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full auto electric drive revisited

A place to ask general spud cannon related questions.
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Unread postAuthor: Antonio » Wed Mar 26, 2008 10:45 am

Where the air input is blocked off. I assume you used an oring or something to seal the whole system when the pipe is still in the backwards postition. You were talking about some leaking, but not too much> that sounds pretty nice.
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 26, 2008 10:50 am

No seals at all, it's just a tight fit ;)
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Unread postAuthor: Antonio » Wed Mar 26, 2008 10:54 am

From my experience it is hard to get a tight fit when using metals. But yeah k, I guess you are ganna fix the leak though right? What are you thinking of?>
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 26, 2008 11:04 am

ant wrote:From my experience it is hard to get a tight fit when using metals.


Metals only, yes, but when you're casting the epoxy around the metal component, the fit is very tight. Not leakproof, of course, but leaks are negligible.
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Unread postAuthor: Lockednloaded » Tue May 04, 2010 8:08 pm

I hope this idea didn't die with this thread... I have an idea!
The bolt will not blow back on it's own because there is no force acting on, well not enough. So why not add a detent so the ammo stays in the barrel longer, air pressure builds, and the rod blows back!
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Unread postAuthor: POLAND_SPUD » Tue May 04, 2010 9:31 pm

this might work at higher pressures
Image

remember BtB's pnushnikov and all that crxx about having delayed blowback ?

well guess why it was delayed?
(becasue it might work on its own... you just need to use larger bore and higher pressures than JSR)
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Unread postAuthor: jackssmirkingrevenge » Tue May 04, 2010 11:37 pm

Lockednloaded wrote:why not add a detent so the ammo stays in the barrel longer, air pressure builds, and the rod blows back!


I had tried this (rather obvious ;P) solution with flared out 0.22 pellets, effectively acting like a detent, and no success. At 100 psi there was simply too much friction. Granted, now I have 8 times that to play with, but that now means that a simple BBMG is good enough :D

because it might work on its own... you just need to use larger bore and higher pressures than JSR


What I don't like about the design is that it is fundamentally flawed, in that the valve starts to close and breech starts to open at the moment of firing, it will be quite a balancing act to get it together and working well.
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Unread postAuthor: POLAND_SPUD » Wed May 05, 2010 7:07 am

well I didn't say that your design is flawless... but that the blowback can work

anyway I think you just have to modify your original design... if you have a look at it it isn't that bad...

...add a DCV or an aircylinder here and there and it might work :D
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Unread postAuthor: jackssmirkingrevenge » Wed May 05, 2010 11:39 pm

POLAND_SPUD wrote:...add a DCV or an aircylinder here and there and it might work :D


You know that excuse works for us, but someday, in the future, when your wife asks why you cannot have children, some suggestions will no longer be valid :D
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Unread postAuthor: POLAND_SPUD » Thu May 06, 2010 6:40 am

if I understand you correctly that's your way of saying that 'yeah you are probably right, but I am having a terrible hangover'
:D
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 16, 2010 4:21 am

You know, if this turns out to be practical, with some modifications you might have a point about this design working at higher pressures...
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Unread postAuthor: POLAND_SPUD » Fri Jul 16, 2010 6:40 am

I see that you realized that it would be good to have a mechanism that closes off air supply when the gun fires :D
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 17, 2010 6:58 am

It's more the idea that one of the inconveniences of the valveless/popoff concept is a pressurised magazine. Not that I've given up on that though, ordered a tube bending set ;)

btw, pending the day with a couple of your countrywomen tomorrow ;)
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Unread postAuthor: POLAND_SPUD » Sat Jul 17, 2010 9:11 am

lol what a coincidence I almost bought one yesterday...
pressurised magazine

I'd use my fullauto circuit to achieve the same effect.... remember this video ??

[youtube]http://www.youtube.com/watch?v=Tp2sKNEZTis[/youtube]

your countrywomen tomorrow
lol dude it's not my fault that other European girls are not as hot...
anyway.... better get ready for a terrible hangover...
there is no chance you can keep up with them
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Unread postAuthor: Ragnarok » Sat Jul 17, 2010 9:54 am

POLAND_SPUD wrote:dude it's not my fault that other European girls are not as hot...

Are you sure? I've heard some rumours...
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