X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao107.cox.net ([68.230.241.39] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2093462 for flyrotary@lancaironline.net; Sat, 09 Jun 2007 12:56:17 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao107.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070609165537.UVST12556.fed1rmmtao107.cox.net@fed1rmimpo02.cox.net> for ; Sat, 9 Jun 2007 12:55:37 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id 9Uve1X00B1xAn3c0000000; Sat, 09 Jun 2007 12:55:38 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: Oil temp limit Date: Sat, 9 Jun 2007 09:56:50 -0800 Message-ID: <000001c7aabf$8e1fe980$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C7AA7C.7FFEF370" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C7AA7C.7FFEF370 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I guess we've had this discussion before but to me it still seems like a grey area. =20 The limit has to do with temperature, time, and limiting component.=20 =20 At typical cruise conditions I have coolant temps of 160-170F and oil = temps about 20 degrees higher. Short term climb out (1000 - 2000') I see oil getting up 215 -220 and coolant around 200. If I continue climb, I need = to reduce power to keep them at those levels; which means climb rates of 500-700 FPM with OAT of 65F, and maybe a bit less if OAT is higher. I = don't like being limited to that climb rate when I have power for considerably more; but the real question is: Is that temp level an issue if sustained = for 10-15 minutes? And what is it affecting? =20 I expect to make some modification to improve airflow through the = cooler, just deciding if it is urgent or if it can wait for another 10 -20 hrs = of flying. Anytime I go east from my airport I have to climb from 1400' to about 7000' to clear high terrain. =20 Thanks, =20 Al ------=_NextPart_000_0001_01C7AA7C.7FFEF370 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I guess we’ve had this discussion before but = to me it still seems like a grey area.

The limit has to do with temperature, time, and = limiting component.

At typical cruise conditions I have coolant temps = of 160-170F and oil temps about 20 degrees higher. Short term climb = out (1000 – 2000’) I see oil getting up 215 -220 and coolant around = 200. If I continue climb, I need to reduce power to keep them at those levels; = which means climb rates of 500-700 FPM with OAT of 65F, and maybe a bit less = if OAT is higher. I don’t like being limited to that climb rate = when I have power for considerably more; but the real question is: Is that temp = level an issue if sustained for 10-15 minutes? And what is it = affecting?

I expect to make some modification to improve = airflow through the cooler, just deciding if it is urgent or if it can wait for = another 10 -20 hrs of flying. Anytime I go east from my airport I have to climb = from 1400’ to about 7000’ to clear high = terrain.

Thanks,

Al

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