ORIGINAL: rc bugman
Mark,
The engines are exposed but we have ducting around the cylinders to direct airflow around the cylinders including the back of the cylinder. One plane with a 212 4 cylinder worked fine and did not seem to get hot. A second plane with a 200 2 cylinder also worked great and did not seem to get hot. The third plane with a 200 2 cylinder flew for a number of flights, but then appeared to get hot after about 20 min of net pulling, stuck a ring, lost power and did a cool tail slide into the woods. Perhaps we developed a fuel flow problem which leaned the mixture or some other problem. The tail slide only destroyed the fuse with minor damage to tail and wings. The plane is ready to go for another season.
Elson
Elson,
Thanks for the info. I figured you had worked on it, because you have done an excellent, thorough job of everything else. Any pics of the ducting? I am always interested in what others have done for cooling solutions, especially someone who runs their engines so hard for such long periods of time. PM me to send them off list if you want or if we are drifting too far OT here.
Mark