OS Engines O.S. Max 70Sz-H Ring

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.