This is the O.S. Max .37 SZ-H Ring Helicopter Engine. (Two year limited warranty) FEATURES: Premium performance for 30-sized machines, from extreme aerobatics to stable hovering Same mounting pattern and muffler dimensions as the .32 SX-H, for ...

For over-the-top flying excitement, the 50SX-H Ringed Hyper engine is the clear favorite! The Hyper version weighs less than the 50SX-H, but delivers more horsepower for higher rotor speeds. Actually mounts in the same space as a .30-size application. The 60LH carburetor features 1.5 mm more bore...

The 55HZ Limited retains all of the performance features of the 55HZ-H Hyper, with a wicked appearance too! * This special version of the 55HZ-H is all black, with "2010 Heli Jamboree Edition" stamped on the engine and pipe. Plus, each engine and pipe are matched up at the factory with their own se...

The 55HZ Limited retains all of the performance features of the 55HZ-H Hyper, with a wicked appearance too! *********** The maneuvers in F3C competitions increase the level of performance these days not speak of 3D flight. This means the pilots demand more performance on its power source: engines....

The O. S. 55HZ-H Hyper Ringed Heli engine is cause to rejoice for 3D heli fliers! The 55-HZ-H Hyper Ringed engine cranks out optimum power with a minimum of space! The PowerBoost Pipe 50/55 is a first from O.S. – designed especially for helis, improving efficiency and power while featuring a compact...