X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from elasmtp-scoter.atl.sa.earthlink.net ([209.86.89.67] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTP id 6300397 for lml@lancaironline.net; Fri, 31 May 2013 12:46:11 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.67; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=iJvJ83ZnJPgeSLBKpUI9ANuPEYK7x57XZCEeQLMlhr11iMmvIhMDHvfEfwGofSVR; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [71.181.17.133] (helo=[192.168.1.24]) by elasmtp-scoter.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1UiSSQ-0007kg-5j for lml@lancaironline.net; Fri, 31 May 2013 12:45:38 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-350-869512978 Subject: Re: [LML] Re: Lancair 360 CHT during climb Date: Fri, 31 May 2013 12:45:36 -0400 In-Reply-To: To: "Lancair Mailing List" References: Message-Id: X-Mailer: Apple Mail (2.1085) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da9401610014a6d9dcc2d8bd26651de090af5350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 71.181.17.133 --Apple-Mail-350-869512978 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii 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, 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-350-869512978 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii 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, Busch = states:

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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