The 55HZ-R DRS engine is designed to meet the unique demands of F3C competition and 3D flight! The Demand Regulator System (DRS) uses pressure to consistently deliver the optimal air-fuel mixture to the engine — regardless of the heli's attitude Two needles on the...

This is the 105HZ DRS 1.05 cu in Helicopter Engine from O.S. Engines. **Additional Technical Info Will Be Added When It Becomes Available.** FEATURES: Same mounting dimensions as a .90 cu in engine Machined blue anodized aluminum heatsink cylinder head Velocity stack increases airflow...

This is the OS 55HZ Hyper Ringed Helicopter Engine with the 40L Carburetor.     Best suited for 3D flight! Amazing power equal to 60 size engine changes the common knowledge of the 50 size helicopter engines! It can be installed in the 50...

Following the popularity of the 91HZ-R with On-Demand Regulator, O.S. has now taken high-performance, high-speed helicopter engines to the next stage of evolution. Introducing the 91HZ-R Speed Engines - based on the 91HZ-R, factory-tuned at the O.S./Japan facilities and guaranteed to blow you away!...

This is the 105HZ 1.05 cu in Helicopter Engine from O.S. Engines. **Additional Technical Info Will Be Added When It Becomes Available.** FEATURES: Same mounting dimensions as a .90 cu in engine Machined blue anodized aluminum heatsink cylinder head Velocity stack increases airflow and...

OS Power Boost Pipe GT15HZ : 72148000 Pipe Length: 260mmWeight: 376gSuitable Model: GT15Z Helicopter