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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Re: Oil and warming up
X-Original-Date: Wed, 6 Apr 2005 07:20:39 -0500
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Craig:

The side loads at the very low rpms with cold oil are a factor in my=20
mind.  If it drops 50 rpm, the prop governor is working!  Now, in a=20
twin, I do cycle all the way down to be certain that the thing will=20
feather.  Not the same concern as in a single.

Walter


On Apr 5, 2005, at 6:36 PM, Craig Berland wrote:

Gene: **my engine builder ademently expressed that I
not pull rpm down to much when cycleing prop, no more than 50rpm or I
could scuff a piston on my low time tight cold engine.**

***That's actually very good advice on all engines of all times in=20
service.Walter***
=A0
Walter, the logic escapes me???=A0 I could see the concern if you were =
at=20
WOT and
  pulled the prop back 800 RPM or so.=A0 But, 50 RPM at part throttle=20
during run up??
I would be more concerned that the prop governor did not work that the=20=

engine
  being hurt by 150 RPM drop at part throttle.
Craig Berland



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Craig:


The side loads at the very low rpms with cold oil are a factor in my
mind.  If it drops 50 rpm, the prop governor is working!  Now, in a
twin, I do cycle all the way down to be certain that the thing will
feather.  Not the same concern as in a single.


Walter



On Apr 5, 2005, at 6:36 PM, Craig Berland wrote:


<fontfamily><param>Times New Roman</param>Gene: **my engine builder
ademently expressed that I</fontfamily>

<fontfamily><param>Times New Roman</param>not pull rpm down to much
when cycleing prop, no more than 50rpm or I </fontfamily>

<fontfamily><param>Times New Roman</param>could scuff a piston on my
low time tight cold engine.**</fontfamily>


<fontfamily><param>Times New Roman</param>***That's actually very good
advice on all engines of all times in service.Walter***</fontfamily>

=A0

<fontfamily><param>Times New Roman</param>Walter, the logic escapes
me???=A0 I could see the concern if you were at WOT and</fontfamily>

<fontfamily><param>Times New Roman</param> pulled the prop back 800
RPM or so.=A0 But, 50 RPM at part throttle during run up??</fontfamily>

<fontfamily><param>Times New Roman</param>I would be more concerned
that the prop governor did not work that the engine</fontfamily>

<fontfamily><param>Times New Roman</param> being hurt by 150 RPM drop
at part throttle.</fontfamily>

<fontfamily><param>Times New Roman</param>Craig Berland</fontfamily>




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