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• Wärtsilä 2-speed gearThe Wärtsilä 2-speed gear is designed to serve vessels having multipleoperational modes or reduced transit speed. In particular, RoPaxferries, offshore support vessels, tug boats and fishing vessels cangain notable economic and environmental benefits. Also single screwvessels with redundant propulsion system (“take me home system”)will benefit from this gear type.By operating the ship’s propeller at low speed when maximumvessel speed or propeller thrust is not required, fuel consumption canbe reduced by as much as 15 percent compared to a single mechanicalpropulsion system. At the same time, nitrogen oxide (NO X) and sulphuroxide (SO X) emissions are similarly lowered.Benefits• z Fuel consumption and exhaust gas emissions reduced• z Reliable performance with low transmission losses• z Acts as a systems enabler for vessels with variable operationalmodes and/or a need for a redundant propulsion system• z Two selectable propeller speeds at 100% engine speed• z Provides efficient utilisation of the main engine• z PTO power 100% of the engine power• z PTO power uninterrupted when changing propeller speed• z Reliable and simple to operate with mode changes from the bridge• z Lower noise levels for onboard comfort and ecological friendliness123