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| jackssmirkingrevenge |
 Posted: 09/23/2007 11:42 AM Post subject: electro-pneumatic full auto design |
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space monkey
Joined: 15 Mar 2007
Posts: 7401
12019.84 Spud Bux
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Following the lack of success of my blow forward experiments, I've decided to try a different approach. The breech is attached to a shaft and is free to rotate, and also has a cutaway. Ammo is fed from the top, air from the bottom, and the rotating hole alternately feeds air and ammo into the barrel. This is a bit of an old concept, SPG had done some work on it on spudtech but nothing concrete had come out of it.
The prototype's being built, I'll keep you posted with the progress.
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| hubb017 |
| Posted: 09/23/2007 11:52 AM Post subject: |
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Sarcasmo
Joined: 28 May 2007
Posts: 1525
703.64 Spud Bux
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Sealing may be a problem but you could probably get it to work right. Also, it seems that the barrel will have to be an exact fit for your ammo or that rotating piece may jam against the next round.
Besides, is there anything you can't do (besides post first in almost every thread)?
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| iPaintball |
| Posted: 09/23/2007 12:17 PM Post subject: |
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Colonel
Joined: 04 Mar 2007
Posts: 713
971.42 Spud Bux
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I can tell this is gonna look sweet. Just make sure you use o-rings and plenty of lube. Again, anotherfull auto design. Stop being so creative! 
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| jackssmirkingrevenge |
| Posted: 09/23/2007 12:21 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7401
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I'm relying on the tight fit to minimise leaks to a tolerable level.
With epoxy you can do anything  here's the breech curing, I basically made a cardboard mould and pored the epoxy in. The rotating bit has been cut too.
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| HaiThar |
| Posted: 09/23/2007 12:27 PM Post subject: |
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Donating Member
Joined: 13 Sep 2007
Posts: 227
96.35 Spud Bux
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| I actually have a fully automatic electric airsoft gun that works just like the one you are suggesting...but it's fed in through a spring loaded magazine.
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| spanerman |
| Posted: 09/23/2007 12:29 PM Post subject: |
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Lieutenant Colonel
Joined: 17 Sep 2006
Posts: 447
296.08 Spud Bux
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| waiting with baited breath for this one!!
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| jackssmirkingrevenge |
| Posted: 09/23/2007 12:31 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7401
12019.84 Spud Bux
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| HaiThar wrote: | | I actually have a fully automatic electric airsoft gun that works just like the one you are suggesting...but it's fed in through a spring loaded magazine. |
are you sure it doesn't work like this?
| Gepard wrote: | What's to stop you just drilling a hole through the wall of a BV? Then just hook the BV up to a motor.....
Might be half as efficient but should have the same effect with less hassle surely? And you could use the second blast to propel it further.... |
Fnord illustrated the idea in this post, SPG had drawn up similar plans on Spudtech. My problem with the ball valve idea is too much drag that would require a very powerful motor to work, but if you're willing to live with that it would certainly work very well.
The great thing about using a motor is that the rate of fire is infinitely variable by altering the revs per minute.
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| Gepard |
| Posted: 09/23/2007 12:31 PM Post subject: |
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Major
Joined: 18 Jun 2007
Posts: 352
727.71 Spud Bux
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What's to stop you just drilling a hole through the wall of a BV? Then just hook the BV up to a motor.....
Might be half as efficient but should have the same effect with less hassle surely? And you could use the second blast to propel it further....
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| HaiThar |
| Posted: 09/23/2007 12:38 PM Post subject: |
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Donating Member
Joined: 13 Sep 2007
Posts: 227
96.35 Spud Bux
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actually now looking back...it wasnt either. It was just electric... 
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| Gepard |
| Posted: 09/23/2007 12:41 PM Post subject: |
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Major
Joined: 18 Jun 2007
Posts: 352
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Ahh thought it'd seen it somewhere - can't you lube it up?
What sort of ROF you trying to get?
Looks good though - you tape up the sides?
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| jackssmirkingrevenge |
| Posted: 09/23/2007 12:58 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7401
12019.84 Spud Bux
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I don't know how effective lube would be. It would certainly make a good design for a full auto marble gun, the valve would be extremely efficient (because the marble would drop into the valve and fire only when the valve was fully opened) but the motor needed to drive it would have to be along the lines of a cordless drill.
I'm aiming for a ROF of around 2-3 rounds per second, to give the "dakka dakk dakka" machinegun effect as opposed to the hosepipe "braaaap" that strafers do. The aim here has always been lower rate of fire but more power per shot.
The box is made from an old airfix sopwith camel box hehe (you can just see the "world war I" script), the tape is used to keep the box together and the edges are then sealed up with glue to contain the epoxy.
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| windshrike |
| Posted: 09/23/2007 13:24 PM Post subject: |
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Sergeant Major
Joined: 28 Jun 2007
Posts: 178
444.10 Spud Bux
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Jackssmirkingrevenge,
you'll do anything to achieve the dakka dakka dakka you've been humming for so long, won't you?
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| jackssmirkingrevenge |
| Posted: 09/23/2007 13:31 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7401
12019.84 Spud Bux
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| every man has a holy grail
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| iknowmy3tables |
| Posted: 09/23/2007 13:37 PM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1145
2729.20 Spud Bux
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no offense man but this is starting to sound like the frequently thought of rotating breech and valve design that we know doesn't work well,
http://www.spudfiles.com/forums/my-first-bbmg-mechanical-bbmg-t4566.ht ml
only diffrence is your kinda making the ball valve which might work but really I've seem you make some crazy stuff but machining such a thing is a feat I don't think any of us can do with basic machining tools
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| jackssmirkingrevenge |
| Posted: 09/23/2007 22:06 PM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 7401
12019.84 Spud Bux
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| Quote: | | no offense man but this is starting to sound like the frequently thought of rotating breech and valve design that we know doesn't work well |
I know the idea has been floating around for years but this is a somewhat different take which I'm fairly confident will work well. It should be ready for basic testing in a few days, watch this space
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