Return-Path: Received: from relay04.roc.ny.frontiernet.net ([66.133.131.37] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2899340 for flyrotary@lancaironline.net; Sun, 21 Dec 2003 00:46:09 -0500 Received: (qmail 17895 invoked from network); 21 Dec 2003 05:46:08 -0000 Received: from unknown (HELO frontiernet.net) ([67.50.125.137]) (envelope-sender ) by relay04.roc.ny.frontiernet.net (FrontierMTA 2.3.6) with SMTP for ; 21 Dec 2003 05:46:08 -0000 Message-ID: <3FE5340F.BB216BDB@frontiernet.net> Date: Sat, 20 Dec 2003 23:48:00 -0600 From: Jim Sower X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Emailing: Ed-Klepeis References: Content-Type: multipart/alternative; boundary="------------572D186A4F3F320E5FB97256" --------------572D186A4F3F320E5FB97256 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit I was there too, but I thought it wasn't a valid test since there was a metal "wall" just aft of the outlet, and all sound drummed and echoed off that wall. I have no way of quantifying the effect of that barrier but I intuit that it was substantial, so I have to pretty much ignore that test as far as sound suppression goes. I do like the compact size and shape and hope it works out really well. Waiting for another shoe to drop .... Jim S. kevin lane wrote: > I was there when this prototype was first run at Tracy's. I > didn't have a decibel meter like Paul, but then I didn't need > one, it was very loud and seemed to have no muffling effect. > based on its small size and no innards, it would have been > remarkable if it did have any effect, actually.Kevin Lane > Portland, OR > e-mail-> n3773@comcast.net > web-> http://home.comcast.net/~n3773 > (browse w/ internet explorer) > > Е..also this principle is used to reduce sound > effects in the exhaust outlet nozzle by routing cool > air around the hot center (reduces the ripping noise > quite a bit)ЕЕ..fwiw. So maybe it will work on the > rotaryЕЕ. > > -- Jim Sower Crossville, TN; Chapter 5 Long-EZ N83RT, Velocity N4095T --------------572D186A4F3F320E5FB97256 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit I was there too, but I thought it wasn't a valid test since there was a metal "wall" just aft of the outlet, and all sound drummed and echoed off that wall. I have no way of quantifying the effect of that barrier but I intuit that it was substantial, so I have to pretty much ignore that test as far as sound suppression goes. I do like the compact size and shape and hope it works out really well.
Waiting for another shoe to drop .... Jim S.

kevin lane wrote:

I was there when this prototype was first run at Tracy's. I didn't have a decibel meter like Paul, but then I didn't need one, it was very loud and seemed to have no muffling effect. based on its small size and no innards, it would have been remarkable if it did have any effect, actually.Kevin Lane Portland, OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~n3773
(browse w/ internet explorer)

Е..also this principle is used to reduce sound effects in the exhaust outlet nozzle by routing cool air around the hot center (reduces the ripping noise quite a bit)ЕЕ..fwiw. So maybe it will work on the rotaryЕЕ.

--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T
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