I have a SuperStar 60 ARF Trainer fitted with a Thunder Tiger 61 Pro. I highly recommend any 60 size trainer over a 40 size one, as they are a lot more stable, and cope better in windy days. Plus the TT 61 Pro costs that same as a OS 46 fx engine, and others $20 more. I only paid $100 for the engine (and you can use the engine in your next plane)