Return-Path: Received: from mtiwmhc03.worldnet.att.net ([204.127.131.38]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Sat, 17 Jul 1999 02:08:47 -0400 Received: from bigfoot.com ([12.72.4.183]) by mtiwmhc03.worldnet.att.net (InterMail v03.02.07.07 118-134) with ESMTP id <19990717061202.BCXK4954@bigfoot.com> for ; Sat, 17 Jul 1999 06:12:02 +0000 Message-ID: <37901EE8.4533606D@bigfoot.com> Date: Fri, 16 Jul 1999 23:12:56 -0700 From: Bob B To: lancair.list@olsusa.com Subject: Lancair's new CG recommendation References: <19990717044925.AAA1429@truman.olsusa.com> X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> In the 1st Quarter 1999 edition of the Lancair mail, there is a small paragraph which concludes that the forward CG could be moved to 11% of MAC without any problems. The 235 and 320 both had the same range specified in the builder's manual, 15% to 29% MAC, or FS 24.5 to FS 30.3. Getting out my trusty calculator, I find that changing from 15% to 11% MAC amounts to a change of 1.66 inches, so this moves the forward limit from 24.5 inches to 22.8 inches. Since I changed my engine to a IO 320 I have been operating with the CG about 1 inch forward of the published limit (with full header tank and empty wings) and have noticed no problems except the range of the standard trim setup is barely enough. That is, at cruise the trim is nearly full forward, and on landing it is all the way back. It is a relief to find that I am, in fact, operating within the recommend limits. By the way, the maximum AFT CG that I can achieve is 28.8 inches, with wing tanks full, two people, 50 lb. baggage, and only 3 gal in the header. Bob Belshe N19BJ 235/320 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML homepage: http://www.olsusa.com/Users/Mkaye/maillist.html