Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5b5) with ESMTP id 924319 for rob@logan.com; Wed, 17 Oct 2001 18:37:14 -0400 Received: from FIRE.PHYS.CMU.EDU ([128.2.26.129]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Wed, 17 Oct 2001 08:17:19 -0400 Received: from fire.phys.cmu.edu (localhost [127.0.0.1]) by localhost (8.12.0.Beta10/8.12.0.Beta10/Debian 8.12.0.Beta10) with ESMTP id f9HCTNZh023026 for ; Wed, 17 Oct 2001 08:29:23 -0400 Received: from localhost (jbp@localhost) by fire.phys.cmu.edu (8.12.0.Beta10/8.12.0.Beta10/Debian 8.12.0.Beta10) with ESMTP id f9HCTNGS023022 for ; Wed, 17 Oct 2001 08:29:23 -0400 Date: Wed, 17 Oct 2001 08:29:23 -0400 (EDT) From: Jeffery Peterson To: Lancair Subject: 360 pitch trim. In-Reply-To: <20011017051216.AAA19787@pop3.olsusa.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> > I have too much sensitivity in my pitch trim. Way too much. I thought I ... > I am thinking the tab is too big. What > thinks the rest of the list??? > > Thanks, > > Matt I am about to cut out my trim tab so I am very interested in this issue. At first you might think "more is better" when it come to trim tabs. But a too-large trim tab can be dangerous. In previous discusions on LNC2 trim I remember that one pilot was worried about run away electric trim. One open wire would put you in the failure mode in which you could trim one way then not be able to remove that trim. A confused pilot trying to figure out the failure might repeatedly try each direction, getting himself deeper in trouble every time. I recall a commment that dialing in full trim, the stick force needed to counteract that trim was more than the pilot could muster. This strikes me as very bad indeed, and if true it would indicate that the tab, (or its angle limit range) really is too big. The trim tab size and range should be set so that at the either limit the stick force need continue flight, then to descend, then flair should be fairly easy to hold for the time needed to land. say 1/2 hour. how much force is that? 10 lb? What are the stick forces at full trim? is the full range needed to trim for both cruise and landing approach? -Jeff Peterson LNC2 80% >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 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. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>