To: flyrotary@lancaironline.net
Subject: [FlyRotary] Re: typical operating temperatures
Reply-To: rogersda@myway.com
From: "Dale R." <rogersda@myway.com>
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Message-Id: <20040413005249.5170312D23@mprdmxin.myway.com>
Date: Mon, 12 Apr 2004 20:52:49 -0400 (EDT)


Hi Rotorheads,

- On Mon 04/12, Russell Duffy < 13brv3@bellsouth.net > wrote:
>>What coolant and oil temps should I be looking for in the climb and at cruise?
>>What temps are 
considered red-line / never exceed?
>>
>Water should be kept safely below the boiling point, 
which will vary with pressure and coolant percentage.  I can't recall the 
number, but I believe Lynn once stated that you start losing some power above 
180 degrees. 
>

   Okay, here's the original responses from the archives:

 From:     "Tracy Crook" <lors01@msn.com> 
 Date:     2003/09/03 Wed AM 11:10:19 EDT
 To:       "Rotary motors in aircraft" <flyrotary@lancaironline.net>
 Subject:  [FlyRotary] Re: Fwd: [FlyRotary] Re: flight #2 and #3

 Lynn wrote:
 The oil temp, measured as close to the rear main oil gallery as possible,
 should be 210 or below. That is because the bearing overlay material is
 loosing strength with higher temps. This is a rule developed based on
 racing, (Racing Beat) where RPMs will be around 9,000 for 13Bs. Or 9,500 for
12As. Bearing stress is lower around 6,500 RPM. Still, it's not a bad idea to
 Keep the oil well under 200 degrees. The engine builder reports power lost
 above 160 degrees on the oil temp. 
 Water under 200 is OK. Power loss above 180, but no damage.

 -----

 Lynn's comments have been 'on the money'  with my own
 experiences.  BTW Rusty, at high throttle, my oil temps in
 the pan have run 35 - 40 degrees hotter than after the
 cooler so you might not have a problem at all.  It will be
 very interesting to see what your engine inlet oil temps
 are.  I love that dual water - oil cooler setup you have.
 If there are enough square inches of transfer area, this is
 hard to beat.
 ...

 Tracy

Between Lynn's statement and other info about the minimum 
temperatures (140* water?), it looks like there is a fairly 
limited range of temps where best power is produced: roughly 
170 - 180*F for water 140 - 160*F for Oil (at the bearings; 
maybe 200 in the pan.) 

Regards,
Dale R.


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