O.S. Max .32SX-H Ringed Helicopter Engine.

O.S. Max .37 SZ-H Ring Helicopter Engine. (Two year limited warranty)

O.S. Max .50 SX-H Ring Hyper Helicopter Engine with Hyper Cooling Head and 60LH Carburetor.

O.S. Max .91 SZ-H Ringed Helicopter Engine. This engine powered the 1st, 2nd and 3rd place finishers in the 2005 World Championships in Spain.

O.S. Max .91 SZ-H PH Hyper Helicopter Engine with Pump.

O.S. Max .91 RZ-H rear exhaust helicopter engine.

O.S. Max .91 RZ-H DH Rear Exhaust Helicopter Engine.