Propane powered gatling gun

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   My question:
For firearm miniguns, the main purpose of the concept is to allow the barrels to cool.  Thus multiple barrels but a single firing chamber.
With the C3, the main heating problem is in the body of the gun itself rather than the barrel.  It would seem to me that you would have to have multiple combustion chambers in rotation for this to work - and at that point, doesn't this just come down to a bunch of C3s taped together?

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Clark Kent Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: 02 July 2004 Location: United States Status: Offline Points: 8716	Post Options Post Reply Quote Clark Kent Report Post Thanks(0) Quote Reply Posted: 18 May 2007 at 11:43am
	My question: For firearm miniguns, the main purpose of the concept is to allow the barrels to cool. Thus multiple barrels but a single firing chamber. With the C3, the main heating problem is in the body of the gun itself rather than the barrel. It would seem to me that you would have to have multiple combustion chambers in rotation for this to work - and at that point, doesn't this just come down to a bunch of C3s taped together?

DeTrevni Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group b-YOU-ick. Was that so hard? Joined: 19 September 2005 Location: Houston, Texas Status: Offline Points: 11957	Post Options Post Reply Quote DeTrevni Report Post Thanks(0) Quote Reply Posted: 18 May 2007 at 11:45am
	I'm not sure, but I think he mentioned using the motion of the barrels to create like a vacuum or a fan to cool the chamber.
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Clark Kent Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: 02 July 2004 Location: United States Status: Offline Points: 8716	Post Options Post Reply Quote Clark Kent Report Post Thanks(0) Quote Reply Posted: 18 May 2007 at 12:19pm
	I saw that - but why bother with the rotating barrels then? Why not just add an external cooling unit? Maby what we need is the opposite system. Rotating combustion chambers hooked up to a single breech/barrel/trigger. They wouldn't even have to actually move, just alternate in their firing sequence.

DeTrevni Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group b-YOU-ick. Was that so hard? Joined: 19 September 2005 Location: Houston, Texas Status: Offline Points: 11957	Post Options Post Reply Quote DeTrevni Report Post Thanks(0) Quote Reply Posted: 18 May 2007 at 12:38pm
	That would cost a HECKUVA lot more than a rotating barrel assembly. Plus, then it wouldn't be a Gatling gun.
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carl_the_sniper Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Strike 1 - 7/29, Bad Linky Joined: 08 April 2006 Location: Canada Status: Offline Points: 11259	Post Options Post Reply Quote carl_the_sniper Report Post Thanks(0) Quote Reply Posted: 18 May 2007 at 1:44pm
	Yes, this has been my problem with the idea. Finding a way to cool the firing chamber. I think it would take a lot to cool something like that down, I don't think fans would get the job done personally. And a question for anyone: If he couldn't cool it properly, wouldn't it melt or at least deform the paintball waiting to be fored?
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irish_paintball Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 13 October 2006 Location: Ireland Status: Offline Points: 13	Post Options Post Reply Quote irish_paintball Report Post Thanks(0) Quote Reply Posted: 18 May 2007 at 2:27pm
	The exhaust gases also heat the barrel, hence the c-3 barrel is mandrel wraped. So the rotating barrels still needs to be, and if they didn't rotate, it wouldn't be a galtin gun as DeTrevni pointed out. Just think, air cooling is a solution, it is just a matter of how much. Chain saws, grass mowers, go kart engines, old beatle, all air cooled. Fair enough they get hot and you will get burnt, but the not that kind of heat will be generated. Picture this, the combustion chamber(s) are in the middle of the rotating barrels. Now think of fans like in jet engine in the middle of the barrels rotating with them. There will have to be a series of them at progresive pitches in order to suck/extract air and force cool air through the fins that are on the combustion chamber. Trust me, you can cool anything with fins, its just a matter of how big you make them. Fins increase surface area = more heat transfer.


e-rok Members Profile Send Private Message Find Members Posts Add to Buddy List Member 3 strikes and hes outta here Joined: 10 June 2007 Location: United States Status: Offline Points: 142	Post Options Post Reply Quote e-rok Report Post Thanks(0) Quote Reply Posted: 15 June 2007 at 12:49pm
	yup, even porshes are air cooled, not to maention this irish dude has almost got his degree in engineering which means he knows way more then the rest of us for example carl which is arguing for the sake of arguing. the idea is bad but irish guy, maybe if you use an even amount of barrels then you could have combustion on the top and bottom barrels to get your 40 b.p.s.

mod98commando Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: 10 June 2002 Location: United States Status: Offline Points: 4432	Post Options Post Reply Quote mod98commando Report Post Thanks(0) Quote Reply Posted: 25 June 2007 at 2:21am
	I was actually thinking the same thing as e-rok with the 2 chamber idea. If you can make it work at 20 bps with one chamber then double up on chambers and make one at top and bottom. It's easier than making rotating chambers yet still gives you a high rate of fire. You could possibly even have more chambers than that if you wanted to. For cooling, I agree that air cooling could work with a big enough heatsink. I would make a big heatsink with vertical fins and then cover the top of it. If you push the air through channels rather than just over the top of an exposed heatsink maybe that would help force the heat away faster. Of course, I'm no expert on the subject but I would think forcing the air through a smaller area would increase pressure and therefore velocity, which would equate to faster heat dissipation. That could help you get away with a smaller heatsink or simply allow you to get more out of it. Covering the heatsink would also allow you to keep the look of a gatling gun on the outside without losing (and possibly increasing the functionality of) the heatsink. Like most of the people that came in here, I thought this would be a ridiculous idea like most of the stuff posted in this section of the forum but if anybody could do it, an engineer could. Therefore, I think this idea could possibly see reality and I'm really curious to see how this comes out. Keep us updated, post some pics/vids if you can.
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