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Date: Thu, 12 Jan 2006 10:39:30 -0700
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Cool Tube Muffler Sound Readings
Message-Id: <20060112103930.512db283.rlwhite@comcast.net>
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On Thu, 12 Jan 2006 10:33:55 -0600
"Russell Duffy" <russell.duffy@gmail.com> wrote:

> I would like to take some readings from a certified engine for
> comparison.   I measured 104db at 3000 & 4000 rpm from my spiral flow
> muffler. 
> 
>  
> I'd bet the average Lycoming would make a lot more noise at 3000-4000 rpm
> :-)
>  
> Rusty (free from in-laws until Monday)
> 

That does raise an interesting question though.  At what rpm should I
run a Lycoming to compare to the rotary at 3000?  For the same prop
speed, it should be a little over 1000.  It seems that WOT static should
be a fair comparison point for both engines.  Then how much does the
prop affect the results?

Bob W.


-- 
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