X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmfepo201.cox.net ([68.230.241.146] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4952146 for flyrotary@lancaironline.net; Wed, 20 Apr 2011 11:52:05 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.146; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmfepo201.cox.net (InterMail vM.8.01.04.00 201-2260-137-20101110) with ESMTP id <20110420155132.QTOT16474.fed1rmfepo201.cox.net@fed1rmimpo02.cox.net> for ; Wed, 20 Apr 2011 11:51:32 -0400 Received: from BigAl ([72.199.221.69]) by fed1rmimpo02.cox.net with bizsmtp id ZrrX1g00e1WSgfc04rrXSE; Wed, 20 Apr 2011 11:51:32 -0400 X-CT-Score: NA X-Authority-Analysis: v=1.1 cv=/haqZ/BE8xmPohdEhFtJ7eRSy5lZidy2VEIgPeJNyP4= c=1 sm=1 a=jE5MbdUzLPkA:10 a=G8Uczd0VNMoA:10 a=swDsztNognk9GHlyB/l+AQ==:17 a=Oai1hX8AJ3-ZSZcdGCEA:9 a=CjuIK1q_8ugA:10 a=UZumeyC5M1rHKs7tOBIA:9 a=CCaFY62RKyXlpSLOSPgA:7 a=swDsztNognk9GHlyB/l+AQ==:117 X-CM-Score: 0.00 Authentication-Results: cox.net; none From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] My Mistral Engine Status Date: Wed, 20 Apr 2011 08:51:52 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01CBFF38.31502AE0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6863 In-Reply-To: Importance: Normal Thread-Index: Acv/bYW1npRprjnNTwGmv+7u/FVjEgADGNQg X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6090 This is a multi-part message in MIME format. ------=_NextPart_000_002C_01CBFF38.31502AE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Steve wrote: 3. At 50% power, my fuel flow is 11 GPH rich and 9GPH lean. This doesn't seem right - at 50% power my 20B will run 9-10 gph leaned. The tangential style mufflers are too power-robbing My 20B got 265 hp at 6300 rpm on the dyno with the tangential muffler and secondary resonator. With 9.0 : 1 rotors and normally aspirated that's not all bad. But perhaps more importantly I now have 213 hour on the inconel tangential and 321 SS secondary; and they are still in good condition. And it is reasonably quiet. Al G ------=_NextPart_000_002C_01CBFF38.31502AE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Steve wrote:

 

3.  At 50% power, my fuel flow is 11 GPH = rich and 9GPH lean.

This doesn’t seem right = – at 50% power my 20B will run 9-10 gph leaned.

 

The tangential style mufflers are too power-robbing

My 20B got 265 hp at 6300 rpm on the dyno with the tangential muffler and secondary resonator. With 9.0 : 1 rotors and normally aspirated = that’s not all bad.

But perhaps more importantly I now have 213 hour on the inconel tangential = and 321 SS secondary; and they are still in good condition. And it is reasonably = quiet.

Al = G

 

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