SpudFiles

I have seen people attempt to make silencers for their cannons and I have also tried myself. Now I am sure some of you now this, and I knew it as well but it never dawned on me. Under the large umbrella called the pneumatics, blower and vacuum industry (actually i'm just calling it that) they make exhaust mufflers and silencers with NPT threads and through holes straight thru. They are designed for the exact purpose some of us have been trying to achieve. They even come in anodized aluminum.

http://www.mcmaster.com/#exhaust-silencers/=1rdsi2

Here is a McMaster link. There are many sources other than McMaster as well that have them much cheaper.

The ones on McMaster don't have a hole through them as far as I can see.

Try this pagehttp://www.mcmaster.com/#exhaust-silencers/=1re0k5

This doesn't help, won't link. Click link and then click "exhaust & inline filters" at top

Also, preengineered silencers are actually noise reducers, they merely bring decibel levels down about 20 to 30 decibels, and on a cannon producing 130+, thats not very Silent...

ramses wrote:The ones on McMaster don't have a hole through them as far as I can see.

Yep, those are sintered brass. It would work for suppressing your pilot chamber, but not the firing one.

$70 a go as well


Firearm suppressors are all fairly neat and tidy and small because when you get right down to it they tend to be firing small bullets from small cartridges which produce a small volume of hot gas at a peak pressure of several tens of thousand psi.

So their suppressors cool off the gas, create traps to slow its passage out and provide an internal expansion area.


When you're dumping over a litre of COLD gas at 200psi the only thing you can do is make a long and fat expansion chamber much larger than the cannon chamber itself.

The closest thing I've seen in relative scale is that humorously shaped self propelled artillery silencer.

Actually it's over the top but still, I've not seen anyone going round with a suppressor larger than their cannon round here and that's what's needed.

When you're dumping over a litre of COLD gas at 200psi the only thing you can do is make a long and fat expansion chamber much larger than the cannon chamber itself.

I think the key is not making a pneumatic launcher then making a silencer for it. If you want a quiet launcher, it must be designed from the outset with a carefully matched barrel length and chamber volume, using an efficient valve. The silencer should be integrated into the design so it adds expansion volume without adding bulk, for example by having a hollow stock as part of an extended suppressor.

Hotwired wrote:The closest thing I've seen in relative scale is that humorously shaped self propelled artillery silencer.

You can't mention it without a picture



Whoever said ze Germans don't have a sense of humour hehe

Hotwired wrote:I've not seen anyone going round with a suppressor larger than their cannon round here and that's what's needed.

Have I never shown a picture of the suppressor I built for HEAL? I guess not, because I can't find a photo on my photobucket account of it, nor anything with the search.

Anyway, it looked like I'd attached a small bin to the muzzle - 3,000 cubic centimetres. (For comparison, HEAL's chamber is 650cc, and the barrel and dead volume around 400 cc.)
Did wonders for the volume level, but looked pretty ridiculous, and you couldn't see past the ruddy thing.

Hence, my next suppressor will be somewhat smaller, and just designed to deal with the worst of the sound, not try and achieve mouse fart levels.
Of course, that's neglecting the fact that the attachment I'm most keen to make will probably do sod-all for the volume level.

Mr Epoxy wrote:You can't mention it without a picture

Well, at least they had the modesty to camouflage it.

...also, can you hear speed metal?

If I remember well, this was not a silencer but a device to measure gas exhaust,velocity, that kind of things. It is oddly shaped though...

My mistake. The memory I had was obviously wrong. Here is the complete story of the strange silencer is some are interested:

http://www.ww2incolor.com/forum/showthread.php?p=117739

Sorry for the newbie question but... what is HEAL?

LeMaudit wrote:Sorry for the newbie question but... what is HEAL?

It's a cannon I made about two years back. Actually, the last serious project I actually partook in before what I'm doing now.

This is HEAL.

(Must... resist... 300... reference...)

EDIT: Just to note, although it's not particularly exceptional by today's standards of spudguns - at the time I created it, ~300 psi (argh!) was very high for a cannon of that size, and it was one of the earliest examples of today's prolific larger size high pressure cannons.

At the time, I think it was one of the few cannons which was actually used at 300 psi, rather than which had "been taken to the pressure once with a mate's shock pump".

Basically, although it's reasonably standard fare for a cannon today, it did it two years ago.

(Must... resist... 300... reference...)

Yeah... too many.. I guessed it was a cannon but couldn't found the original thread

I think the key is not making a pneumatic launcher then making a silencer for it. If you want a quiet launcher, it must be designed from the outset with a carefully matched barrel length and chamber volume, using an efficient valve.

with the use of threaded parts you can have two chambers of different volume one for max power and one used with a silencer and change form one to the other when needed

or divide your chamber into two parts and put a ballvalve in between... alternativelly you can divide the chamber into two parts so that when you want to maximize power you can just screw in the other part of the chamber...
one wouldn't even have two use tools or teflon tape when doing this - an o-ring squeezed in between two male-female adapters provides perfect seal... and it can be used on other parts as well (sorry I hope you can understand what I mean.....lol I can provide a pic if someone is interested)
it's the same with barrels - build a normal one and one with an integral silencer


BTW
what is the tool used in the vid about silencers posted by JSR...? I mean the one used when they discuss ' the spilt tube and ring clamp method'? is it just a dremel ?? and how much does it cost ?

LeMaudit wrote:Yeah... too many...

Well, anyone asks how much pressure I use, or calls me mad...

... and then I just have to shout something with too many parses in it in a Scottish accent. For bonus points, I can follow it with an act of violence.