Yeah, I've seen those too. Cool idea, but they only run for a few seconds at a time, necessitated by the fact that the OS wankel engine is heatsinked for airplane use instead of ground-vehicle use. I prefer my fun to last longer than that.

Since I made this thread, I've run the engine several times while attached to an airplane (though not actually flying because I haven't bought the AMA membership necessary to access the local RC airfields, and there aren't any random open spaces big enough, and I don't know how to fly an airplane yet so I'm scared to go solo with a vintage engine). The engine runs very well on 10% nitro with 18% synth spiked with enough castor to raise it to 25% oil overall.