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| Grignacke |
 Posted: 08/16/2010 14:15 PM Post subject: Gas Operated Reload |
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Private First Class
Joined: 20 Jun 2010
Posts: 33
87.09 Spud Bux
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Hello. I was brainstorming a method of quickly reloading a simple (or complex) combustion spud gun. Eventually Gas-operated reloading system used by guns such as the AK-47 got me thinking about applying that principle to the potato cannon.
The attached video shows how such as system, in my mind, would work. Please excuse my total lack of scale, it's just an animated sketch to get the idea down.
(It's not in the video, but mid barrel, there should be a wye pvc section with an appropriately angled section to port the gas from the combustion down to the breech). |
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| Grignacke |
| Posted: 08/16/2010 14:17 PM Post subject: |
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Private First Class
Joined: 20 Jun 2010
Posts: 33
87.09 Spud Bux
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| Is there no video? I am a newbie to the forums, could I reply with the included animation somehow? |
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| Gun Freak |
| Posted: 08/16/2010 14:17 PM Post subject: |
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The Anti Hybrid
Joined: 25 Jan 2010
Posts: 4209
332.12 Spud Bux
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There's no video.
Try uploading it to youtube and then attaching it to your message. |
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| geardog32 |
| Posted: 08/16/2010 14:22 PM Post subject: |
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Master Sergeant
Joined: 22 Jun 2009
Posts: 173
469.09 Spud Bux
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| Hello and welcome to Spudfiles. your animation or video you tried to attach did not seem to work. Also this idea has been thrown around many time before. The general conclusion is that the pressures in a potato cannon are not great enough to cycle an action like what you are talking about. real guns work at pressures in the thousands of psi not the hundreds like most spud guns use. You can use the search button to find several other post just like yours and get some other views on it. I hope this doesn't discourage you in any way. If I were you I would check out the cannon showcases and get some ideas going for your build. |
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| Grignacke |
| Posted: 08/16/2010 14:23 PM Post subject: |
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Private First Class
Joined: 20 Jun 2010
Posts: 33
87.09 Spud Bux
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| Grignacke |
| Posted: 08/16/2010 14:30 PM Post subject: |
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Private First Class
Joined: 20 Jun 2010
Posts: 33
87.09 Spud Bux
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| geardog32 wrote: | | Hello and welcome to Spudfiles. your animation or video you tried to attach did not seem to work. Also this idea has been thrown around many time before. The general conclusion is that the pressures in a potato cannon are not great enough to cycle an action like what you are talking about. real guns work at pressures in the thousands of psi not the hundreds like most spud guns use. You can use the search button to find several other post just like yours and get some other views on it. I hope this doesn't discourage you in any way. If I were you I would check out the cannon showcases and get some ideas going for your build. |
thanks for the insight! |
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| Lockednloaded |
| Posted: 08/16/2010 14:41 PM Post subject: |
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El Moderador
Joined: 03 Sep 2009
Posts: 1345
376.81 Spud Bux
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Thats a cool idea, but it could easily be simplified; have you thought of using an air cylinder to aid in loading?
| geardog32 wrote: | | Also this idea has been thrown around many time before. The general conclusion is that the pressures in a potato cannon are not great enough to cycle an action like what you are talking about |
It has been implemented successfully; it is used here and is able to handle semi and full automatic cycling |
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| Grignacke |
| Posted: 08/16/2010 14:51 PM Post subject: |
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Private First Class
Joined: 20 Jun 2010
Posts: 33
87.09 Spud Bux
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| Perhaps, but the thing that attracted me to this idea was the gas cycle. I like the air cylinder as an aid is an attractive prospect... |
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| Crna Legija |
| Posted: 08/17/2010 0:14 AM Post subject: |
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shots shots shots
Joined: 20 Jul 2008
Posts: 1912
1660.53 Spud Bux
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| jackssmirkingrevenge |
| Posted: 08/17/2010 0:54 AM Post subject: |
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aspiring machinist
Joined: 15 Mar 2007
Posts: 18051
32498.46 Spud Bux
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That looks quite crude, I'm sure there are more elegant ways of using a gas piston, such as driving a sleeve over the barrel.
You should also consider the blow-forward style bolt:
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| Fnord |
| Posted: 08/17/2010 8:56 AM Post subject: |
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reenigne
Joined: 13 Feb 2007
Posts: 1904
3926.49 Spud Bux
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| I can see this potentialy working, but with the low pressures from plain combustion I doubt it would cycle in a dry-fire test. With a projectile in there keeping the pressure up I don't see why not, but you may need to place the port farther up the barrel than you'd expect. |
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