OMP FF540P engine?
My OMP started out with a Royal .46, about 8 flights later and being tired of messing with the engine I bought a TT .46 for it. I fixed the Royal FYI, but the TT is awesome on it. It hovers a little above 1/2 throttle, pulls out with authority. I'm running an APC 11x5 prop, this week I'm going to try a 12.25x3.75 also.