"Ray Richardson Jr." wrote:

I flew yesterday (summer heat wave)  OAT   93 deg. F.

coolant temps 206 deg. climb,  191 cruise
oil temp   223 deg (in pan) climb, 200 deg cruise. Note;  we cool the
oil then send it through the engine to pick-up heat.

This test was done (with and with-out) a
1" height REDUCTION plug,   in our cowl opening
total temp change (with and with-out plug) was only 2 deg.

Reminder,  we are cooling a proven 215 hp engine.
2 small rads. in the standard vents,  do not work for us.

Concusions;

1) The changes we have made have reduced temps.
    by 25 degs.

2) We have proven we can reduce the cowl opening
    to reduce drag for the production units.

3) internal ducting could improve our system more.

4) Oil to water cooler is working, but futher improvements
    are still desired.

Last year congf. we could not have flown.
due to high temp.

Note; we are not done, but we are much better.

Ray

 
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