X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 31 May 2013 11:21:53 -0400 Message-ID: X-Original-Return-Path: Received: from mail-pd0-f173.google.com ([209.85.192.173] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6300205 for lml@lancaironline.net; Fri, 31 May 2013 11:21:03 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.192.173; envelope-from=pjdmiller@gmail.com Received: by mail-pd0-f173.google.com with SMTP id v14so2364435pde.18 for ; Fri, 31 May 2013 08:20:29 -0700 (PDT) X-Received: by 10.66.162.38 with SMTP id xx6mr14401129pab.69.1370013629781; Fri, 31 May 2013 08:20:29 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.1.131] (S010620aa4b008706.cg.shawcable.net. [174.0.112.194]) by mx.google.com with ESMTPSA id gi2sm47136361pbb.2.2013.05.31.08.20.28 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 31 May 2013 08:20:28 -0700 (PDT) From: Paul Miller Content-Type: multipart/alternative; boundary="Apple-Mail=_B92C5A70-67CF-4B07-85AE-FD0C8628865D" X-Original-Message-Id: <662D9445-9639-4FF3-B819-1951264875A1@gmail.com> Mime-Version: 1.0 (Mac OS X Mail 6.3 \(1503\)) Subject: Re: [LML] Lancair 360 CHT during climb X-Original-Date: Fri, 31 May 2013 09:20:26 -0600 References: X-Original-To: "Lancair Mailing List" In-Reply-To: X-Mailer: Apple Mail (2.1503) --Apple-Mail=_B92C5A70-67CF-4B07-85AE-FD0C8628865D Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Colyn: I just re-read that article, Busch states: (The head's tensile strength is reduced to 50% of its room-temperature = value at a CHT of 400F, and to about 33% at 500F.) I don't see that supported in any literature studying the properties of = steel versus temperature. There appear to be small changes in = elasticity,strength 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. 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 > I think Grayhawk posted a chart a while back that plotted cylinder = strength 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 cold and makes a number of other points about CHT's. = http://www.avweb.com/news/savvyaviator/savvy_aviator_59_egt_cht_and_leanin= g_198162-1.html >=20 --Apple-Mail=_B92C5A70-67CF-4B07-85AE-FD0C8628865D Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1

I don't see that supported = in any literature studying the properties of steel versus temperature. = There appear to be small changes in elasticity,strength 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.

Paul

Legacy (cylinders = currently at room temperature and high = strength)

On 2013-05-31, at 7:21 AM, = Sky2high@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 = article=20 by Mike Busch in which he says that at 400 degrees the cylinder is = half as=20 strong as when cold and makes a number of other points about CHT's.=20= http://www.avweb.com/news/savvyaviator/savvy_avia= tor_59_egt_cht_and_leaning_198162-1.html
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