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

Gain Precise Power with the O.S. Engine OSMG1972 70SZ-H

Hobby flyers looking for a direct .61 replacement will find the O.S. Engine OSMG1972 70SZ-H Ring 3D Engine easy to fit without major gearbox changes. It delivers the responsiveness and consistency required for advanced 3D flying and FAI style competition.

Durable Design for Aggressive Manoeuvres

The engine's layout suits high stress flying, featuring an extra mounting lug at the front of the crankcase to help resist torque movement. Front and rear ball bearings support the crankshaft to reduce wear during repeated aggressive flights.

Fine Adjustment with a Three-Needle Carburettor

With a three-needle carburettor, the 70SZ-H lets pilots dial in idle, mid and top-end fueling accurately. The marked throttle linkage makes it straightforward to record and return to precise settings after servicing.

Engine Cooling Built for Continuous Use

Cooling is handled by a large head with extensive fin area, while added crankcase webbing at the front increases heat transfer away from hot components. These features keep temperatures under control through long flying sessions.

Overall, the 70SZ-H is a practical route to higher performance for pilots who need reliable power and precise tuning without heavy airframe changes.