> Viking Line installed similar 80-foot rotor sail on a LNG powered Cruise Ferry on the route between Helsinki-Stockholm. Turku - Stockholm, actually. > The b

> Viking Line installed similar 80-foot rotor sail on a LNG powered Cruise Ferry on the route between Helsinki-Stockholm. Turku - Stockholm, actually. > The best way to reduce energy consumption for a ship is to reduce the speed and make thinner ships. Do you mean thinner as in narrower, or thinner materials to save weight? If you mean narrower, I've understood bigger ships tend to have a length/width ratio of about 6:1, as a rule of thumb compromise between seakeeping ability, fuel consumption, cargo space etc. Do you have some more information about design tradeoffs going into such narrower ships? > New cargo ships optimized for slow speed don't have the bulbous bow because it does not increase efficiency in lower speeds. Oh, interesting! Any links for further reading on this topic?