Gonzalo,

Sorry to be contrary, but in my opinion the ONLY way to go for a flying rotary is P-port. All of the original Power Sport engines (the Everette Hatch P.S.) ran P-ports. The manifolding for a P-port engine is vastly easier. In fact Hatch and Steve Beckham built several engines with P-ports that even ran reverse rotation so they could get proper propeller rotation with some gearboxes. You can even P-port an Renesis and it still works. The reason that Mazda isn't P-porting their race cars has nothing to do with if P-porting is better, it is racing organizations requirements. The reason for the side port Renesis is for emissions and low RPM fuel economy. Those are areas that are only important in a CAR. The typical aircraft runs 50% to 90% ALL THE TIME and P-ports are much better at mid to high RPMS. The Mazda Le Mans winning engine used P-ports and they were running with a fuel economy formula. (the fuel was limited) For high output P-ports just work better.

Bill Jepson