It has an OS 61. Plenty of power for my flying, just a few loops and some rolls, no 3D for me at least not for a long time. Just flew it yesterday for the first time and I love it. It is vey big and easy for this old man to see. Flew several times and had several good landings but on one I dropped the right wing on the runway [asphalt] did slight damagew to the tip, should be about a 1 hour fix. Still don't have the engine tuned where it will idle properly so all the landings were to fast. Will get our clubs expert tuner to set it up on Monday.