Paul,  It seems that no matter what you do to a scaled down mazda version,
there is no one good way to cool it. IF there isn't one then how about two or
three. 
Is it possible to also use air cooled fins on the outside in critical
areas while also using water cooling with larger fins internally? 

I guess that would be possible. You perhaps could use water cooling
to cool the difficult to air-cool center housing and air-cooling to cool
the rotor and end housings. Sounds like a really good idea as you would 
have a greater temp difference on the rotor housings hence more 
efficient overall cooling. I am not sure you could get enough
fins per inch on there to handle such a concentrated heat source.
Unlike a four stroke piston engine the combustion chamber in 
a rotary does not get a chance to cool off every other stroke.
It is like a two cycle piston engine in that regard. On the other
hand  water cooled two strokes seem to be less likely to seize.

Jeff has had some first hand experience with this as he has 
redesigned the OMC engine for two rotors and water cooling
for Moller. Ron Davis did the rads for Moller.

BTW the 150 HP Moller two rotor engine would make one hell of 
an ultra light engine. I wonder why that has not occurred to 
Dr. Moller. Why don't we all bug him? :-)

The group
talked about water injection before... That is a wonderful way to cool the
combustion mixture as well as scrubbing the internals with superheated steam
to take off all the carbon. If we could increase the heat transfer to the
walls and then to the water jacket two systems may work out better in this
engine.since the water injection could be used only in times of thermal
overload (high H.P.) you really would not use up that much water . The
mixture would be cooler and the heat transfer would be better and therefore
the engine would not have to "heat sink" as much in the metal internals.
Just a thought.... maybe you and Rickie Stitts (hi Rick) might want to
comment on this .    JIM DANA

 
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