'Although you have ram air cooling for the cylinders, I don't
believe you
'can cool the oil substantially without using the radiator. If your
oil
'temp doesn't increase when you have the flap closed, I suspect that
'there is still plenty of air going through the radiator.
'Frans
Frans,
As I said in my original post "The door can close the duct completely"-
plainly there will be some leakage around the door, but not much. Although
the position indicator shows the door closed, I would need a camera to
observe the door in flight to be absolutely sure. Your point about oil
temperature is not my experience over the years I have been flying the
aircraft. Almost always, the oil temperature lags the CHT/water
temperature. I have never seen the oil temperature above the water/CHT.
With the original configuration, that is with both radiators mounted
adjacent, the temperatures of cht/water/oil were usually identical. Some
years ago, during a particularly hot summer in Switzerland, after take-off
during a slow climb following Dave Buzz, I had a lot of trouble keeping the
temperatures within limits. The only way to rectify the situation, was to
leave the formation and fly back down the valley at a higher airspeed.
After that trip, I lowered the oil cooler to improve the overall cooling.
However, with my aircraft, flying at the higher IAS is the answer.
Regards,
Mike
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