Price of 30% isn't insignificant, but I can handle it. What worries me only about the wankle is all those internal seals. I don't want to wear them out real quickly. I only have 2 runs on the 30 and it seemed ok, but I plan to fly the plane all day tomorrow to work on the trim. it's basically a new plane now so it will take some time to tune. In the mean time I don't want to destroy the engine using the wrong fuel. My gut feeling is that there is so much oil in heli fuel that the engine should be fine.

I'm hoping it can turn that 11 x 3 without straining the engine too much and overheating. I think it should be fine too since it can turn a 10 x 6 with no problem.

The prop won't be here until next week so I'm stuck with the 10 x 4 for now. When I get the new prop I'll post whatever I learn about it.