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DEAD 43mm (GB) Semi-Auto Video 2!

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: POLAND_SPUD » Wed Apr 21, 2010 7:39 am

Nice :D
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 21, 2010 7:43 am

c11man wrote:i saved some preformace lose do to chocked flow.


... but at the same time, you're losing air pressure because of air leaking into the magazine before the bolt is fully closed...
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Unread postAuthor: c11man » Wed Apr 21, 2010 9:43 pm

jackssmirkingrevenge wrote:
c11man wrote:i saved some preformace lose do to chocked flow.


... but at the same time, you're losing air pressure because of air leaking into the magazine before the bolt is fully closed...

crap happens, its still plenty powerful

video has been added to the original post enjoy!
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Unread postAuthor: Moonbogg » Thu Apr 22, 2010 12:55 am

WHoa, thats impressive. Excellent job!
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 22, 2010 2:49 am

c11man wrote:crap happens, its still plenty powerful


So I can see, good stuff :)
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Unread postAuthor: c11man » Thu Apr 22, 2010 7:00 am

thanks you guys
and i didnt realize the door would be such an easy target so this weekend i will make a longer vid (properly edited this time) shooting at some 3/4in plywood or similar
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Unread postAuthor: Gaderelguitarist » Thu Apr 22, 2010 7:34 am

Well now after seeing that video I may just stumble back into trying to make a semi again. Might stay low calibur though. Who knows... :roll:

I still think you could cut a foot off of your chamber. I feel as though since you have such an effective bolt, that you should further optimize this for conservation or time and air.
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Unread postAuthor: JDP12 » Thu Apr 22, 2010 9:10 am

Awesome!!! I love the bolt design, I may have to consider attempting something like this on a smaller scale.
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Unread postAuthor: Hubb » Thu Apr 22, 2010 9:21 am

Nice. About the only comment I could make is you may consider adding a detent to keep some of the balls from rolling out the barrel.
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Unread postAuthor: Gun Freak » Thu Apr 22, 2010 1:50 pm

Hubb I was meaning to ask you, does an o-ring detent in ANY WAY OR AMOUNT effect the performance? I want to put one on my GB piston valve cannon, but I'm not sure if it will harm performace.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 22, 2010 2:59 pm

Gun Freak wrote:Hubb I was meaning to ask you, does an o-ring detent in ANY WAY OR AMOUNT effect the performance? I want to put one on my GB piston valve cannon, but I'm not sure if it will harm performace.


Assuming the air has nowhere else to go, a detent will actually increase performance, because it gives the valve more time to open and more pressure buildup behind the projectile before it starts to move. A properly engineered detent can be used on a valveless launcher that would have better performance than a burst disk ;)
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Unread postAuthor: Hubb » Thu Apr 22, 2010 3:03 pm

If anything, it would probably help performance, although it probably wouldn't be noticed with electronics. The detent would hold the round just a little bit longer and will build pressure behind the round before it releases.

I think JSR used this concept in one of his builds...

Edit: Okay, apparently I was too late in my response, but I figured he would have provided the link to one...which he did.
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Last edited by Hubb on Thu Apr 22, 2010 3:05 pm, edited 2 times in total.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 22, 2010 3:04 pm

Hubb wrote:I think JSR used this concept in one of his builds...


Just one :roll:

A good thread on the subject ;)
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Unread postAuthor: c11man » Thu Apr 22, 2010 3:33 pm

it does have a detent but some of the balls are undersized and fell through. so i sorted them and no longer have the problem seen in the video
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Unread postAuthor: c11man » Sat Apr 24, 2010 2:43 pm

did i really have to bump this? well anyway i made a new video of it against some much harder target. its on the top of the original post
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