You want MORE POWER to give your .60-size helicopter more authority in challenging maneuvers. You don't want to take on time-consuming mounting modifications and gearing changes.

O.S. has the answer: the 70SZ-H. It installs in the same space as a .61, and operates in virtually the same rpm band...so you can upgrade in an instant, and right away enjoy extra muscle for 3D flying and FAI F3C competition.

Developed directly from the feedback received from top FAI and 3D pilots throughout the world, the MAX 70SZ-H Ring produces copious quantities of power across the rev range without sacrificing its ability to perform precision hovering. There's a stronger crankcase (with 6-point mounts), 3-needle carburettor and a revised liner/port design to give you the performance you need to beat the world! Particularly suited to the demands of 3D flight