X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 19 Aug 2009 20:34:09 -0400 Message-ID: X-Original-Return-Path: Received: from mta31.charter.net ([216.33.127.82] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3818728 for lml@lancaironline.net; Wed, 19 Aug 2009 19:04:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.82; envelope-from=farnsworth@charter.net Received: from imp09 ([10.20.200.9]) by mta31.charter.net (InterMail vM.7.09.01.00 201-2219-108-20080618) with ESMTP id <20090819230345.HOHN3051.mta31.charter.net@imp09> for ; Wed, 19 Aug 2009 19:03:45 -0400 Received: from Farnsworth ([75.139.158.86]) by imp09 with smtp.charter.net id WP3l1c0041s7vFP05P3lVx; Wed, 19 Aug 2009 19:03:45 -0400 X-Authority-Analysis: v=1.0 c=1 a=Ia-xEzejAAAA:8 a=uCV6SDOfQdKgr_luAR8A:9 a=TDshp8HL6133HqcI3sAA:7 a=oQh2oD3IVDfoa-Rjxmf7335G61IA:4 a=EzXvWhQp4_cA:10 a=SSmOFEACAAAA:8 a=yMhMjlubAAAA:8 a=MuH66XlJe1XUriv1jwwA:9 a=gI73QVz9ko-P-X55SLYA:7 a=Xq1gWUlwK1Qud9GcDLivfQNDjw0A:4 From: "farnsworth" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Strength vs. stiffness X-Original-Date: Wed, 19 Aug 2009 19:03:53 -0400 X-Original-Message-ID: <3578E47146944899ADA4A413AE49BB1B@Farnsworth> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02DA_01CA20FF.CB84D570" X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 In-Reply-To: thread-index: AcohGOlETgrOmZTERoev+sbV9bXZiwABhSAw This is a multi-part message in MIME format. ------=_NextPart_000_02DA_01CA20FF.CB84D570 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit The aft fuselage reinforcement that was done on my Legacy was done on the recommendation of Greg Cole (One of the designers of the Legacy). He directed where and how much to strengthen the aircraft. He said with that modification the aircraft is good up to .6 Mach. I have had mine to .56 Mach at FL230. It has been done on several Super Legacys. I think you can order the "Reno Race Mod" through Lancair if you tell them at the time you order a Legacy kit. They will incorporate the mod in the kit when it is manufactured. Our planes are good, but they do have areas that can be improved and Greg has improved the Legacy. Even if you don't want to race, I have confidence that Greg Cole knows what he is doing and my Legacy is stronger (safer) because of the race mod. Lynn Farnsworth Super Legacy TSIO-550 Powered Race #44 _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Steve Colwell Sent: Wednesday, August 19, 2009 6:03 PM To: lml@lancaironline.net Subject: [LML] Strength vs. stiffness 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_02DA_01CA20FF.CB84D570 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

The aft fuselage reinforcement that = was done on my Legacy was done on the recommendation of Greg Cole (One of = the designers of the Legacy). He directed where and how much to strengthen = the aircraft. He said with that modification the aircraft is good up to .6 = Mach. I have had mine to .56 Mach at FL230. It has been done on several Super = Legacys. I think you can order the “Reno Race Mod” through Lancair if = you tell them at the time you order a Legacy kit. They will incorporate the = mod in the kit when it is manufactured.

 

Our planes are good, but they do = have areas that can be improved and Greg has improved the Legacy. Even if you = don’t want to race, I have confidence that Greg Cole knows what he is doing = and my Legacy is stronger (safer) because of the race = mod.

 

Lynn = Farnsworth

Super = Legacy

TSIO-550 = Powered

Race #44 =  

 

From: = Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of Steve Colwell
Sent: Wednesday, August = 19, 2009 6:03 PM
To: = lml@lancaironline.net
Subject: [LML] Strength = vs. stiffness

 

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.

 <= /o:p>

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).

 <= /o:p>

Steve = Colwell  Legacy

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