O.S. Engine OSMG1972 70SZ-H Ring 3D Heli Engine  [OSMG1972]

Performance Upgrade for 3D Helicopters: O.S. Engine OSMG1972 70SZ-H

For RC helicopter pilots aiming to lift their flying, the O.S. Engine OSMG1972 70SZ-H Ring 3D Heli Engine offers a straightforward upgrade into the footprint of a .61 motor, avoiding complex gearbox or frame changes. It pairs dependable output with tuning flexibility for both 3D sequences and FAI F3C routines.

Built for Stable High Performance

This engine is engineered for competitive use, with an added front mounting lug on the crankcase to improve stability under heavy loads. Front and rear ball bearings support the crankshaft to cut friction and extend service life during intense flight sessions.

Three-Needle Carburetor for Fine Tuning

The 70SZ-H features a three-needle carburetor that gives pilots fine control over low, mid and high speed settings. The throttle assembly is marked for reference so you can return to precise settings easily after maintenance or trim adjustments.

Robust Cooling for Long Runs

Heat control is handled by a large head with extensive fin area and reinforced webbing at the crankcase front to improve thermal transfer. These design choices help keep operating temperatures lower in extended or aggressive flying.

The O.S. Engine 70SZ-H suits pilots who want more performance without major airframe work. Its durability and tuning range make it a solid choice for serious hobbyists and contest flyers alike.