X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-4.exch003intermedia.net ([207.5.74.111] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTPS id 4210998 for flyrotary@lancaironline.net; Mon, 05 Apr 2010 20:52:03 -0400 Received-SPF: none receiver=logan.com; client-ip=207.5.74.111; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-4.exch003intermedia.net ([207.5.74.111]) with mapi; Mon, 5 Apr 2010 17:51:25 -0700 From: Jeff Whaley To: Rotary motors in aircraft Date: Mon, 5 Apr 2010 17:51:24 -0700 Subject: Flight report Thread-Topic: Flight report Thread-Index: AQHK1SNI32hCowe5RkaFmEKuYLWeog== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E0179448FFEC9EXVMBX0035e_" MIME-Version: 1.0 --_000_C03ABB0A7362B84BB53D544B3C305E0E0179448FFEC9EXVMBX0035e_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Nothing earth shattering but put another 1.4 hours on the 13B homebuilt tod= ay. After flying the 135 hp lycoming recently I was amazed at how quiet it= was compared to the rotary. Having read here about simply reducing the ex= haust pipe after the Hush Power would give moderate noise reduction I had t= o try it. First I installed a 2.5" to 2" reducer and flew for about an hou= r; it seemed a bit quieter but that could have been wishful perception. Th= en I installed a 2" turn-down after the reducer, hoping that deflecting the= exhaust down toward mother earth would give a marked improvement - couldn'= t tell any difference in the noise but monitoring the climb rate and engine= rpm showed no measureable loss in performance. For now it all stays in pl= ace and I'll continue to build time and think about insulation or sound bar= rier for days ahead. Jeff [13B, NA, EC2, RD1-C (14.4 total; 11.2 trouble-free)] This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal= records. Please then delete the original message. Thank you. --_000_C03ABB0A7362B84BB53D544B3C305E0E0179448FFEC9EXVMBX0035e_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Nothing= earth shattering but put another 1.4 hours on the 13B homebuilt today.&nbs= p; After flying the 135 hp lycoming recently I was amazed at how quiet it w= as compared to the rotary.  Having read here about simply reducing the exhaust pipe after the Hush Power would g= ive moderate noise reduction I had to try it.  First I installed a 2.5= " to 2" reducer and flew for about an hour; it seemed a bit quiet= er but that could have been wishful perception.  Then I installed a 2" turn-down after the reducer, hoping that deflec= ting the exhaust down toward mother earth would give a marked improvem= ent - couldn't tell any difference in the noise but monitoring the climb ra= te and engine rpm showed no measureable loss in performance.  For now it all stays in place and I'll continue= to build time and think about insulation or sound barrier for days ahead.<= /div>
Jeff  [13B, NA, EC2, RD1-C (14.4 total; 11.2 troub= le-free)]
 

This message, and the docum= ents attached hereto, is intended only for the addressee and may contain pr= ivileged or confidential information. Any unauthorized disclosure is strict= ly prohibited. If you have received this message in error, please notify us immediately so that we may correct our = internal records. Please then delete the original message. Thank you.
 --_000_C03ABB0A7362B84BB53D544B3C305E0E0179448FFEC9EXVMBX0035e_--