This engine is the O.S. MAX-160FX-FI (fuel injection) engine equipped with a revolutionary fuel supply system that was jointly developed by Futaba, a manufacturer of Radio control equipment, and O.S. Engines, a manufacturer of model engines. This system detects engine speed with a sensor based on throttle signals transmitted from a transmitter. It then determines the fuel injection volume based on the required amount of fuel to be supplied for that engine speed as calculated by an electronic control unit referred to as the "EC-2", after which fuel is injected into the engine from an injector. In addition, adjustments can also be made using dial on the transmitter. The result is an engine for Aerobatic and big scale models that features excellent engine speed linearity relative to throttle operation under all types of flight conditions.