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Date: Wed, 26 Sep 2007 22:17:40 -0400
From: "Tracy Crook" <tracy@rotaryaviation.com>
Sender: rwstracy@gmail.com
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Oil Delta - T
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Engine will cool at any throttle setting that enables the plane to fly.  The
coolant & oil temp curve looks about like the power required curve of the
airframe, minumum at around 95 mph and rises on either side of that speed.
Only exception is WOT at Vx on hot day.  Engine will exceed redline temps if
this is maintained more than a minute or so.   Fortunately there is never
any real need to do that.

Tracy


On 9/26/07, Mark Steitle <msteitle@gmail.com> wrote:
>
> Tracy,
>
> Is there a particular speed that you must reach before your system cools?
>
>
> Mark
>
>
>
> On 9/26/07, Tracy Crook <tracy@rotaryaviation.com> wrote:
> >
> > For another data point, the delta T on oil cooler depends on power
> > setting on my installation (no big surprise).  It is around 40 degrees F at
> > higher power settings.
> >
> > Tracy
> >
> >
> > On 9/18/07, Mark Steitle <msteitle@gmail.com > wrote:
> > >
> > > For those that are flying (rotaries), I'm curious as to what delta-T
> > > you're seeing across the oil cooler.  And at what speed you attain adequate
> > > cooling.
> > >
> > > Mark S.
> > >
> >
> >
>

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<div>Engine will cool at any throttle setting that enables the plane to fly.&nbsp; The coolant &amp; oil temp curve looks about like the power required curve of the airframe, minumum at around 95 mph and rises on either side of that speed.&nbsp; Only exception is WOT at Vx on hot day.&nbsp; Engine will&nbsp;exceed redline temps&nbsp;if this is maintained more than a minute or so.&nbsp;&nbsp; Fortunately there&nbsp;is never any real need to do that.&nbsp;
</div>
<div>&nbsp;</div>
<div>Tracy<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 9/26/07, <b class="gmail_sendername">Mark Steitle</b> &lt;<a href="mailto:msteitle@gmail.com">msteitle@gmail.com</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>Tracy, </div>
<div>&nbsp;</div>
<div>Is there a particular speed that you must reach before your system cools?&nbsp; </div>
<div>&nbsp;</div>
<div>Mark</div>
<div><br><br>&nbsp;</div>
<div><span class="gmail_quote">On 9/26/07, <b class="gmail_sendername">Tracy Crook</b> &lt;<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:tracy@rotaryaviation.com" target="_blank">tracy@rotaryaviation.com
</a>&gt; wrote:</span> 
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>For another data point, the delta T on oil cooler depends on power setting on my installation (no big surprise).&nbsp; It is around 40 degrees F at higher power settings.</div>
<div>&nbsp;</div>
<div>Tracy<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 9/18/07, <b class="gmail_sendername">Mark Steitle</b> &lt;<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:msteitle@gmail.com" target="_blank">msteitle@gmail.com</a>
 &gt; wrote:</span> 
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>For those that are flying (rotaries), I&#39;m curious as to what delta-T you&#39;re seeing across the oil cooler.&nbsp; And at what speed you&nbsp;attain adequate cooling.</div>
<div>&nbsp;</div>
<div>Mark S.</div></blockquote></div><br></blockquote></div><br></blockquote></div><br>

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