X-Virus-Scanned: clean according to Sophos on Logan.com From: "Jeff Whaley" Received: from hub026-NJ-7.exch026.serverdata.net ([206.225.166.170] verified) by logan.com (CommuniGate Pro SMTP 6.2c3) with ESMTPS id 9736585 for flyrotary@lancaironline.net; Tue, 09 May 2017 11:44:35 -0400 Received-SPF: none receiver=logan.com; client-ip=206.225.166.170; envelope-from=jwhaley@datacast.com Received: from MBX026-E1-NJ-2.exch026.domain.local ([10.240.14.52]) by HUB026-NJ-7.exch026.domain.local ([10.240.14.233]) with mapi id 14.03.0319.002; Tue, 9 May 2017 08:44:15 -0700 To: Rotary motors in aircraft Subject: RE: F/A and EGT data Thread-Topic: F/A and EGT data Thread-Index: AQHSyNscOGSyHn7d8UaTCw67Ou5Iaw== Date: Tue, 9 May 2017 15:44:14 +0000 Message-ID: <234B758DE9A64449BEB6BB5D1345CA7A48F81380@mbx026-e1-nj-2.exch026.domain.local> References: In-Reply-To: Accept-Language: en-CA, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [209.87.232.162] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 From memory, reading the EC2 Manual it states that rotor balancing should b= e performed at your preferred cruise rpm as it will remain balanced over a = very narrow range. I'm sure you know: Static and in-flight engine performan= ce will not be the same, regardless if the RPMs and MPs are matched. Jeff From: Bobby J. Hughes Subject: F/A and EGT data Date: Tue, 9 May 2017 10:12:07 -0500 To: Rotary motors in aircraft I recently purchased a two channel portable wideband O2 system and install= ed bungs and plugs on each exhaust runner. I also have a downstream wideban= d that I have been using for several years. I was able to spend a very prod= uctive hour ground tuning and adjusting Mode 4 injector balance prior to my= flight yesterday from Austin to Akron OH. I'm not sure what to make of the= F/A EGT spread data I collect during yesterday's flight. During the ground tuning session I balanced rotor 1 to match rotor 2 using = F/A ratios for takeoff condition. This produced very close EGT readings. Ho= wever at my preferred cruise settings I'm seeing a large EGT spread. I woul= d expect a consistent EGT ratio change when adjusting the mixture knob at a= steady rpm / MP. This appears not to be the case. What am I missing? Bobby Hughes 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.