From: "Jeff Whaley jwhaley@datacast.com" <flyrotary@lancaironline.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: RE: FlyRotary: Re: Thermostat for winter operations
Thread-Topic: FlyRotary: Re: Thermostat for winter operations
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Date: Tue, 30 Jan 2018 18:22:03 +0000
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Yes, I too will be wary of the thermostat and if I had found one that was a=
 little cooler, say 170F I likely would have selected it; however, there wa=
s only 180F or 190F to chose from.  Mindful of the "temperature over 160F h=
urts power" I can't say there was any detectable power reduction during my =
climb out.  Typically cruising at 180F on warm days was not unusual when op=
erating without a thermostat.  The main difference between with or without =
is how the engine warms up: without a thermostat the engine, coolant and ra=
diator all heat up gradually in uniform fashion; with a thermostat the engi=
ne heats up more rapidly and cools itself by burping hot coolant out throug=
h the thermostat and replacing it with cold/colder fluid from the radiator.=
  One thing I did not mention is that my heater core loop is plumbed throug=
h a larger oil cooler for extra cooling in the summer and for cabin heat in=
 the winter.  Thus there is a larger volume of coolant being heated gradual=
ly than with just a radiator alone.

Anyway it sure is nice to be able to chop the power on a cold day and glide=
 in for a landing without worrying about engine temps dropping back into th=
e 110F range and having cabin while taxiing back to the hangar.

Jeff Whaley

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20
Sent: Monday, January 29, 2018 11:19 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Thermostat for winter operations

When I built my Rotary, I cut the pump down and removed the thermostat. I r=
eplaced the thermostat with a restrictor orifice. I built a cowl flap to co=
ntrol airflow\water temp but I need to change the actuator for more mechani=
cal advantage. In 20 degree air I am only getting up to 120 degree water te=
mp.=20

Dave Williams
Wisconsin

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20
Sent: Monday, January 29, 2018 7:15 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Thermostat for winter operations

Well, I am wary of thermostats, an old Volvo truck and a 2 year old Mercede=
s wagon have left on the side of the road with stuck shut thermostats, luck=
ily both times within 10km walking distance of home. am I just unlucky?
If I do install one in the plane it will become part of the annual inspecti=
on to remove and check its operation in boiling water.


Andrew

On Tue, Jan 30, 2018 at 7:20 AM, Charlie England ceengland7@gmail.com <flyr=
otary@lancaironline.net> wrote:
No doubt Lynn is correct. But while power is everything to a racer, it rare=
ly is everything to the rest of us. Look at how temps in cars have been inc=
hing upward for decades. If metallurgy & lubricants would allow it, they'd =
be running 500 degree engines because it's more efficient (Lower delta-T; l=
ess energy lost to the coolant/outside world, where it's not doing any work=
).

On Mon, Jan 29, 2018 at 4:49 PM, Kelly Troyer keltro@gmail.com <flyrotary@l=
ancaironline.net> wrote:
Guys,

   None other than our Rotary Guru Lynn Hanover has stated in the past that=
 coolant temps over 160F hurt power........Perhaps
he will Chime in here again and enlighten us !!............<:)