X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 31 May 2013 16:14:29 -0400 Message-ID: X-Original-Return-Path: Received: from nm33-vm6.bullet.mail.ne1.yahoo.com ([98.138.229.70] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6300587 for lml@lancaironline.net; Fri, 31 May 2013 14:07:52 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.229.70; envelope-from=flycassutts@yahoo.com Received: from [98.138.90.49] by nm33.bullet.mail.ne1.yahoo.com with NNFMP; 31 May 2013 18:07:17 -0000 Received: from [98.138.226.126] by tm2.bullet.mail.ne1.yahoo.com with NNFMP; 31 May 2013 18:07:17 -0000 Received: from [127.0.0.1] by smtp205.mail.ne1.yahoo.com with NNFMP; 31 May 2013 18:07:17 -0000 X-Yahoo-Newman-Id: 941061.56753.bm@smtp205.mail.ne1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: od7j87QVM1kCU.qaZLrzqNUfMPkNvUakHJr5hiLk8.7qau0 RI_x2zZYEgSvOuxgnvpo3UJVQkk9izCsO2LpB7s68jpGoMAtS7ynRBl8ngd. gKQ0LdylWIpn7iQmNy99LcTzUd3YWaQJZYqBiobLueASPYnnTnFwiGYhIEMl cfU8bPweWCAhNi9Rip0ztaAUh_F8YPOR82hFgDPU8.v9QpQnAvfE8JcS2_7E Kulc8qQZET.bUnoaDghgMdlcS6R7PiX5GpRlCciBfGJKkB_yxqrSpb6rLF8G XUXQ1xFjwENWtICiOQlzH3OoBENi1XbV9sI4yzdYD41lCsA6JhDFLBeends2 sfJqA7nRIlLvLnP_4T05sTz6p_cTxSmDK5isbooGV_hSgVxZU5lprIAFFLHB Li41dusAeiBrkRi.34dqX7aJ5BP83onrKeBOsyCaUHe8keoG3IzXAbvPgrFg QnVTDxwJTXx0pBdyspcRhAHTaesAvsBpGuIMSwQdWAUNYoOhm_JbahBn.hp3 VNPNiflDZYc50rwOHm5.cPXUIdLaxaZs0P1p_lz402hEQasxtJc5335VlEpQ sIKviLIpnHdO_z1D1bt.QBoc7TODu24d33BDQDcOqANCYy0gct.nZmOFciRG YSVlN2oKIfQDH96NNQzHTj.ar_2szxomIn8k58AL4t9lB4RDRRvE68wlTV29 noBuscbpbYx5DR7JvMaERQd0XoEdLImj3RDmHTuK2W.4- X-Yahoo-SMTP: dLaMIUmswBCkbwTeGmAXbmPRif0K_4ZI X-Rocket-Received: from [10.238.183.243] (flycassutts@174.228.202.140 with ) by smtp205.mail.ne1.yahoo.com with SMTP; 31 May 2013 11:07:17 -0700 PDT Subject: Re: [LML] Re: Lancair 360 CHT during climb References: From: Art Jensen Content-Type: multipart/alternative; boundary=Apple-Mail-670CE9BD-AEF6-48B7-8438-45D3D3C0172D X-Mailer: iPhone Mail (10B329) In-Reply-To: X-Original-Message-Id: X-Original-Date: Fri, 31 May 2013 14:07:14 -0400 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-670CE9BD-AEF6-48B7-8438-45D3D3C0172D Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Also read: http://egaa.home.mindspring.com/engine2.htm. This article suggest= s that while the cylinder may be able to take 500 degrees for a time, the we= aker link may in fact be the valves and valve guides.=20 Sent from my iPhone; Art Jensen On May 31, 2013, at 12:45 PM, Colyn Case wrote: > talk to the man: mike.busch@savvymx.com >=20 > On May 31, 2013, at 11:21 AM, Paul Miller wrote: >=20 > Colyn: I just re-read that article, Busch states: >=20 > (The head's tensile strength is reduced to 50% of its room-temperature va= lue at a CHT of 400F, and to about 33% at 500F.) >=20 > I don't see that supported in any literature studying the properties of st= eel versus temperature. There appear to be small changes in elasticity,stre= ngth of a few percent in the range we fly in but it appears that big changes= need to be in the 500-900C range. I'm not convinced that Busch is right on= this one. >=20 > Paul=20 > Legacy (cylinders currently at room temperature and high strength)=20 > On 2013-05-31, at 7:21 AM, Sky2high@aol.com wrote: >=20 >>=20 >>=20 >> I think Grayhawk posted a chart a while back that plotted cylinder streng= th vs. temp but I can't find it. I did find this article by Mike Busch in= which he says that at 400 degrees the cylinder is half as strong as when co= ld and makes a number of other points about CHT's. http://www.avweb.com/ne= ws/savvyaviator/savvy_aviator_59_egt_cht_and_leaning_198162-1.html >=20 --Apple-Mail-670CE9BD-AEF6-48B7-8438-45D3D3C0172D Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Also read: http://egaa.home.mindspr= ing.com/engine2.htm. This article suggests that while the cylinder may b= e able to take 500 degrees for a time, the weaker link may in fact be the va= lves and valve guides. 

Sent from my iPhone; Art Jensen

On May 31, 2013, at 12:45 PM, Colyn Case <colyncase@earthlink.net> wrote:

talk to the man:  mike.busch@savvymx.com

On May 31,= 2013, at 11:21 AM, Paul Miller wrote:

Colyn: I just re-read that article, Bus= ch states:

 (The head's= tensile strength is reduced to 50% of its room-temperature value at a CHT o= f 400F, and to about 33% at 500F.)

I don't see th= at supported in any literature studying the properties of steel versus tempe= rature.  There appear to be small changes in elasticity,strength of a f= ew percent in the range we fly in but it appears that big changes need to be= in the 500-900C range.  I'm not convinced that Busch is right on this o= ne.

Paul 
Legacy (cylinders cu= rrently at room temperature and high strength) 
On 2013-05-31, at 7:21 AM, Sky2hig= h@aol.com wrote:



I think Grayhawk posted a chart a while back that plotted cylinder=20= strength vs. temp but I can't find it.    I did find this arti= cle=20 by Mike Busch in which he says that at 400 degrees the cylinder is half a= s=20 strong as when cold and makes a number of other points about CHT's.=20   http://www= .avweb.com/news/savvyaviator/savvy_aviator_59_egt_cht_and_leaning_198162-1.h= tml


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