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silencers

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: integral » Sat Apr 21, 2007 6:32 am

lol u never know... he didnt say that his spuds weren't supersonic...

k got it now cheers jack
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Unread postAuthor: super spuder » Sat Apr 21, 2007 8:45 am

jackssmirkingrevenge wrote:It depends on how you're going to make your silencer. If you're going to make holes in your existing barrel and build an integral device, then it will likely reduce the velocity. However if you fit a silencer as an add-on, there will probably be either no effect on velocity or potentially a slight increase, have a look at the chrony readings at the end of this:

[youtube]http://www.youtube.com/watch?v=NyqZPXIASqo[/youtube]

yea. that is the kind of silencer i was talking about. i forgot about the other kind that goes over top of the barrel. that kind will reduce the velocity. the add on kind will not. sorry for my confusion :x
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Unread postAuthor: Blackett » Sat Apr 21, 2007 1:42 pm

I only know how to build the kind that goes over the barrel. any help with the add on?
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Unread postAuthor: jackssmirkingrevenge » Sat Apr 21, 2007 1:55 pm

perhaps you could post a few details of your launcher?
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Unread postAuthor: Blackett » Sat Apr 21, 2007 6:17 pm

under over design. stun gun ignition.

the chamber is on the bottom and connected with a u bend to the barrel. the propane system sits in the spot between the chamber and barrel. the barrel is four feet so there is plenty of room to work with it if needed to build a silencer.
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Unread postAuthor: joe blogs » Sun Apr 22, 2007 4:13 am

I made a silencer for my pneumatic rifle out of 1/2 inch pvc and on the inside i layered fiberglass sheeting. It work really well. I dont think it slowed the pellet to much because the overall accuracy was the same.
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 22, 2007 4:46 am

What you need is a section of the pipe you used for the barrel, and a wider length of barrel for the silencer body.

This design was posted by LucyInTheSky and should work very well:

Image

You could either build it on your existing barrel, or make a separate unit if you have a means of attaching it to the barrel.
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Unread postAuthor: Bubba05 » Sun Apr 22, 2007 10:51 am

"One solution is to lower the muzzle velocity of the bullet. Some suppressor designs do this by allowing gas to bleed out of the barrel before the projectile exits;"

This is a silencer or a suppressor that is most commonly used to date due to its effectiveness.

"others do it with rubber "wipes" that use friction to slow the bullet. While this method is effective, it dramatically reduces the range, accuracy, and stopping power of the projectile. The wipes generally wear out and lose effectiveness after relatively few shots."

Never hurd of these the only thing that comes close would be a muzzel break? and it dosent sound very effective.

You best bet would be to ither icorparate a silecer that is your barrel or an add on. The add on would be more affective that the the other.

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Unread postAuthor: jackssmirkingrevenge » Sun Apr 22, 2007 12:37 pm

Bubba05 wrote:"others do it with rubber "wipes" that use friction to slow the bullet. While this method is effective, it dramatically reduces the range, accuracy, and stopping power of the projectile. The wipes generally wear out and lose effectiveness after relatively few shots."

Never hurd of these the only thing that comes close would be a muzzel break? and it dosent sound very effective.


On the contrary, while it has a detrimental effect on performance, it is extremely effective at silencing the weapon - indeed this is the system used in the legendary Welrod assasination pistol where long range and accuracy take second place to quietness.
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Unread postAuthor: Bubba05 » Sun Apr 22, 2007 12:46 pm

Fair cop mate! I sapose in a short range single shot application the rubber wipes would be handy. But not out rite survicable in a spud gun and how would you adapt it to said spud gun?

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Unread postAuthor: jackssmirkingrevenge » Sun Apr 22, 2007 12:52 pm

Not a good idea at all in a spudgun, simply because they don't have the spare power in reserve - but we're not playing with the tens of thousands of psi that firearms develop, and the vast majority of spudguns are subsonic anyway, so there's no need to resort to such drastic measures. A conventional silencer with baffles should do the trick in the most cases. The key here is that as with engines, there's no substitute for cubic capacity - the bigger the silencer the more effective it will be.
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Unread postAuthor: Bubba05 » Sun Apr 22, 2007 1:07 pm

I have a silencer for my 65mm barrel. Its a about 50cm long and 80mm in diamiter with a 65mm adapter so it slots and locks onto my barrel and is sealed at one end. I drilled out a 65mm hole in the sealed end so my rojectiles can pass through. got about 50% reduction in noise.

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Unread postAuthor: Blackett » Sun Apr 22, 2007 9:03 pm

so do you think it would be worth it to construct a silencer/ as to the energy loss? If I added on to the barrel with a coupling and then a silencer, I would still lose some energy, but at leaSt I would be able to take it off.
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Unread postAuthor: jackssmirkingrevenge » Sun Apr 22, 2007 9:32 pm

If you made an add-on that was say 1 foot long attached by a coupling I'd say you wouldn't lose any performance.
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Unread postAuthor: Bubba05 » Mon Apr 23, 2007 1:55 am

You wont loose much performance from an add on attachment. They only slow and cool the gasses!

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