X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from aspensprings.uwyo.edu ([129.72.10.32] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTPS id 3841752 for flyrotary@lancaironline.net; Tue, 08 Sep 2009 18:50:55 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht1.uwyo.edu (ponyexpress-ht1.uwyo.edu [10.84.60.208]) by aspensprings.uwyo.edu (8.14.2/8.14.2) with ESMTP id n88Mnahi007117 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NO) for ; Tue, 8 Sep 2009 16:50:19 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from Boesexps (172.26.4.5) by uwmail.uwyo.edu (10.84.60.198) with Microsoft SMTP Server id 8.1.393.1; Tue, 8 Sep 2009 16:47:38 -0600 From: sboese To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: At long last, Second Flight Date: Tue, 8 Sep 2009 16:46:29 -0600 Message-ID: <687228086C3648F6AB7DA868297DAABD@gg.uwyo.edu> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 In-Reply-To: Congratulations Tracy on the two safe flights so far. I think we all = have a vested interested in your keeping the flights this way. My 13B is harder to start turning and keep turning with the prop when it = is warm compared to cold. This is felt when compression isn't adding to = the load. The additional load due to compression seems more with the cold engine compared to when it is hot. In other words, the coefficients of static and dynamic friction increase when my engine is hot while the compression load seems to decrease. My experience is limited to just my = one engine. Steve Boese =20