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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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Unread postAuthor: Solar » Tue May 21, 2013 12:34 am

Image[/img]

Image


75 gram projectile at 243 fps + shooting from hip= Time to upgrade the backstop.

Round went through garage and dented the back wall.
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Unread postAuthor: jakethebeast » Tue May 21, 2013 1:36 am

Now that's a costly failure! :D
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Unread postAuthor: jackssmirkingrevenge » Tue May 21, 2013 1:46 am

hehehe

You know, when the Israelis want to kill protesters, they use actual firearms ;)

http://mondoweiss.net/2011/01/another-m ... stine.html
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Unread postAuthor: Solar » Tue May 21, 2013 4:52 am

The projectile at this speed is designed to be shot at a target up to 100 meters downrange, this is why it is important to have the ability to vary the velocity down to 175fps (still 100 joules at the muzzle) when the ranges are closer in.

Interesting article about the 10/22's, it goes against everything that is known about less-lethal design to use such a small caliber since even the .68 FN303 has been known to be too small for safe use on human targets. 37 and 40mm is not likely able to penetrate between the rib cage or eye socket.

I will post some videos once we get set up at the new shop. I am installing the high speed camera software on my new laptop tonight.

The use of rounds that are effective at lower velocities will be a huge improvement over current blunt impact techniques, but for now the improvement over velocity control will be the next step forward in preparation for that.
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Unread postAuthor: jackssmirkingrevenge » Tue May 21, 2013 6:24 am

Solar wrote:The projectile at this speed is designed to be shot at a target up to 100 meters downrange, this is why it is important to have the ability to vary the velocity down to 175fps (still 100 joules at the muzzle) when the ranges are closer in.


Do you have a range selector on board? I remember suggesting somewhere that one way to do this was to have ports in the barrel covered by a sleeve, and exposing more ports would reduce the velocity. The issue of course would be that you waste the same amount of air per shot whether short range or long range.

Interesting article about the 10/22's, it goes against everything that is known about less-lethal design to use such a small caliber since even the .68 FN303 has been known to be too small for safe use on human targets. 37 and 40mm is not likely able to penetrate between the rib cage or eye socket.


Predictably they turned out to be pretty lethal and have been withdrawn from crowd control use.
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Unread postAuthor: Kilash » Tue May 21, 2013 4:13 pm

Wow...

How you gonna fix that hole?
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Unread postAuthor: dart guy » Tue May 21, 2013 6:50 pm

i think that if you use a cardboard*6+ plywood+ metal +plywood laminate as a back stop you wont be able to realy do much damage or get hurt from rebounds :) if you think i am trolling then i am sorry but im not trying
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Unread postAuthor: Solar » Wed May 22, 2013 2:13 am

We usually shoot into a netting with a sand floor but I was just anxious to chronograph the new rounds. I was paying more attention to getting the shot over the chrono than hitting the target. As far as fixing it I will replace the panel and try and find the spare paint from the garage being painted.... might wind up trying to match it or repainting.
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Unread postAuthor: cammyd32 » Wed May 22, 2013 4:45 am

My sympathies, When I was a lot younger, the first pneumatic I made was a little overpowered from what I thought it would be, I shot it in my garage at a plywood target and it went straight through and put a hole through the mild steel garage door backstop, best to say my dad was not pleased when he got back from holiday and found a badly bodged job of hammering back the plate and painting over the hole...
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Unread postAuthor: jackssmirkingrevenge » Wed May 22, 2013 4:53 am

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Unread postAuthor: Hubb » Wed May 22, 2013 12:23 pm

That's kinda funny...
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Unread postAuthor: Solar » Wed May 22, 2013 11:59 pm

Jack, we have a velocity selector above the piston grip that selects between 4 velocities at any given pressure. It allows the gun to be more efficient at lower velocities even though the pressure is constant.

http://www.youtube.com/watch?v=F9I76NXdRdY

You can see it on the old version here. We are using something more like a focus ring instead of a lever now that acts as a cover.
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