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Finished 3 Barrel Grenade Launcher

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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Unread postAuthor: Davidvaini » Sat Jun 21, 2008 9:20 pm

Well when you have it loaded with 3 shells and you fire one.. that one becomes lighter than the other ones. So naturally gravity will pull the other two down, thus rotating the barrels. I fired the next shell and it becomes lighter thus the last shell/barrel rotates down. This effect increases even more when i remove the shells that I shot.
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Unread postAuthor: elitesniper » Sat Jun 21, 2008 9:30 pm

Ahhhh!, thats really neat! :) hope ya have fun with it.
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Unread postAuthor: Davidvaini » Sat Jun 21, 2008 10:30 pm

thanks, I hope it gets nominated for the BBMG/Launcher contest.
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Unread postAuthor: Pyro Ninja » Sun Jun 22, 2008 3:31 am

Good job :) , now make a video.
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Unread postAuthor: psycix » Sun Jun 22, 2008 6:12 am

Wow, I like the way of rotating those barrels!
But dont they spin and wobble while moving?

What is the firing mechanism to actually fire off a cartridge?
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Unread postAuthor: Davidvaini » Sun Jun 22, 2008 10:54 am

a button on the back of the co2 inflator. and no the barrels dont spin around and move while moving unless I roll on the ground... in which case it auto corrects itself anyways. Its like a gyroscope in that aspect.
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Unread postAuthor: blind909 » Sun Jun 22, 2008 12:32 pm

If you dont already have a design for the co2 inflator, you could try this, and then just paint the co2 inflator.
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Unread postAuthor: Antonio » Sun Jun 22, 2008 12:47 pm

looks nice. but yeah looks arent that much to me. I would like to c the working. I have read ur other post on the cartriges, why not post a link and ellaborate on the concept. I guess u got inspired by solar right? I am looking foward to a movie:)
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Unread postAuthor: Davidvaini » Sun Jun 22, 2008 2:21 pm

no, what did solar do?

I will post a link to the cartridges from here. I probably won't be able to post a video until after 27th.

Just curious ANT have you seen the video of one of these cartridges firing?
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Unread postAuthor: Antonio » Sun Jun 22, 2008 2:51 pm

yeah for sure:) its look pretty nice. Isnt there a way though that you could precharge the cylinder and burst ehm with a small pin which is attached to the trigger. Btw you are kiddin me that you have not heard about solar> he won the big prize:
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btw my name is ANTON, when I joined this forum I wasnt sure if I should give away my name. I thought I could change it later on. Ant sounds kinds small lol... but yeah anyways
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Unread postAuthor: Davidvaini » Sun Jun 22, 2008 4:17 pm

lol I didnt know you meant that gun, of course I know about solar's revolver but no that is not where I got my idea from... I just decided to make a multi barrel grenade launcher out of a few spare parts.

I could do a trigger system with a reverse spring to slide the bolt back and pierce the cartridges but this is just as easy. Besides I would much rather have a front or side grip anyways for this beast.

Maybe for my rotating 12 barrel I might have something but that wont be for a while.
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Unread postAuthor: Ragnarok » Sun Jun 22, 2008 6:35 pm

Davidvaini wrote:Valves are burst disks and actually the lack of weight of the cartridges being removed/fired actually rotates the barrels.

That's actually damned ingenious, although I assume you won't be able to cant the system too significantly...
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Unread postAuthor: Imortal87 » Sun Jun 22, 2008 7:28 pm

Ragnarok wrote:although I assume you won't be able to cant the system too significantly...


From what I can see you can turn/rotate it anyway you want
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Unread postAuthor: judgment_arms » Mon Jun 23, 2008 9:00 am

Pretty slick!
Gravity reload… HA! Now that is cool.

What’s next?
Perhaps you could build on auto-cannon based loosely off the Autococker mechanism.



Bah… fine… I’ll go work on mine…
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Unread postAuthor: mark.f » Mon Jun 23, 2008 8:39 pm

Nice! Preloaded cartridges seem to be a prevalent method of getting semi-automatic firing. I don't think I would like the gravity reload system too much in a combat situation, though. I'd be too worried of a "jam". Perhaps some sort of ball-bearing locker to keep the barrels aligned with the gasket and to keep the drum from moving when running around or diving into the dust? The ball-bearings would allow enough of a grip so that the drums don't move around wantonly, but will rotate when you turn the drum manually.

Good job!
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