To= dd,

Th= at 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 = ?

St= eve 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;<= /p>

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.<= /p>

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;<= /p>

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?<= /p>

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)<= /p>

<= /p>

Todd Bartrim

<= /p>

RV9Endurance<= /p>

13B Turbo Rotary

C-FSTB<= /p>

&nbs= p; "The world will always have a place for those that bring hard work = and determination to the things they do."<= /p>

<= /p>