O.S. Engine OSMG1977 91HZ-PS 3D Ring Helicopter Unit  [OSMG1977]

Key Traits of the O.S. Engine 91HZ-PS 3D Ring

The O.S. Engine 91HZ-PS 3D Ring is engineered to provide steady power delivery and controllable throttle response for demanding 3D flight. Its components are chosen to maintain consistency during rapid throttle transitions.

Stable Fuel System with PD-08 Pump

The horizontal regulator redesign and PD-08 fuel pump combination keeps fuel pressure stable through extreme attitudes. This helps prevent power loss during aggressive verticals and rapid direction changes.

Refined Internal Balance for Cleaner Operation

The piston and crank assembly are shaped to reduce internal vibration while preserving torque output across the rpm range, improving pilot feedback and control precision.

Efficient Cooling Fit and Carburettor Heat Shielding

The narrow heat sink head allows close fitting inside cooling shrouds to maintain ideal engine temperatures without compromising airflow. The 61B-PII carburettor's thermo insulator cuts down heat migration into the fuel path.

For pilots who tune for peak 3D control, the O.S. Engine 91HZ-PS 3D Ring delivers the stable fueling and reduced vibration that support precision flying sequences.