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Silencing a QEV Pneumatic

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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Silencing a QEV Pneumatic

Unread postAuthor: Marco321 » Sat Oct 24, 2009 10:46 pm

Hey
Im designing a QEV pneumatic, the bore will be around 14mm, the chamber around 14mm as well. I have like 90% of the details worked out, but one part i need assistance on is making it relatively quiet, as i live in Australia.

Here is what I was thinking, I could make the chamber volume slightly smaller than the barrels volume, as well as making a silencer. I have seen multiple designs on silencers here, so im not asking about how to make one of those.

Im just after people ideas on what else i could do to make it quiet, as well as what sort of affect it will have the the power, if the chamber volume is like 90% of the barrels volume.

Thanks
Marco
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Unread postAuthor: Technician1002 » Sat Oct 24, 2009 10:57 pm

This thread covers an attempt at making one silent. In the end success. View the oversize barrel video on the second page. Listen carefully to the tennis ball launch in the park. At 110 PSI that combination is very quiet. The clank of the valve into the bumper is louder than the launch.

http://www.spudfiles.com/forums/failed-attempt-at-a-silent-tb-launcher-t17989.html
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Unread postAuthor: Crna Legija » Sat Oct 24, 2009 11:07 pm

you could put a suppressor on the vent, there pretty loud aswell
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Unread postAuthor: Marco321 » Sat Oct 24, 2009 11:12 pm

Thanks for the speedy replies!!!

My vent will be housed inside the steel frame of my gun. It's more the gunshot sounds I need to silence. I'll report back here with my solution :D. Any more ideas will be appreciated :D
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Unread postAuthor: Marco321 » Sat Oct 24, 2009 11:12 pm

Thanks for the speedy replies!!!

My vent will be housed inside the steel frame of my gun. It's more the gunshot sounds I need to silence. I'll report back here with my solution :D. Any more ideas will be appreciated :D
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Unread postAuthor: inonickname » Sat Oct 24, 2009 11:45 pm

Also consider what you're actually shooting into. I've found that shooting into metal plates and the like is actually louder than the muzzle crack.

Higher pressure, smaller chamber, large suppressor.
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Unread postAuthor: cheeseboy » Sun Oct 25, 2009 4:38 am

:D you know, I have not had to post any new topics with questions like these, you're venture back into spudding is pretty much completely parallel to my own, it's like following a set of instructions! 1/2" QEV bolt action, hammer valve piloted cannon? my reasoning is that the sound won't be as loud because its a multi-shot cannon as opposed to my previous one which just dumped the whole chamber out at once, though you can't be to careful these days! you still live same suburb as me? swear you must be an alternate personality....
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Unread postAuthor: Marco321 » Sun Oct 25, 2009 7:20 am

Ill most likely be shooting into a large wooden box, backed with lots of fabric to absorb the impact. The target will be something standard, maybe some archery targets to cans or something like that.

My gun will be copper, so ill try go for smaller chamber and maybe 130psi. Im not really after lots of insane power, just a fun plinker, with a nice bolt mechanism. As well as something that looks really cool and is very reliable as well as ergonomic. Which is why im liking the idea of a hammer valve with a bolt action valve and magazine and a CO2 power source.

cheeseboy wrote::D you know, I have not had to post any new topics with questions like these, you're venture back into spudding is pretty much completely parallel to my own, it's like following a set of instructions! 1/2" QEV bolt action, hammer valve piloted cannon? my reasoning is that the sound won't be as loud because its a multi-shot cannon as opposed to my previous one which just dumped the whole chamber out at once, though you can't be to careful these days! you still live same suburb as me? swear you must be an alternate personality....


My QEV gun will dump most of the air in the chamber, well i plan it to. Im currently in the process of designing a hammer valve mechanism for it as well, so i can eventually implement a CO2 canister. As i cock the hammer, the bolt is cycled to load new ammo into the gun at the same time as cocking the hammer. But one problem i forsee with this is safety, if i accident let go of the hammer half way through the cocking process, it will hammer the valve, causing the gun to shoot and have the bolt blow back at my face or something of that nature. one solution i see is having the hammer cocking mechanism separate from the ammo loading mechanism. That way if i accidently let the bolt slip from my hand, there will be no ammo in the gun to shoot, and the bolt will be in the safety position.

I live in right near Hornsby :D, moved from Wahroonga :P, but still very close by :D
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