LDCs for PCPs

[mrbulk]

We all appreciate your efforts Donny.

[Bob Pratl]

We all appreciate your efforts Donny.

+5 you bet! Nice testing Donny.

[Rallyshark]

Here's one more minor effort for ya, haha.  A picture of the core!  I didn't completely disassemble it, since the part on the end comes apart too, but that is basically a small section of sound deadening materials.  You can see that the high flow version has 4 gas diodes.  The pictures don't do it justice, and there is a lot more going on in that core than it would appear.  It is built pretty darn solid, and the 3D printed part appears to be fiber re-enforced upon close inspection...  It should be plenty strong for an air gun, but would certainly destroy itself if not used as intended.  It had no problem dealing with the 97fpe .30 fwiw.

As I mentioned previously, I wouldn't normally show this picture, but STO openly discusses the design on the links posted previously.  The discussion also shows the digital representations of the build and principles behind the gas diodes.  I believe they also make the 3D file available to people who purchase their LDCs, provided you don't make it public, of course.  The LDC is designed so the core can be replaced or updated in the future(should improvements be made). 

I gotta say, after looking at the core, there's a lot of coolness going on with this very unique LDC.  I can only imagine how well the larger Sarissa would work.  I bet it could tame some serious air guns for sure.  I still feel safe highly recommending the STO LDCs.  I haven't personally seen another one of this size or price that can do what this one can do.  That's all I got for now, enjoy! 

[Long_Gun_Dallas]

That's pretty wild looking!  And I do think the two hatsans were a pretty good test for it.  I've inevitably ended up setting up a good number of moderators with only a little sound dampening at the tip like that.  Seems to be the most effective there, and anywhere else, additionally, is hardly consequential. 

Thanks again for reporting back, and sharing   I still think the most effective design I have worked with is a reflexed shroud, simple cone baffles forwar, with tight clearances.  And felt in the end.

[mrbulk]

Here's one more minor effort for ya, haha.  A picture of the core!  I didn't completely disassemble it, since the part on the end comes apart too, but that is basically a small section of sound deadening materials.  You can see that the high flow version has 4 gas diodes.  The pictures don't do it justice, and there is a lot more going on in that core than it would appear.  It is built pretty darn solid, and the 3D printed part appears to be fiber re-enforced upon close inspection...  It should be plenty strong for an air gun, but would certainly destroy itself if not used as intended.  It had no problem dealing with the 97fpe .30 fwiw.

As I mentioned previously, I wouldn't normally show this picture, but STO openly discusses the design on the links posted previously.  The discussion also shows the digital representations of the build and principles behind the gas diodes.  I believe they also make the 3D file available to people who purchase their LDCs, provided you don't make it public, of course.  The LDC is designed so the core can be replaced or updated in the future(should improvements be made). 

I gotta say, after looking at the core, there's a lot of coolness going on with this very unique LDC.  I can only imagine how well the larger Sarissa would work.  I bet it could tame some serious air guns for sure.  I still feel safe highly recommending the STO LDCs.  I haven't personally seen another one of this size or price that can do what this one can do.  That's all I got for now, enjoy!

Wow Wow Wow Donny, We're Not Worthy! 

So is that a 3D printed core that just looks "fuzzy"? Or are there indeed fibers of some kind wound around it?

[rkr]

That Falx is actually a rather large unit, 47% bigger than HW. It would be very interesting to compare those 3d printed internals vs. some old fashioned 3 chambers + felt + curlers setup. I've tried that with few silencers and the old school approach was always more quiet, well with the exception of AWT internals + felt which was the quietest.

[Mr.P]

Some point I may do some measurements to back up what I think I'm observing.

I also don't know enough about building these for my experiences to be particularly relevant because I might be making obvious design flaws.

I've tested out maybe 15 to 20 different designs using curlers, 3-D printed guts, and also an all metal one with the vented metal baffle cone cups. 

I'm able to get the quietest by far with the 3-D printed compared to felt curlers and the metal baffles. 

There is a significant "timbre" Difference which is of course not the same as a difference in volume.  In general, 3d printed plastic baffles with no felt or curlers gets the sound the deadest , a kind of "thunk".   My curler / washer baffle tests produced a similar tone but not as quiet. And I got pretty creative with stuffing those curlers and felt in all kinds of combinations.


The metal cup baffles make more of a hiss - higher pitched air flow sound, but quiet enough.

[rkr]

Some point I may do some measurements to back up what I think I'm observing.

I also don't know enough about building these for my experiences to be particularly relevant because I might be making obvious design flaws.

I've tested out maybe 15 to 20 different designs using curlers, 3-D printed guts, and also an all metal one with the vented metal baffle cone cups. 

I'm able to get the quietest by far with the 3-D printed compared to felt curlers and the metal baffles. 

