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b4b’s goal is to establish the basis, based efficiency and cost savings criteria, to include the propulsive systems based on the use of wind as a standard in the global shipping industry. Nowadays our society is widely dependent on the use of fossil fuels and new technologies shall be developed to enable our society to use clean, alternative sources of energy. b4b appears as a solution to the need for new maritime propulsive systems economically competitive, sustainable and independent from hydrocarbon. Our rigid wingsail system provides a valuable and differential contribution bacause it generates an extra thrust, which reduce the amount of thrust of the main engine of the ship, reducing its fuel consumption and pollutant emissions.