RE: The Usual Cooling Issue
Hoggle can you take and post pics?
Try flying it 1 time without the dummy engine cover and see if the 90SP performs correctly; it may have died for other reasons than overheating.
ps. I thought the ratio was 1:3 not 1:2? I've always read to give 3X the exit area as compared to intake area for proper cowled engine cooling. But try flying it 1st without the dummy engine cover and make sure that airflow is really the problem... actually you shouldn't even have to fly it just running it up on the ground for a few minutes standing with your legs in front of the hoizontal tail fin to hold the plane back should tell you alot. And post pics!
- Michael