FUBAR03 - The Magnum .52 doesn't have a power rating listed in Tower. The power of the OS.50 is 1.8hp and 13.7 oz weight. An excellent choice in power. For the record, I fly the Seagull version of the Decathlon with an OS .46AX At 1.65hp and 13.2 oz. and it pulls the Hell out of the plane!