Charlie,
Very interested. Please provide some details
Jack Ford

----- Original Message -----
From: "Charlie England" <ceengland@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, November 30, 2004 4:49 PM
Subject: [FlyRotary] Re: New Muffler Design


> Bill Dube wrote:
> <Snip>>
> And from a guy who did pro sound work in a former life: the 3dB drop is
> indeed 1/2 the *power* but is typically just noticeable as a change to
> the average ear. The 10dB decrease is 1/10 the power, but is perceived
> as being 1/2 the sound level by an average ear. (This is worth
> remembering when the stereo sales guy tries to convince you that
> 100watts is twice as good as 50watts.)
>
> Bottom line, if you got a 10dB decrease, your plane should seem 1/2 as
> loud to the listener, an impressive accomplishment.
>
> Way to go Ed!
>
> Charlie
>
> BTW, which weighting are you using? If memory serves, the 'A' weighting
> is an almost worthless measurement for working on protecting your
> hearing. (details if anyone is interested)
>
>
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