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.