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2" bore rapid fire airgun

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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2" bore rapid fire airgun

Unread postAuthor: wdr0 » Tue Oct 28, 2014 8:57 am

So as some of you may have seen I built a large pneumaric: pneumatic-cannons/topic25933.html, and I also recently built a large hybrid: hybrid-cannons/topic26008.html. I have an idea for yet another piece of oversized gas artillary. As of now, my freind(whose house the cannons are at) and I are supposed to go pick up a 250cfm trailer mounted compressor. It is currently not functional, but the idea was if we get it running to use it as an air source for a large (2"?) magazine fed cannon. Now my questions are 1. I am considering modifying the existing 2" cannon for rapid fire, or maybe making a golf ball sized unit. Which of those do you guys think would work best keeping in mind the 250cfm available air flow. Don't know the pressure out put, but it will be atleast 100 psi. Secondly if I modify the existing cannon how would I change the barel sealing piston valve for auto or semi auto operation. I look forward to your input, feel free to point me in a different direction with any ideas you might have. Thanks.
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Re: 2" bore rapid fire airgun

Unread postAuthor: dart guy » Tue Oct 28, 2014 5:47 pm

Well rapid fire depends on what you are looking for, I bet even with a good air compressor if the air tank is too drained then it will not fill at the same speed. So at some point the air pressure will take longer to refill because the compressor is filling the tank as well as the airgun( assuming that this is a compressor that has an airtank it would be like 100 cubic inches + chamber size when filling) so semi auto for more than like 3 -4 shots would either slow down a lot after or lack desired power.
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Re: 2" bore rapid fire airgun

Unread postAuthor: wdr0 » Tue Oct 28, 2014 8:40 pm

That's about what I thought. Off hand I feel the golf ball sized one would be feasible. My idea, not sure how realistic was basically to have an automatic capable setup that could fire golf balls at an undetermined rate almost continuously. Now I am not sure, but I think a 250 cfm compressor can keep up. It's the engine driven soft on a trailer used for jackhammers. This one can run multiple of them. Not sure yet but I believe it is capable of 150 psi. Based on charts for sandblasting it seems it can maintain 100 psi while exhausting throug a 7/16 to 1/2" orfice
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Re: 2" bore rapid fire airgun

Unread postAuthor: mobile chernobyl » Wed Oct 29, 2014 10:33 am

rapid fire 2" hybrid.

(just putting it out there :) )
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Re: 2" bore rapid fire airgun

Unread postAuthor: wdr0 » Wed Oct 29, 2014 11:29 am

A multi shot hybrid is something I have considered. I have some ideas for that that I would like to peruse in the future. But I think they will require use of machine tools for proper function. Although I plan to have a lathe and mill in the future I don't currently have the resources to acquire them. So in the interim I think I can build a well performing pneumaric rapid fire gun with the resources I have Which does include occasional acces to machine tools. But yes I have some ideas in the back of my head for a 2" rapid fire hybrid or Gatling gun type arrangement. Currently I am leaning toward the golfballs with this one for ammunition ability. I have a lot of ideas though.
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Re: 2" bore rapid fire airgun

Unread postAuthor: dart guy » Wed Oct 29, 2014 4:05 pm

I'm not sure, I got my own air commpressor. But I guess it is not for jackhammers, ( wasn't sure what type of compressor it was, mine is only for like paint guns I guess) well if it capable of that you should be fine, try making a realy big qev set up.
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Re: 2" bore rapid fire airgun

Unread postAuthor: wdr0 » Wed Oct 29, 2014 8:32 pm

Yeah, it's big. 2" airline out. With atleast a 75 hp engine. My freind's dad plans to do sandblasting with it.
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Re: 2" bore rapid fire airgun

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Re: 2" bore rapid fire airgun

Unread postAuthor: wdr0 » Fri Oct 31, 2014 10:03 am

Well this plan is going to remain a plan for the time being. We pulled the heads on the compressor engine and it is pretty well toast, rusted solid. We may find another compressor or find a new engine for this one though, so I am going to continue working on plans for this project.
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