Todd,
That
oil temperature delta also seems low to me, though I’d be happy with 180 oil
temperature. You mentioned a oil
thermostat, and was not aware of a thermostat on the oil other than the oil
pellet, which I removed. Is there another thermostat ? Where is it located
?
Steve
Brooks
-----Original
Message-----
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Todd Bartrim
Sent: Tuesday, July 20, 2004 12:35
AM
To: Rotary motors in
aircraft
Subject: [FlyRotary]
Oil Delta T was: 11th test flight
Hi
Al;
Nope that's not a
typo. It surprised me as well, but since oil has far less heat carrying
ability than water, that's what I attributed it to. They were not calibrated
sensors & the gauge didn't have fine resolution, so that may account for
some inaccuracy, but I did swap sensor positions. This data was during cruise
flight after temps had stabilized.
Actually I've been so
busy flying that I've not had much time for any reports or discussion, but
there is a few things I've noticed. One is that my oil temps used to lag
behind my coolant temps, while now they are very close to the same, since I've
rebuilt the engine. I've been thinking about this and one possible explanation
that I've come up with is;
I used to have my
rotors ceramic coated to reduce heat absorption by the rotor and in turn by
the oil, however when I tore the engine down the ceramic coating was all but
gone with only a few traces left. So I assumed that it had been gone since
soon after first start. However now I wonder if the shock of detonation was
enough to cause the coating to flake off ? This would explain why now I'm
seeing ~20F higher temps on the oil than before the detonation & rebuild?
Anybody have any thoughts on this?
My oil temp used to
climb to approx 180F until the internal oil thermostat would open, then would
actually drop back down to ~160 in cruise as the thermostat seemed to
have some deadband. Now in cruise I never see less than 180F and often
during extended climbs I see 210F. I've not mentioned it yet as the OAT has
also been higher, but I've gone out on some cooler days and still see the same
temps. As I go through so many different flight configurations of climb
speeds/cruise speeds/OAT/etc. I try to log some of this to try to discuss it.
Sure wish I could collect info from the EM2 for datalogging (hint,
hint)
Todd
Bartrim
RV9Endurance
13B
Turbo Rotary
C-FSTB
"The world will always have a place for those that bring hard work and
determination to the things they do."