Suppressor baffle design - single assembly

[jackssmirkingrevenge]

Dainty little tubes as on a small calibre rifle are not going to do much.

Thank you!

So multiply by 50 = 1500 cc / 1.5 litres

That's the rough rule of thumb, but really "as big as you're willing to live with".

Quick question: has anyone tried using wipes in an air rifle suppressor?

I have done some experiments in the past, mainly using bicycle inner tube that would be perforated by the passage of the projectile at exit end of the suppressor, and they do have a significant effect when it comes to sound reduction, however there are two major downsides:

- they have a significant effect on power, particularly when used with "marginal" devices such as commercial CO₂ pistols.

- they have an even bigger effect on accuracy.

The Welrod pistol for example used wipes and was extremely effective, yet was intended to be used at "same room" range, so effective sound suppression was much more important than accuracy, and a reduction in power was also beneficial given the fact that the 9mm round was potentially supersonic.

The De Lisle Carbine of the same era was intended for a range of several hundred meteres, so accuracy was important, and fired the naturally subsonic 45 ACP round, and therefore didn't use wipes.

[Zeus]

Once my hybrid is completed, I'll do some experiments with reasonable mixes ~10x.

I have some ideas involving easily replaced wipes and very large volume, I'll see if one has any advantages over another.

[FighterAce]

Totally forgot about sketchup

This is what I had in mind...



Milling out a club shape along the entire length of the baffle.... and then sleeving it into another piece of Al pipe. I calculated the volume for 10x45cm baffle is about 2000cc

[jackssmirkingrevenge]

Looks good, but far too much of the volume is taken up by the baffle material in my opinion if you just repeat the above pattern. I would suggest for the next pattern turning the cylinder 90º and boring another "club" shape in the opposite direction, in such a manner that they mesh together, and repeat. If the outside of the cylinder were a tube and opened out it would look something like this:

[FighterAce]

Something like this?




Note how big of a hole that leaves between the separate cube shapes. Shouldn't there be a hole, slightly larger then the barrel ID, separating the different "chambers" in the baffle?

[jackssmirkingrevenge]

Note how big of a hole that leaves between the separate cube shapes. Shouldn't there be a hole, slightly larger then the barrel ID, separating the different "chambers" in the baffle?

In this case one "chamber" is covered by the two meshed opposing club shapes, I pictured them being closer together. That means that the one in my diagram would have three separate chambers.

[FighterAce]

Yeah that sounds more effective

Man how the hell do you calculate the volume of such shape??

[jackssmirkingrevenge]

Man how the hell do you calculate the volume of such shape??

Make it then fill it with water

[FighterAce]

What about the materials? Maybe machine a polyetheline bar with the club pattern and then sleeve it with an aluminum pipe?

I can't think of anything lighter...

[jackssmirkingrevenge]

To be honest, I still don't see the practical benefits of this layout over a conventional baffle stack as I had done here for a pneumatic, but I think I understand the appeal.

Yes, some kind of synthetic polymer seems to be the best material to make it out of in terms of being light while still able to resist the blast of air coming out of the muzzle.

[FighterAce]

Thats the thing... blast coming from the muzzle... I'm hoping all these sharp corners and bends will trap as much of the air as possible...

I tell you what... when I make this suppressor I'm gonna make one baffle your way... and then compare the 2

[jackssmirkingrevenge]

I tell you what... when I make this suppressor I'm gonna make one baffle your way... and then compare the 2

It would be perfect if you could make a test unit which could allow different baffle arrangements to be inserted in a sleeve, it would give a measure of how baffle shape affects noise for the same length and diameter.

I don't mind being proved wrong in the interest of progress

[saefroch]

Man how the hell do you calculate the volume of such shape??

It's actually possible if you know the radius of each circle and how much they overlap. You add together the circles, then subtract the area of overlap.


To find the area of overlap, fit a triangle into each black region. The red region is another convenient triangle. Then by using the length of one of the longer sides of those triangles and the radius of one of the circles, you can determine the last bit remaining by calculating the area of a sector, then fitting in a triangle from the center of a circle to the boundaries of the arc and subtracting that, you have the remaining bit. Multiply that by 6 and add it to the area of the 3 congruent triangles fitted into the black regions and the triangle fitted into the red region, and you have the area of overlap.

If you're going to go through all of that already, I'd just assume that the volume of each is just that area times the thickness of the pipe .

Probably more work than its worth, I suggest using JSR's method, but you did ask .

[jakethebeast]

do i see win XP pro x64?

[FighterAce]

To find the area of overlap, fit a triangle into each black region. The red region is another convenient triangle. Then by using the length of one of the longer sides of those triangles and the radius of one of the circles, you can determine the last bit remaining by calculating the area of a sector, then fitting in a triangle from the center of a circle to the boundaries of the arc and subtracting that, you have the remaining bit. Multiply that by 6 and add it to the area of the 3 congruent triangles fitted into the black regions and the triangle fitted into the red region, and you have the area of overlap

Or you can get some millimeter paper, draw it and count the squares!

btw. Its actually x32.. my pc sucks... don't let the Zune theme fool ya