In California I lived near one of the Malibu Grand Prix cart tracks. The literature on the highly developed carts they had said the engine was a proprietary Wankel rotary engine.
I have looked all over the net but never found information to support it.
Now I only see descriptions of piston engines.
This was a long time ago but it seems a smaller engine that might have use in smaller aircraft?
...Chrissi

That was  a Shachs (s?) engine as I recall.

Wankel sold a few aircraft engines but I suspect they had trouble with
the nicosil wear coatings on the aluminum housings. They had a company in
England doing it and apparently they were not able to get the quality
control that Malle(s?) did. I tried to talk Juergen into detonation gun coatings
but it is hard to change the mind of a German. I know I am one. :-)>

Paul Lamar
 
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