LDCs for PCPs

[mrbulk]

Hey Mister, we're just talking about fuel filters, aren't we? Hehe...

Donny I just need to figure out The Way to test. Indoors everything overwhelms my sound meter, and outdoors I gotta time it between nosy neighbor head poke-outs...especially when doing the no-LDC comparo shots...

I'm not looking for sound meter readings really.  I'm just looking for your thoughts on how well it seems to work on your guns is all.  Just your "seat of the pants" thoughts on it, if that makes sense.  I'm really curious to see how it compares to the Sumo, because I had a Sumo once and sold it.  It just didn't do what I hoped it would do, but the Huma blows it away from my memory.  That's isn't necessarily a knock on the Sumo, but it just didn't work well for me.

Yeah Donny, the ear test oughta be easy enough to do. Will LYK my "official aural findings" (*ahem*) in a day or two...

[rkr]

Just got a 3d printer up and running. Also a couple of 10" x 2" Chinese "fuel filter" tubes/caps/orings / filters sets, again only $16 a pop...

So I have been printing different baffles to try out in those tubes along with hair curlers and other home made stuff.

Getting some very good results but it's all just random messing around and having fun, not getting really systematic.

These would be great for anyone wanting a 2" can. 

Am I crossing a line here?  Is this general and vague enough? 

Thanks, I didn't know they make those filters in such big size. Not much point in doing one myself when you can get them ready made for that price. As for internals, a copy of HW setup will work perfectly for 2" tube - makes 160 fpe almost whisper quiet. Worth noting that plastic parts may start to disintegrate when you go past 45 fpe (been there done that). Even 2mm soft aluminium plate starts changing shape at 200+ fpe - funnel shaped baffles anyone?

[Long_Gun_Dallas]

Well, I originally got a Standard+, which is the same as yours, but with an extra 20mm section.  At the time, I was fighting some accuracy issues with a gun, and I stupidly drilled it out    Now it has the opening of about a .30 cal,lol.  I later added a 40mm section for a .25 to it.  In other words, a standard that isn't drilled out would probably work about as well as mine currently does.  It works amazingly well, considering the size of the hole on it and I'm using it on a .22 tuned to around 57 fpe.  It is actually still easily backyard friendly.  The odds of clipping are extremely low though,haha.  I'm just kicking myself for drilling it out...  I sure wish I could buy the end cap for them by itself.  I'll probably end up getting another Standard at some point.

If you ask them, they will just sell you an end cap.   They will at minimum try their very hardest to.  I got one myself, it was from old stock, or had a mismatched (ever so slightly) anodized coat.  But they told me that before selling it to me.  I'm telling yall, their customer service has been above top notch.  In more than a few instances.

[Wayne52]

I've got two of these and they both work fantastic, one is on my Prod and the other is on my Benjamin Cayden.  It's always a treat to have a nice quiet gun when hunting so you don't give the critters as much of an idea as to where the sound is coming from especially for a miss, it's the difference between being able to make a second shot if need be.

[mrbulk]

I've got two of these and they both work fantastic, one is on my Prod and the other is on my Benjamin Cayden.  It's always a treat to have a nice quiet gun when hunting so you don't give the critters as much of an idea as to where the sound is coming from especially for a miss, it's the difference between being able to make a second shot if need be.

Rocker1 ... jumbo?

[Wayne52]

David made one of these for me when I exploded a TKO LDC after installing an SS valve in it, he did a high FPE test with it before sending it to me, that carbon fiber is some tough stuff.

[Warburrito]

Has anyone else read through the LDC reviews done by Silent Thunder Ordinance?  I feel like his analysis was really helpful in comparing similar products out there, but since he sells his own LDCs it does make me wonder if someone else would be a better candidate for comparing these products.  I think it would be awesome if someone out there had the knowledge to operate an unbiased website performing the same sorts of analysis for any products users sent them to test.  I think our community would find value in that.

I'd consider doing it myself, but I admit that I have already been designing and creating my own LDCs for my personal airguns for a while since I want them ultra backyard friendly.  I've thought about selling them as well at some point in the future, so I don't think I'd be the best candidate for this since I'd likely have some level of bias.

Does anyone know of someone else who has this kind of research out there?  Or is anyone up for testing and compiling information like this?

https://www.silentthunderordnance.com/blog/2019/3/1/airgun-moderator-design-performance-and-development-the-big-test-part-5

[rkr]

Has anyone else read through the LDC reviews done by Silent Thunder Ordinance?  I feel like his analysis was really helpful in comparing similar products out there, but since he sells his own LDCs it does make me wonder if someone else would be a better candidate for comparing these products.  I think it would be awesome if someone out there had the knowledge to operate an unbiased website performing the same sorts of analysis for any products users sent them to test.  I think our community would find value in that.

I'd consider doing it myself, but I admit that I have already been designing and creating my own LDCs for my personal airguns for a while since I want them ultra backyard friendly.  I've thought about selling them as well at some point in the future, so I don't think I'd be the best candidate for this since I'd likely have some level of bias.

Does anyone know of someone else who has this kind of research out there?  Or is anyone up for testing and compiling information like this?

https://www.silentthunderordnance.com/blog/2019/3/1/airgun-moderator-design-performance-and-development-the-big-test-part-5

They could certainly do better job in analyzing those results. A simple graph with dB level and frequency and line for every silencer they tested, like the one I posted. The biggest problem is getting all the needed silencers to someone who could then test them properly at one go to keep environmental variables out. To circumvent that I use a standard silencer (HW) and test other silencers and modifications against that.

