Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5b3) with ESMTP id 847693 for rob@logan.com; Tue, 07 Aug 2001 09:37:44 -0400 Received: from conn.mc.mpls.visi.com ([208.42.156.2]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Mon, 6 Aug 2001 15:29:06 -0400 Received: from visi.com (178-98.dynamic.visi.com [209.98.178.98]) by conn.mc.mpls.visi.com (Postfix) with ESMTP id 30EEF814B for ; Mon, 6 Aug 2001 14:38:57 -0500 (CDT) Message-ID: <3B6EF245.7207FCAD@visi.com> Date: Mon, 06 Aug 2001 14:38:45 -0500 From: Michael MIME-Version: 1.0 To: lancair.list@olsusa.com Subject: Hot High Flight References: <200108031645.MAA30962621@nslocum.cs.bell-labs.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> I recently took a trip to Tulsa. It was 106, in the shade, and the plane was terribly heat soaked on the black tarmac. the plane is in gray primer. The controls were so hot to touch that flying was difficult. You get the picture. the mac trim servos quit working reproducibly, when it was that hot. Fortunately, as the plane cooled in the climb, so did the panel, and ultimately the trim control returned. FYI, there is a temperature sensitive voltage regulator that is working too hard with several LEDs for aileron, rudder, flap position (50 milliamp) and intermittent use of trim servos (200 ma). the fix, in discussion with Ray Allen, (used to DBA Mac) is to put several voltage regulators and isolate the circuits. I am writing this to illustrate a potential single point failure mode. The trim stuck down in a 230 KIAS descent, and had it been real IFR, a rough running engine, or something like that, it could have been tough. Also, has anyone noticed a big difference in CHT in hotter than normal operations? It was still 38 F at FL 200, and the CHTs were creeping over 400 when they usually run about 375 or so? Why also do the CHT rise so much when going from FL 230 to FL 260 with everything else keep the same? Michael D Smith >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>