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Thanks Bill, that makes sense, we
definitely do not want lower thermal conductivity. I had never heard of the stuf
before, but hapend to see it used on a TV show where they rebuilt the
head on a Triumph TR6.
Michael Silvius
----- Original Message -----
Sent: Thursday, October 10, 2013 2:42
PM
Subject: [FlyRotary] Re: waterless
coolant?
Next time I am at my hanger, I will pull my file. I have a presentation
made by Evans on the coolant.
Bottom line: lower Heat capacity, lower thermal conductivity, higher
viscosity (all in the wrong direction)
Then why use it? In a Diesel over the road truck, you can run at a higher
temperature, and therefore be a little more efficient. We cannot take
advantage of this with the Rotary because of the O-ring seals, so we only get
the negatives and not the positives.
Bill Schertz
Sent: Thursday, October 10, 2013 1:15 PM
Subject: [FlyRotary] Re: waterless coolant?
You might want to check what happens to the viscosity of this fluid at
lower temperatures. Its been a while, but as I recall this fluid
turns into heavy syrup at lower temps. You can visualize your water pump
churning (cavitating) in a void of this fluid at low temperatures while
not moving any through your cooling system.
The fluid next to the rotors would undoubtedly get hot -while that
in the radiator and water pump may act as a (Temporary) plug to coolant flow –
until the heated fluid explosively forces the issue.
I tried finding the viscosity charts they used to have on the site, but
could not find it.
My impression when I looked into this fluid back a few years ago, was
that this heavy viscosity at low temps was probably not much of a draw
back compared to the benefits in a racing motor – heated garage, summer
temps, etc. But, might be a different story for aircraft
application.
Ed
Edward L.
Anderson
Anderson Electronic Enterprises LLC
305 Reefton
Road
Weddington, NC
28104
http://www.andersonee.com
http://www.eicommander.com
Sent: Thursday, October 10, 2013 1:05 PM
Subject: [FlyRotary] Re: waterless coolant?
This
appears interesting. I looked at the website and was unable to find the
heat capacity of the fluid. The higher boiling temp may not be helpful
if the heat capacity is such that you need a large delta T to transfer the
same amount of heat as a water-based system.
One
must also consider the effect of the higher operating temperature on engine
oils. At some temperature, oil loses its lubrication ability. I
don’t know what that temp is but assume it is different for different
oils. Just because the coolant allows higher operating temperatures,
doesn’t mean one should do that.
Gordon
C. Alling, Jr., PE
President
acumen
Engineering/Analysis,
Inc.
540-786-2200
www.acumen-ea.com
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Michael
Silvius
Sent: Thursday, October 10, 2013 1:19 PM
To:
Rotary motors in aircraft
Subject: [FlyRotary] waterless
coolant?
While on the subject of
cooling, I am curious if anyone has tried the waterless coolant? Seems to
offer some advantages, namely higher boiling boint and low pressure, is there
any reason it should not be used in our
aplication?
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