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Message-ID: <5cf132c0709270513o590a988dob452fc66d11acc1f@mail.gmail.com>
Date: Thu, 27 Sep 2007 07:13:45 -0500
From: "Mark Steitle" <msteitle@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Oil Delta - T
In-Reply-To: <list-2354075@logan.com>
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Tracy,

So, what do you call a "hot" day?  In Austin, it is normal during the summer
for temps to be in the upper 90's and even above 100 on occasion.  I don't
want to be grounded waiting for the Texas heat to subside.  I guess I could
install a spray bar for summer flying.  Right now I can keep temps in the
green up into the low 90's.  Living in Texas, I would like a little more
margin than that.  Not everyone can swing a summer home in Colorado.   ;-)

Mark S.
(Just happy to be flying again.)




On 9/26/07, Tracy Crook <tracy@rotaryaviation.com> wrote:
>
> 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>Tracy,</div>
<div>&nbsp;</div>
<div>So, what do you call a &quot;hot&quot; day?&nbsp; In Austin, it is normal during the summer for temps to be in the upper 90&#39;s and even above 100 on occasion.&nbsp; I don&#39;t want to be grounded waiting for the Texas heat to subside.&nbsp; I guess I could install a spray bar for summer flying.&nbsp; Right now I can keep temps in the green up into the low 90&#39;s.&nbsp; Living in Texas,&nbsp;I would like a little more margin than that.&nbsp; Not everyone can&nbsp;swing a&nbsp;summer home&nbsp;in Colorado.&nbsp;&nbsp; ;-)
</div>
<div>&nbsp;</div>
<div>Mark S.</div>
<div>(Just happy to be flying again.)</div>
<div>&nbsp;</div>
<div>&nbsp; <br><br>&nbsp;</div>
<div><span class="gmail_quote">On 9/26/07, <b class="gmail_sendername">Tracy Crook</b> &lt;<a href="mailto:tracy@rotaryaviation.com">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>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 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>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></blockquote></div><br>

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