Tall Paul,

Interesting to hear that you have solved the heating problem associated with the rear engine. I am building a scale model of the Swedish fighter I mentioned in my earlier post. Still unsolved is how to cool the rear engine. I thought of having an electrical fan and putting the battery in the nose where weight anyway is needed. But I have no idea how strong fan I need.
I have tried to estimate how much heat the engine generates. The engine an YS120 has roughly the power of 2 hp. That is about 1500 watts. If I assume the engine to have an efficiency of 25% it will also produce 4500 watts of heat. That is an enormous amount of heat to cool away. If these figures are correct it is easy to understand that cooling can be a crucial issue.

Maybe ducts would be a better solution even if they are not so simple to implement on this plane.

Paul, it would be interesting to hear how big ducts you have on your plane and if there is any complicated baffling. A picture of the installation would be of great help.

/PO