[Hangtown-Shooter]

Look what I just found out on my porch...  this thing must be so dang quiet I didn’t even realize it got delivered 

Thanks Neil! She’s a beauty 

[mrbulk]

Look what I just found out on my porch...  this thing must be so dang quiet I didn’t even realize it got delivered 

Thanks Neil! She’s a beauty 

WHOA, she’s a stealth beaut. Hey how quick was the shipping? From order to today?

[Hangtown-Shooter]

Ordered Friday afternoon, received the following Wednesday... custom made by hand one at a time per each order... pretty dang fast! 

[JohnnyPDX]

... this thing must be so dang quiet I didn’t even realize it got delivered 

That is funny, Thanks.

[mrbulk]

Real world test - I know there are numerous scientific measurements and criteria regarding sound output, as well as various scholarly interpretations of those same measurements, etc. but I also realized my neighbors were not huddled around their decibel meters nor consulting their scientific sound decibel journals trying to see if my guns were too loud or not.

In fact they likely didn't even know I was shooting unless they heard it loud enough. And that's usually when they start poking their heads out their windows or doors.

So I figured I would just do a simple real world test, where I place the sound meter 10 feet in front and slightly to the side of the muzzle of my test gun today, which in this case was a Kral NP-03 that just came in. It has a power adjustment dial like on my Akela, and I had it set at 3/4 of the way up toward full power.

The shooting lane I set up is flanked on one side by a long brick wall and the other, the house itself with cement stucco finish which hopefully provided for similar sound reflection patterns from either side. All shots made from same benched position shown in photos, at a target 75 feet away (barely visible at top left of long photo shot). Target was rubber mulch filled and made no detectable noise from back where I was.

I used JSB 18.13gr pellets for each shot traveling at an average of 750 fps.

My left side neighbor's A/C unit behind that wall was running the whole time (it was 104 degrees out) so no other ambient noises (if any) were obvious nor picked up by the sound meter, which also meant there were no other variations in detectable ambient sound levels due to the A/C's continual background noise. All in all the testing conditions for each LDC were as equivalent as I could make them.

I did not test for POI shift or accuracy or fps, just what decibel level of sound a neighbor might hear if they were just standing around outside.

Several of the LDCs were not testable (they either had proprietary threads or I had no proper adapter for the Kral, etc.) so here are the six that I Could test, in order of loudness, average db of three shots each:

Bare barrel 107.0 db (one shot only, too LOUD!)

ZeroDB        97.7 db

Geo ebay     97.6 db

Rocker1       93.2 db

Sumo          85.8 db

Tanto          85.5 db

HUMA         80.5 db

To be honest most of the LDCs sounded about the same to my ear (of course I was sitting right next to the gun as it was fired) and yet - the Huma was OBVIOUSLY quieter. Even from where I was sitting (yes Donny, you may have been right about the Huma all along)...and funny how the Tanto was actually quieter than its Sumo big brother.

So that's that. And that's all I have, interpret this as you will!

I will do more of this whenever I can afford to acquire more LDCs, since I purchase mine with personal funds to quell any perceptions of, or allusions to any favoritism towards donated products.

[Rallyshark]

Very interesting!  I've seen the same result echoed with the Tanto and Sumo on other tests too.  I would have expected the 0db to do better.  Which version was it, the shorter one?  You should have pulled one of the sections off the Huma to see how it faired being a more similar length to the others, heck take two sections off, you know for science   I suspect the results might move around, if you turn that gun up to full power?  Thanks for posting!

[mrbulk]

Donny it was the shorter 110 Model. They did not offer the 160 when I was buying.

[Rallyshark]

Donny it was the shorter 110 Model. They did not offer the 160 when I was buying.

I figured it was the 110.  Not that I'm saying the 160 would win, but I think it would do better.  That 160 is $$$ though.  I still think the Huma will do very well with one of the sections removed still.  I'm just glad it did well in your testing, or I would have felt bad after urging you to get one,lol. 

[mrbulk]

Naw, I'm glad I got it Donny. I really like the "adjustability" and will try that tomorrow.

And I would sure like to get a Neil C.

and Huggett

and Weihrauch (the Euro "standard" as they say)

to check them out side by side.

When I win the lottery 

(I wonder who we know in Europe could send us a Weihrauch? I heard they were like "fifty quid" whatever that comes to which we could send to them, sounds cheap enough)...

[rkr]

Naw, I'm glad I got it Donny. I really like the "adjustability" and will try that tomorrow.

And I would sure like to get a Neil C.

and Huggett

and Weihrauch (the Euro "standard" as they say)

to check them out side by side.

When I win the lottery 

(I wonder who we know in Europe could send us a Weihrauch? I heard they were like "fifty quid" whatever that comes to which we could send to them, sounds cheap enough)...

Add Hogan and A&M Marksman to the list and you are well covered

[JungleShooter]

I will be in Germany next Summer.
If you can wait till then, I can put a shipment together. 👍🏼

Matthias

[mrbulk]

Naw, I'm glad I got it Donny. I really like the "adjustability" and will try that tomorrow.

And I would sure like to get a Neil C.

and Huggett

and Weihrauch (the Euro "standard" as they say)

to check them out side by side.

When I win the lottery 

(I wonder who we know in Europe could send us a Weihrauch? I heard they were like "fifty quid" whatever that comes to which we could send to them, sounds cheap enough)...

Add Hogan and A&M Marksman to the list and you are well covered

Can you send them to me for test? 

But seriously, what about sourcing a Weirauch for me, or just the e-mail/phone of a willing shop?