There is a significant "timbre" Difference which is of course not the same as a difference in volume.  In general, 3d printed plastic baffles with no felt or curlers gets the sound the deadest , a kind of "thunk".   My curler / washer baffle tests produced a similar tone but not as quiet. And I got pretty creative with stuffing those curlers and felt in all kinds of combinations.


The metal cup baffles make more of a hiss - higher pitched air flow sound, but quiet enough.

Decibel peak at higher frequency usually sounds like more quiet, even if it measures higher than a peak at low frequency. There comes a point when you need to consider if quiet sounding is better than low dB peak.

[Rallyshark]

Here's one more minor effort for ya, haha.  A picture of the core!  I didn't completely disassemble it, since the part on the end comes apart too, but that is basically a small section of sound deadening materials.  You can see that the high flow version has 4 gas diodes.  The pictures don't do it justice, and there is a lot more going on in that core than it would appear.  It is built pretty darn solid, and the 3D printed part appears to be fiber re-enforced upon close inspection...  It should be plenty strong for an air gun, but would certainly destroy itself if not used as intended.  It had no problem dealing with the 97fpe .30 fwiw.

As I mentioned previously, I wouldn't normally show this picture, but STO openly discusses the design on the links posted previously.  The discussion also shows the digital representations of the build and principles behind the gas diodes.  I believe they also make the 3D file available to people who purchase their LDCs, provided you don't make it public, of course.  The LDC is designed so the core can be replaced or updated in the future(should improvements be made). 

I gotta say, after looking at the core, there's a lot of coolness going on with this very unique LDC.  I can only imagine how well the larger Sarissa would work.  I bet it could tame some serious air guns for sure.  I still feel safe highly recommending the STO LDCs.  I haven't personally seen another one of this size or price that can do what this one can do.  That's all I got for now, enjoy!

Wow Wow Wow Donny, We're Not Worthy! 

So is that a 3D printed core that just looks "fuzzy"? Or are there indeed fibers of some kind wound around it?

It just looks fuzzy, because of the way the light is reflecting off the material. 

That Falx is actually a rather large unit, 47% bigger than HW. It would be very interesting to compare those 3d printed internals vs. some old fashioned 3 chambers + felt + curlers setup. I've tried that with few silencers and the old school approach was always more quiet, well with the exception of AWT internals + felt which was the quietest.

It is hard to tell from the picture, but the outer ridges of the core fit snug enough inside the housing that they appear to act as baffles, on top of the gas diodes in the center of the core.  It is a very unique design, as I mentioned, there's a lot more going on in that core than the picture shows.  Is it the best design out there?  I don't know, but it is a good one.  I still default to the Huma being the best all around, due to the flexibility of adding chamber/deadening sections.  Size aside, you can make the Huma handle almost any job. 

Today, I also tested the STO on a Nova .22 that I tuned to 50 fpe with JSB Monsters.  This isn't my gun, but a friend's that I tuned.  This was bare barrel with no shroud.  It had a Huma Mod40 on it that was the exact same length as the Falx, so a good comparison.  I need to test it outdoors to get a solid opinion, but it seemed to be slightly quieter than the Huma.  It is hard to tell for sure with the bottle ping and the pellet impact in the trap though.  It is, at the very least, as good as the Huma.  I would love to see some frequency readings and db numbers from some proper equipment.  Too bad I have none of that stuff. 

That's pretty wild looking!  And I do think the two hatsans were a pretty good test for it.  I've inevitably ended up setting up a good number of moderators with only a little sound dampening at the tip like that.  Seems to be the most effective there, and anywhere else, additionally, is hardly consequential. 

Thanks again for reporting back, and sharing   I still think the most effective design I have worked with is a reflexed shroud, simple cone baffles forwar, with tight clearances.  And felt in the end.

I think the design with the most volume to deal with the air will almost always win(all other things being equal).  Be it venting into a shroud or a larger LDC.  There's only so much that can be done with a given volume.  You can make a smaller LDC with a lower peak db level, but there will be other noises involved, and likely more sustained ones(delayed whoosh). 

[Mr.P]

I'm generally getting quieter shots with plastic printed cores compared to three chamber / curler ldc in the same volume, and I experimented with the curlers quite a bit

You can make some pretty high surface area things with a 3-D printer and really mess with airflow pretty effectively I think

I just started a 10 hour print to make an airstripper of my own design to go in front of my 3-D printed baffle cores. Basically the air is diverted outward into a series of nested outer cylinders, with the air directed to follow a long path between the cylinders to escape.  It was a challenge to model.  Who Knows if it will be effective but it's fun to try these things out.

Can I post a picture of a 3-D model of an air stripper? Or will I get a warning for that?

[GARY T]

Any updates?