X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 19 Aug 2009 18:03:25 -0400 Message-ID: X-Original-Return-Path: Received: from n16a.bullet.mail.mud.yahoo.com ([68.142.207.126] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with SMTP id 3818344 for lml@lancaironline.net; Wed, 19 Aug 2009 13:36:38 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.207.126; envelope-from=mcmess1919@yahoo.com Received: from [68.142.194.243] by n16.bullet.mail.mud.yahoo.com with NNFMP; 19 Aug 2009 17:35:59 -0000 Received: from [68.142.201.241] by t1.bullet.mud.yahoo.com with NNFMP; 19 Aug 2009 17:35:59 -0000 Received: from [127.0.0.1] by omp402.mail.mud.yahoo.com with NNFMP; 19 Aug 2009 17:35:59 -0000 X-Yahoo-Newman-Id: 154412.44216.bm@omp402.mail.mud.yahoo.com Received: (qmail 29180 invoked from network); 19 Aug 2009 17:35:58 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:References:In-Reply-To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language; b=WdfR80k0LZMqzsugEcd08Av2qR/RuBNsNA/FD2tTDdbX2ShIzyEM0t6szsvS+fP4aa5lUmaDOtJFCn68e2ygmZ6a7lbWhCAIiyTbl9R/IcPepV9GdA6E0ASyKADI7Qgr/i7cVEPv5o7hnVBsUW0zF1yQlj7MKAYVDQth94yX11U= ; Received: from unknown (HELO Laptop) (mcmess1919@67.161.162.21 with login) by smtp113.plus.mail.sp1.yahoo.com with SMTP; 19 Aug 2009 17:35:58 -0000 X-Yahoo-SMTP: BONaR8OswBCRjuxVhL1OH.1rmXpu5MU- X-YMail-OSG: QWSuDzgVM1mcjztL1tz4gRjyrOaXAPSWifzNqc2CNxAOoRK1kepFKnBSO5rTx5m5gopBjJERsQEUCGPkP.AQ1T1_UVUJ4S.buh9_G4LPx1zThe7OASpSVrutsnQF5JyLEqsPjiQgvdXNx1JRgssIA2NEXBEJsfGIW_ekMZH7kh7jXvC4oftOzLuGgIjSN69CxIDIy2.yCmAClgg- X-Yahoo-Newman-Property: ymail-3 From: "Steve Colwell" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: Strength vs. stiffness X-Original-Date: Wed, 19 Aug 2009 10:35:59 -0700 X-Original-Message-ID: <002801ca20f3$83d497d0$8b7dc770$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0029_01CA20B8.D775BFD0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcoguAMBNv0RXyxASIGZAX53jO4ArAAOBggA Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_0029_01CA20B8.D775BFD0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I don't pretend to know anything about flutter, strength or stiffness other than you can get in trouble "improving" the strength of an airframe. From what I have read over the years, unless a proven problem exists you might create one by making changes. One example is a 6' tapered fishing rod that will support say 25 lbs.. If you clamp it to a table with one foot hanging over the edge, it will break with a 10 lb. load. Even I can understand that example. All the factors that affect flutter are way beyond me. Tail shake is occurring every time a Legacy applies full power for takeoff. If you want to see for yourself, watch the tail of a Legacy (or probably most highly powered prop planes) when the brakes are set and full power is applied. The tail is moving around A LOT. Apparently it's not a problem since the high time airframes seem to be doing just fine. After thousands of hours maybe our composite airframes will have structural problems (like the Cessna 210 I understand). Steve Colwell Legacy ------=_NextPart_000_0029_01CA20B8.D775BFD0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I don’t pretend to know anything about flutter, = strength or stiffness other than you can get in trouble “improving” = the strength of an airframe. From what I have read over the years, = unless a proven problem exists you might create one by making changes. One example = is a 6’ tapered fishing rod that will support say 25 lbs.. If you clamp it = to a table with one foot hanging over the edge, it will break with a 10 lb. = load. Even I can understand that example. All the factors that = affect flutter are way beyond me.

Tail shake is occurring every time a Legacy applies full = power for takeoff. If you want to see for yourself, watch the tail of a = Legacy (or probably most highly powered prop planes) when the brakes are set = and full power is applied. The tail is moving around A LOT. = Apparently it’s not a problem since the high time airframes seem to be doing just fine. = After thousands of hours maybe our composite airframes will have structural = problems (like the Cessna 210

I understand).

Steve Colwell Legacy

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