Return-Path: Received: from wind.imbris.com ([216.18.130.7]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Tue, 12 Sep 2000 22:06:39 -0400 Received: from regandesigns.com (nortel131-63.imbris.com [216.18.131.63]) by wind.imbris.com (8.9.3/8.9.3) with ESMTP id TAA10430; Tue, 12 Sep 2000 19:12:57 -0700 (PDT) Message-ID: <39BEC68F.B60943B2@regandesigns.com> Date: Tue, 12 Sep 2000 19:13:03 -0500 From: Brent Regan To: Lancair List , edechazal@molex.com Subject: RE: First Flight of N361DC X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Ed, congratulations on your first flight and sorry to hear about the difficulties you are having. Here are my thoughts on the problems. The prop speed problem is definitely related to the low flow from the governor. In a Lycoming, the prop oil passes through a slip ring area in the front main bearing. There is no seal, so oil is free to flow along the bearing. The governor has it's own gear pump that boosts the engine oil pressure to 200-300 PSI. If the pump isn't flowing enough then it can't make enough pressure (due to the leakage flow across the bearing) to actuate the propeller. MT propellers typically require higher pressures than Hartzel or McCauley to actuate. This is particularly true when everything is new and stiff. Do not fly the airplane until you have installed a governor that has adequate flow!!! When the oil gets hot you may loose control of the propeller. I have a spare 2700 RPM governor for my plane (Lycoming 540) that I could lend you if you are in a bind. On the topic of the fuel control unit, have you checked to be sure there isn't an air leak between the servo body and the intakes? Perhaps an open manifold pressure port on one of the heads or a missing gasket? An air leak would cause the fuel servo to "think" less air is flowing into the engine than actually is, causing the mixture to be excessively lean at idle. This would also explain why everything seems to be fine at high (flight) power settings. Good luck! Regards Brent Regan >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>