAC.

EDIT : Not tested, probably tomorrow
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Unread postAuthor: sharpshooter11000 » Tue Jan 10, 2012 4:23 pm

Looks good, that's a cool design. Jack, i know i keep saying about pneumatic cartridges :roll: but you should try a pneumatic cartridge with this sort of design :)
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Unread postAuthor: Petitlu » Tue Jan 10, 2012 4:34 pm

thank you!
I would do later for cartridges, I wanted to make it simple

sorry for the language, I'm French ...
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Unread postAuthor: Gun Freak » Tue Jan 10, 2012 4:52 pm

Cool! Never seen it done before! Looks pretty clean. What pressure will it be operating at? And are the projectiles custom made or fire arm bullets?
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Unread postAuthor: sharpshooter11000 » Tue Jan 10, 2012 4:59 pm

Your English is great, as good as some of my friends who's native language is English! :lol: What sort of fill valve is that at the bottom? I'm assuming it is a fill valve. Good luck with the cartridges! :D
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 10, 2012 4:59 pm

Petitlu wrote:Un PAC has been achieved here with this principle?


I've made "valveless" launchers but not specifically with this principle.

The reason it puts me off is that it requires well finished cylindrical projectiles in order to work.

You could of course use a sabot but it would still require plenty of sabots to be made.

you should try a pneumatic cartridge with this sort of design


It would be relatively simply to make but as above, the reason I never made one is the projectile requirements.
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Unread postAuthor: Petitlu » Tue Jan 10, 2012 5:00 pm

Thank !

projectiles custom !
steel and aluminum skirt
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 10, 2012 5:03 pm

sharpshooter11000 wrote:What sort of fill valve is that at the bottom?


http://store.northshorecompressor.com/p ... ipple.html
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Unread postAuthor: Petitlu » Tue Jan 10, 2012 5:06 pm

Pressure : 600psi

Projectile :

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Unread postAuthor: sharpshooter11000 » Tue Jan 10, 2012 5:07 pm

jackssmirkingrevenge wrote:
Petitlu wrote:Un PAC has been achieved here with this principle?

The reason it puts me off is that it requires well finished cylindrical projectiles in order to work.

You could of course use a sabot but it would still require plenty of sabots to be made.


Talking about sabots, would a captive piston not work here? I suppose a captive piston is kinda pointless in a cartridge but for full size?
Aah never thought of a paintball nipple :roll:
Also nice ammo :wink: did you machine them yourself?
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Unread postAuthor: jackssmirkingrevenge » Tue Jan 10, 2012 5:11 pm

Of course when you're commited to make sexy projectiles, it will work :)

Wouldn't it have been easier to put the o-rings on the projectiles than on the breech? Just my intuition.

would a captive piston not work here?


The problem is having it survive intact enough to seal again, you'd probably have to make one per shot anyway.
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Unread postAuthor: sharpshooter11000 » Tue Jan 10, 2012 5:15 pm

Hmm I suppose, what's the point in captive pistons then?
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Unread postAuthor: Petitlu » Tue Jan 10, 2012 5:16 pm

No, it's easier to put seals on the inside
Tomorrow I would do pictures of the joints of the bolt and barrel

Connection paintball

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