Hi Bill,
I have never seen an effective muffler used on AC built in the US.
Propeller tip noise is one of the big problems. Most noise reduction comes
from using thicker windshields and side windows, and firewall and side panel
sound insulation, but all of these things add weight, which is not popular
to a company selling carrying capacity.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Sue Pearce" <bs.pearce@xxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Sunday, May 16, 2010 11:28 AM
Subject: Re: [OM] OT: Noise levels in light aircraft, was More eruptions
> Eh? What you say?
>
> What are the powerplants on these aircraft?
>
> When my father was alive, one of the projects he worked on was noise
> attenuation for light aircraft (Cessna 172, Piper equivilent). It involved
> extending the exhaust quite a ways under the fuselage, and fabricating a
> muffler, which had a lot more engineering involved in the design than a
> car
> muffler. Alas, after mcuh work, it was deemed a wasted effort, as not
> sufficiently effective.
>
> Good luck.
>
> Bill Pearce
>
> --
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