X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 20 Aug 2009 09:28:32 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-banded.atl.sa.earthlink.net ([209.86.89.70] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3818915 for lml@lancaironline.net; Wed, 19 Aug 2009 22:08:51 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.70; envelope-from=rpharis@teamimc.com Received: from [71.116.122.102] (helo=s1) by elasmtp-banded.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1Mdx4b-0002uy-4n for lml@lancaironline.net; Wed, 19 Aug 2009 22:08:17 -0400 X-Original-Message-ID: <005701ca213b$505d2870$2101a8c0@s1> Reply-To: "Rod Pharis" From: "Rod Pharis" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Strength vs. stiffness X-Original-Date: Wed, 19 Aug 2009 19:09:55 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0054_01CA2100.A31AA730" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1933 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1933 X-ELNK-Trace: 1293b74446918d85d780f4a490ca6956abb457f1b4332f520c8bd8dacd57350cce3720eb0df89889350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 71.116.122.102 This is a multi-part message in MIME format. ------=_NextPart_000_0054_01CA2100.A31AA730 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Lynn, Could you sketch on a photo or illustration of the Legacy approximately = where you added the "Reno Race Mod," how many layers and wheather BID or = Uni? I am planning to at least stiffen the roof above the baggage = compartment, and the fuselage between the luggage bulkhead and the = vertical stabilizer with diagonal Uni to increase torsional stiffness. Rod ----- Original Message -----=20 From: farnsworth=20 To: lml@lancaironline.net=20 Sent: Wednesday, August 19, 2009 5:34 PM Subject: [LML] Re: Strength vs. stiffness 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. =20 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. =20 Lynn Farnsworth Super Legacy TSIO-550 Powered Race #44 =20 =20 -------------------------------------------------------------------------= ----- 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 =20 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.=20 =20 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). =20 Steve Colwell Legacy ------=_NextPart_000_0054_01CA2100.A31AA730 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Lynn,
 
Could you sketch on a photo or = illustration of the=20 Legacy approximately where you added the "Reno Race Mod," how many = layers and=20 wheather BID or Uni?  I am planning to at least stiffen the roof = above the=20 baggage compartment, and the fuselage between the luggage = bulkhead and=20 the vertical stabilizer with diagonal Uni to increase torsional=20 stiffness.
 
Rod
----- Original Message -----
From:=20 farnsworth
Sent: Wednesday, August 19, = 2009 5:34=20 PM
Subject: [LML] Re: Strength vs. = stiffness

The aft = fuselage=20 reinforcement that was done on my Legacy was done on the = recommendation of=20 Greg Cole (One of the designers of the Legacy). He directed where and = how much=20 to strengthen the aircraft. He said with that modification the = aircraft is=20 good up to .6 Mach. I have had mine to .56 Mach at FL230. It has been = done on=20 several Super Legacys. I think you can order the =93Reno Race Mod=94 = through=20 Lancair if you tell them at the time you order a Legacy kit. They will = incorporate the mod in the kit when it is=20 manufactured.

 

Our planes = are good,=20 but they do have areas that can be improved and Greg has improved the = Legacy.=20 Even if you don=92t want to race, I have confidence that Greg Cole = knows what he=20 is doing and my Legacy is stronger (safer) because of the race=20 mod.

 

Lynn=20 Farnsworth

Super=20 Legacy

TSIO-550=20 Powered

Race #44=20  

 

From:=20 Lancair Mailing List=20 [mailto:lml@lancaironline.net] On = Behalf Of=20 Steve Colwell
Sent: Wednesday, August 19, = 2009 6:03=20 PM
To:=20 lml@lancaironline.net
Subject: [LML] Strength vs.=20 stiffness

 

I = don=92t pretend=20 to know anything about flutter, strength or stiffness other than you = can get=20 in trouble =93improving=94 the strength of an airframe.  From = what I have=20 read over the years, unless a proven problem exists you might create = one by=20 making changes.  One example is a 6=92 tapered fishing rod that = will=20 support say 25 lbs..  If you clamp it to a table with one foot = hanging=20 over the edge, it will break with a 10 lb. load.   Even I = can=20 understand that example.  All the factors that affect flutter are = way=20 beyond me.

 

Tail = shake is=20 occurring every time a Legacy applies full power for takeoff.  If = you=20 want to see for yourself, watch the tail of a Legacy (or probably most = highly=20 powered prop planes) when the brakes are set and full power is = applied. =20 The tail is moving around A LOT.  Apparently it=92s not a problem = since the=20 high time airframes seem to be doing just fine.  After thousands = of hours=20 maybe our composite airframes will have structural problems (like the = Cessna=20 210

 I=20 understand).

 

Steve=20 Colwell =20 Legacy

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