MAN B&W Auxiliary Propulsion System. Ordinary propulsion mode
When operating in ordinary propulsion mode, the main engine delivers the propulsion power directly to the propeller shaft via the clutched-in Alpha Clutcher. PTO-power is delivered from the shaft via flexible coupling to the tunnel gearbox and the shaft alternator.
When switching from auxiliary propulsion mode, ordinary operation mode is re-established in five minutes. The main engine and the shaft alternator have to be stopped, when the Alpha Clutcher is activated for clutching in.
When the ship operates in ordinary propulsion mode, the Alpha Clutcher is mechanically locked. No parts are moving and the Clutcher is not exposed to internal wear of any kind. No hydraulic systems are required to maintain the Clutcher in position. No additional power consumption.