X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao106.cox.net ([68.230.241.40] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2453908 for flyrotary@lancaironline.net; Sat, 03 Nov 2007 12:43:45 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.40; envelope-from=alventures@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao106.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071103164306.TVAH17470.fed1rmmtao106.cox.net@fed1rmimpo03.cox.net> for ; Sat, 3 Nov 2007 12:43:06 -0400 Received: from BigAl ([72.192.143.193]) by fed1rmimpo03.cox.net with bizsmtp id 8Gj31Y0094AaN600000000; Sat, 03 Nov 2007 12:43:05 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: Engine sound Date: Sat, 3 Nov 2007 09:42:59 -0800 Message-ID: <000001c81e40$fbbda870$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C81DFD.ED9A6870" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C81DFD.ED9A6870 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Here's what a 20B with tangential muffler and secondary resonator sounds like. Max rpm in the video is about 3400. http://members.cox.net/alg3/Runclip.wmv Al The sound of the engine, prop and windblast in the cockpit (canopy not on) is unbearable without the hearing protectors I was wearing. Ordering a HushPower II muffler for it this week. No muffler was installed during the video. ------=_NextPart_000_0001_01C81DFD.ED9A6870 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Here’s what a 20B with = tangential muffler and secondary resonator sounds like.  Max rpm in the video = is about 3400.

 

http://members.cox.net/a= lg3/Runclip.wmv

 

Al

 

The sound of the engine, prop and windblast = in the cockpit (canopy not on) is unbearable without the hearing protectors I = was wearing.  Ordering a HushPower II muffler for it this week.  No muffler was installed during the video.

 

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