Europa-List: Re: the Obsidian Files - So Much Noise!!!

[Area-51 <goldsteinindustrial@gmail.com>]

An update on yesterday's recon into an exhaust muffler... spent the day trying
a few different things mods; all that was mostly achieved was a transposition
along the frequency band but not much db reduction... gave up for now and went
back to testing the carbi box... and...

Well as expected 181's stock factory air box did pretty much zip to shut things
up; on average about 3db across the whole range. Then the Mod box got some 
scrutiny.

Mod box rocks... on average around 25db to 40db reduction through the target 
range;
WOT rpm primary frequencies are returning up around 30db and secondary harmonic
ranges are returning around 15db reduction.

Will have to build this Mod box and see if the actuals match!

A 25db noise reduction from the engine will make eating cheese inflight more 
enjoyable
again.


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http://forums.matronics.com/viewtopic.php?p=510554#510554


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