X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 31 May 2013 12:01:25 -0400 Message-ID: X-Original-Return-Path: Received: from nm7-vm3.bullet.mail.gq1.yahoo.com ([98.136.218.210] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6300212 for lml@lancaironline.net; Fri, 31 May 2013 11:49:46 -0400 Received-SPF: none receiver=logan.com; client-ip=98.136.218.210; envelope-from=chris_zavatson@yahoo.com Received: from [98.137.12.56] by nm7.bullet.mail.gq1.yahoo.com with NNFMP; 31 May 2013 15:49:12 -0000 Received: from [98.136.185.44] by tm1.bullet.mail.gq1.yahoo.com with NNFMP; 31 May 2013 15:49:12 -0000 Received: from [127.0.0.1] by smtp105.mail.gq1.yahoo.com with NNFMP; 31 May 2013 15:49:12 -0000 X-Yahoo-Newman-Id: 445268.82278.bm@smtp105.mail.gq1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: PJw4u3QVM1ktXfeMKCqcGV2gt5vhTZ6YwYWluZyaSMoWUJF jhQWGTneaLdM5e4uKtbHI8x2YixlSEzH6tq1ewwFuDnoOkqxvaQkurj9S7IQ 0NC9a3FSZT66UGecpCKsfXI8OMkyQNaePFPK4hBozxd.0rFEe5jVey78dX7o m5GDTqpHLD_B8j8QzokGTdWiQ1toznow_NVyxZfJEIBcsGsSsZAGLN1CB61h vfoGK6KpMtLMU6zB4OtcOZIcLW95Aw.hP1sZIga08AUXoBh.fLkhIOXS_UDj moTZ5rB9wir1JJtCQRWSLEJgIUcBAOmyy_ZlGwmrb1RDn_CRW7EF1odhCdRV Eph.cqDMnqbRgLPB8U8eoQmLZ2eBuNErHfT1wq8vVVt_mTqLgfPRnUMihtRS UyK9PTWgvxKr.IaB.Lq3jsLJUKndGJh07nKM1EYdkAn8xHpAahRxh9QK3ubK PbtVT954AXotWlARMZkaouz.LdHiQ5QMHS3JrDI8yBMc4lC54dOQxwFmOKuy BOC2u2L18zEya.KkEMEYQhN97x51rvSvZfFcKV3zUC_RaEPjDQm2NHlSgUJl .Va96fRZjq5pRjjr6SOgqlMWioZpuTarNgzoSdNZMp8_fWG6twxnLSMkpvGx bxcVwTTS.VeeeuNXIo_2RD0zpfbWJ9FSvUgc1nSROZAVbMRG1xEw0OaQXCny QJ6ByvU0bbNYVxjSK X-Yahoo-SMTP: 076hgjCswBC.G6e0vm7vgvZ9JJ0zmeBo_Oyw X-Rocket-Received: from [10.137.18.34] (chris_zavatson@198.228.213.191 with ) by smtp105.mail.gq1.yahoo.com with SMTP; 31 May 2013 08:49:12 -0700 PDT Subject: Re: [LML] Re: Lancair 360 CHT during climb References: From: Chris Zavatston Content-Type: multipart/alternative; boundary=Apple-Mail-040F1EFD-B775-43C2-BE43-94515E738013 X-Mailer: iPhone Mail (9A405) In-Reply-To: X-Original-Message-Id: <7B8E6898-1857-4F26-812A-760684A86AE7@yahoo.com> X-Original-Date: Fri, 31 May 2013 08:49:03 -0700 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-040F1EFD-B775-43C2-BE43-94515E738013 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Our heads are aluminum and will melt at 6-700 C (~1100F). Chris Zavatson N91CZ 360 std www.N91CZ.net Sent from my spiffy iPhone On May 31, 2013, at 8:21 AM, Paul Miller wrote: > 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-040F1EFD-B775-43C2-BE43-94515E738013 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Our heads are aluminum and= will melt at 6-700 C (~1100F).

Chris Zavatson

N91CZ

360 std

www= .N91CZ.net

Sent from my spiffy iPhone

On May 31, 20= 13, at 8:21 AM, Paul Miller <pjdmi= ller@gmail.com> wrote:

Colyn: I just re-read that article, Busch states:

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

<= font color=3D"#333333" face=3D"Verdana, Arial, sans-serif">I don't see that supported in any literat= ure studying the properties of steel versus temperature. There appear t= o be small changes in elasticity,strength of a few percent in the range we f= ly in but it appears that big changes need to be in the 500-900C range. &nbs= p;I'm not convinced that Busch is right on this one.

=
Paul
Legacy (cylinders currently at room temperature a= nd high strength)
On 2013-05-31, at 7:21 A= M, 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 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

= --Apple-Mail-040F1EFD-B775-43C2-BE43-94515E738013--