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-   -   Making a "Loudener" louder? (https://www.mcarterbrown.com/forums/ask-experts/35800-making-loudener-louder.html)

himurax13 03-23-2008 01:23 PM

Making a "Loudener" louder?
 
I was at my buddy's machine shop yesterday and after taking a quick look at my "Loudener" setup that he could make it louder by drilling some holes. Does anyone have a suggestions to make this as loud as possible? :drool:
https://i27.tinypic.com/34ja9tf.jpg

HP_Lovecraft 03-23-2008 01:32 PM

The optimal shape is an exponential curve to maximize pressure displacement:

https://www.na.iac.cnr.it/even/Immagini/Tractrix.gif

Walking_Target 03-23-2008 02:02 PM

Haha! HP strikes again!

seriously though, think it through a bit...

a loudener works by directing a pressure wave and causing maximum displacement of atmosphere to create as large a pressure wave as possible.

now, if you drill holes into it, it will cause the pressure displacement to loose effectiveness as you are losing pressure (as with barrel porting...)

CrazyBoy78 03-23-2008 02:57 PM

Put another loudener on it. :D

CamoDeafie 03-23-2008 05:37 PM

or do what i had in mind, make a sealed chamber, that fits over the barrel's porting, preferably the only place with porting, so that theres no exposed porting and put the loudener's bugle horn shape in front of it, that way you can have the extractor and flash hider/bugle. its based on the idea that the air pushed in front of the ball would be diverted into the chamber by the porting, and as the ball passes the chmaber, it creates a vacuum and thus extracts the air behind it, thereby giving slightly more pressure behind the ball, which then exits throught the loudener, possibly making it more of a boom than crack sound, but this is based on the theory of fume extactors used in tank cannons....which all uses MUCH higher presures and velocities and has the projectile basically forced into the rifling, so im not sure if theres a merit to this idea?

Chess13 03-23-2008 06:16 PM

You can always buy a cheap brass trumpet off e-bay for like 20ish cut the end off and attach it over the end of a barrel. Pretty easy to do doesn't take much skill and it will make it nice and loud.

super-cameron 03-23-2008 06:57 PM

Quote:

Originally Posted by Walking_Target (Post 349756)
Haha! HP strikes again!

seriously though, think it through a bit...

a loudener works by directing a pressure wave and causing maximum displacement of atmosphere to create as large a pressure wave as possible.

now, if you drill holes into it, it will cause the pressure displacement to loose effectiveness as you are losing pressure (as with barrel porting...)

Exactly. That's why a "quiet barrel" usually has lots of holes (porting) to help displace the noise. Make sure the barrel it goes on is solid with NO porting. Also, shorter barrels tend to work better.

LK-13 03-23-2008 07:12 PM

and experiment that may help is to take a length of pipe of the diameter you believe that you will be making your loudner,
then make a disk that will fit your barrel and seal off the end of the pipe.
now slide the pipe back and fourth while shooting, kind of trombone like,
you will hear the report of your marker change.
when you find the sound signature your looking for,
mark the pipe accordingly,
and have your actual loudner made to these dimensions.
this will give you the best BANG for your buck.

it's all about sound focusing in a resonating column.
much like a tubular bell or a drum.

SCPaint 03-23-2008 10:06 PM

Quote:

Originally Posted by Chess13 (Post 349885)
You can always buy a cheap brass trumpet off e-bay for like 20ish cut the end off and attach it over the end of a barrel. Pretty easy to do doesn't take much skill and it will make it nice and loud.

and we want pics too!:thumbup:

super-cameron 03-24-2008 07:25 AM

Sweet! It would look like a musket!


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