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 DRS is developed for supplying ideal air-fuel mixture as pilots desire. A fuel tank is pressurized by the pressure from the nipple in the back plate via one-way valve so that the fuel is pumped to the regulator. The regulator picks up the negative pressure created in the venturi and supplies fue...

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...