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

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