O.S. MAX 160FX Ring m/E-5010 Dämpf. OS L-OS19260 pressive bhp for its compact external dimensions. Its porting has been optimised for low RPMs and is quite happy turning big props on a scale model or low diameter/high-pitch props on a pattern aircraft. The ringed piston on this size of engine allows easy starting and has a forgiving nature when it comes to tuning the main needle for optimum performance.