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All Springer/NP/PCP Air Gun Discussion General > 3D printing and files

Extended Notos muffler inserts

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subscriber:
Patrick,

There is a cavity between the barrel muzzle and the snout inside the stock outer cannister.  The length of the snout affects how far the pellet has to travel before it is in the relatively "wind-still" "shadow" behind the first air stripper.  The longer snout protects the pellet better from initial turbulence, just after it leaves the barrel, but more air will follow the pellet into the second baffle chamber, and that could make the system louder.  So, the longer and shorter snout versions were experiments to see if there was a clear winner for group size and sound reduction. 

In this instance there is no clear winner.  So, either style would work at stock power level or below.  If you could increase the power by 50 or 100% there might be more of a difference in performance.   As this system seems quiet enough, grouping ability would be the metric for making the choice.   If again, the performance for the long and short snout versions are similar, then that suggests a robust system that is rather forgiving.

psdavidson812:

--- Quote from: subscriber on July 29, 2024, 12:03:49 AM ---Patrick,

There is a cavity between the barrel muzzle and the snout inside the stock outer cannister.  The length of the snout affects how far the pellet has to travel before it is in the relatively "wind-still" "shadow" behind the first air stripper.  The longer snout protects the pellet better from initial turbulence, just after it leaves the barrel, but more air will follow the pellet into the second baffle chamber, and that could make the system louder.  So, the longer and shorter snout versions were experiments to see if there was a clear winner for group size and sound reduction. 

In this instance there is no clear winner.  So, either style would work at stock power level or below.  If you could increase the power by 50 or 100% there might be more of a difference in performance.   As this system seems quiet enough, grouping ability would be the metric for making the choice.   If again, the performance for the long and short snout versions are similar, then that suggests a robust system that is rather forgiving.

--- End quote ---

 Subscriber,
 Thank you for the explanation and all of your hard work.
 I am working on for a HPA airsoft gun and have been look at your design. As impatient as I am, I got my Notos in the mail yesterday and planning on starting the mods this weekend. I have my .2 test print on the printer now and plan on doing a .08 layer later after test fit.

subscriber:
Patrick,

HPA airsoft is likely to be loud due to supersonic projectile velocities.  No moderator can reduce that supersonic crack sound of the projectile.

Also, the plastic balls might not travel straight down the moderator due to a lack of rifling spin, and large projectile OD to barrel ID clearance.  Unless I misunderstood you, there is a potential for the plastic balls to damage the moderator unless you use generous clearance between baffle bores and projectile.

Perhaps you meant BBs?  Lead or steel BBs should shoot straighter than plastic ones from a smooth bore barrel.  Still, you want to keep the velocity below 1050 FPS, as above 1100 to 1150 FPS they will make a loud whip cracking noise.

psdavidson812:

--- Quote from: subscriber on August 02, 2024, 12:20:34 AM ---Patrick,

HPA airsoft is likely to be loud due to supersonic projectile velocities.  No moderator can reduce that supersonic crack sound of the projectile.

Also, the plastic balls might not travel straight down the moderator due to a lack of rifling spin, and large projectile OD to barrel ID clearance.  Unless I misunderstood you, there is a potential for the plastic balls to damage the moderator unless you use generous clearance between baffle bores and projectile.

Perhaps you meant BBs?  Lead or steel BBs should shoot straighter than plastic ones from a smooth bore barrel.  Still, you want to keep the velocity below 1050 FPS, as above 1100 to 1150 FPS they will make a loud whip cracking noise.

--- End quote ---
I got one made for the airsoft. the fps is only 320. and only pushes 100psi. It works good, I used acoustic foam and a baffle design like you used. Do you think this would also work for an airgun. Baffles then a foam core?

subscriber:
Patrick,

The devil is in the details.  I can't comment on a design I have not seen.

Just a head's up, this forum is for airguns shooting pellets, slugs and BBs.  They do not entertain discussions about airsoft guns.  Not unless it is pertinent to airguns shooting pellets, slugs or BBs.

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