A flying buddy has a Wankel. He only ran it long enough to be sure of its characteristics. He complained that didn't put out the power to justify the high fuel consumtion. Watching the performance of the plane I agreed that the power output was no big deal. A 25FX would have enough power for the LT25. I have an OS 32SX on my sons plane and it can take off in about 15 feet and then go vertical! The engine is a bit pricy but the power output is high, the engine is quiet, and its very good on fuel useage. A few tips: join the wings together with only 1 1/2" total dihedral. The plane will still self level and will be able to handle windy conditons fairly easily. Also replace the bolts with standard wheel axles and go with 3" light weight wheels. Go with 1" tail wheel instead of the miniscule 3/4". [8D]