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Date: Wed, 04 Jan 2006 20:18:15 -0500
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From: "Jim Nordin" <panelmaker@earthlink.net>
Subject: Idle power descent?
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In-reply-to: <list-912205@logan.com>

Gentlemen and ladies,

The idea of shock cooling has been a subject brought up many times on the
LML and others, generally as a passing statement ... "I avoid pulling the
throttle at altitude to avoid shock cooling." I still struggle with the
implied harm from the effect ... that is ... what is it? I think most
imagine a cylinder head cracking.

Although no one will argue there are affects on metal with sudden large
thermal changes, there doesn't seem to be any empirical evidence these
changes induce harmful affects to the degree we avoid inducing them or
detecting them.

I have brought it to the LML attention in the past about comments on "shock
cooling" and wish to again so not to have the fear of harming your expensive
engines cost you sleep or act without cause. I have received emails on my
bringing this to everyone's attention as just "comments" from someone who
nobody knows, Kas Thomas. 

I think there are enough wives tales out there that taking up mental cycles
worrying about imagined scenarios warrants ... little or no time. Or maybe
just enough time to read this article ... 

http://www.avweb.com/news/maint/182883-1.html 

Keep evidence the motivation to worry, purchase or change ... for many would
be helpful technos, will be pleased to provide expensive instruments and
gadgets to avoid ... nothing harmful. Got too much money? Fill'er up.

Jim


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