The OS MAX 91SZ-H Ring PS-Hyper Engine has a crankcase specially designed for helicopter use that ensures high rigidity and stable power though out the full power range. O.S.’s original PD-07 pump and regulator system ensures stable flight through out all 3D maneuvers where the fuel level can vary significantly. A carbon material is used for pump isolation plate which reduces heat conduction and vibration to the pump. The new 60M-P carburetor with twin mixture needles has the regulator incorporated as part of the carburetor. The large blue anodized, machined, heat-sink head effectively radiates excessive heat. A Laurel design has been laser marked on the top to symbolize victory.