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semi automatic cylinder,french airgun

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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semi automatic cylinder,french airgun

Unread postAuthor: jules56 » Sun Oct 10, 2010 12:47 pm

Hi ,this my new project, the idea just Polandspud mister, thank you to him! 8)
caliber 8mm ,Steel,regulated to 5 bar for video ... :wink:

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[youtube]http://www.youtube.com/watch?v=-mmIQtmeJFY&feature=player_embedded[/youtube]
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Unread postAuthor: Lockednloaded » Sun Oct 10, 2010 1:31 pm

looks nice, but can we get a few more specifications? like what size your QEV is, what bore it is, and what ammo you are shooting?
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Unread postAuthor: JDP12 » Sun Oct 10, 2010 1:36 pm

Looks good!! keep the awesome projects coming
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Unread postAuthor: POLAND_SPUD » Sun Oct 10, 2010 1:54 pm

How the hell did you manage to make it that compact? it's as small as a pistol
Good job - that looks great :)


oh you might find this link useful -> http://www.cmatic.it/
It's an italian company selling high pressure push-to-connect fittings and tubing. I am pretty sure that they've got distributors in France

like what size your QEV is

Probably it's 1/4"
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Unread postAuthor: jackssmirkingrevenge » Mon Oct 11, 2010 12:12 am

POLAND_SPUD wrote:How the hell did you manage to make it that compact? it's as small as a pistol


True, puts your Heath Robinson device to shame :P :D

Looks and works great, but shame about the delay between shots.
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Unread postAuthor: POLAND_SPUD » Mon Oct 11, 2010 3:38 am

@jsr
build a working semiautomatic gun that isn't a piece of board with springs strapped to it - then we can talk :D

delay between shots

In this case the only limiting factor is the slide valve. Let's face it - it wasn't designed to be switched from one position to the other quick
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Unread postAuthor: Gun Freak » Mon Oct 11, 2010 6:04 pm

Dude I swear, you have to one-up everything! This is fantastic Jules! Sorry POLAND, but Jules' is way cooler, its smaller and less powerful but it is sick. Amazing job Jules! This makes me want to build a semi! I say you put 30 bar in and see the damage :D On a scale of 1 to 10, its a 10. You never fail to impress us.
Cheers :occasion5:
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Unread postAuthor: Lockednloaded » Mon Oct 18, 2010 8:49 pm

wouldn't it also be helpful if you magazine was airtight?
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Unread postAuthor: Gun Freak » Mon Oct 18, 2010 8:55 pm

Lockednloaded wrote:wouldn't it also be helpful if you magazine was airtight?

Absolutely, but it's easier said than done. Plus, the gain in performace probably wouldn't be worth the extra hassle.
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Unread postAuthor: Lockednloaded » Mon Oct 18, 2010 9:01 pm

Whats so hard about a nipple with a spring and a pipe cap? and If the ammo seals well then the power increase would be noticeable
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Unread postAuthor: lozz08 » Mon Oct 18, 2010 9:56 pm

I agree, it would be much more powerful if the magazine sealed properly.
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Unread postAuthor: Gun Freak » Tue Oct 19, 2010 4:46 pm

It wouldn't matter, a sealed mag would make dead space and by the time the projectile was moving fast, the air loss would be that same in both instances.
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Unread postAuthor: maverik94 » Tue Oct 19, 2010 5:06 pm

Very nice. It looks to be pretty simple, compact, and functional. However, I can hear that there is a significant delay between shots when the chamber is being refilled...
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Unread postAuthor: Lockednloaded » Tue Oct 19, 2010 5:06 pm

It does matter, dead space is heaps better than an uncovered hole at your breech. And how is there air loss when the magazine is sealed? answer: there isn't any
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Unread postAuthor: POLAND_SPUD » Tue Oct 19, 2010 5:09 pm

ohh damn.. this design fires from a closed bolt... so unless you f### something up the magazine is 100% sealed

ROF is low because slide valve isn't the best trigger...
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