Dual fluid interacting propulsion system for a vessel

A method for controlling an operation condition of a vessel, in a sustainable emission free condition, the vessel generating a resisting drag power when moving, comprising:

• a hydrodynamic spinning actuator comprising blades, configured to work in a propeller mode and in a water turbine mode,
• a pitch control mechanism of the hydrodynamic spinning actuator blades and an orientation mechanism configured to orient a spinning axis of the hydrodynamic spinning actuator blades,
• a hydro-powerplant configured to convert an incoming hydrodynamic power of the hydrodynamic spinning actuator operating in the water turbine mode into electricity and to supply an outgoing hydrodynamic power to the hydrodynamic spinning actuator operating in the propeller mode,
• a power sail comprising 2 blades spinning around a power sail spinning axis and configured to operate in a sail mode, in a wind turbine mode and in an air propeller mode,
• an aero-powerplant configured to convert an aerodynamic incoming power from the power sail operating in the wind turbine mode into electricity and to supply an outgoing aerodynamic power to the power sail operating in the air propeller mode,
• a pitch control mechanism of the power sail blades and an orientation mechanism configured to orient the power sail spinning axis,
• an onboard battery configured to supply and to receive a battery power,
• an electrical power line connecting the hydro-powerplant, the aero-powerplant and the onboard battery,
• a plurality of sensors comprising, a vessel speed sensor, an apparent wind direction sensor and an apparent wind velocity sensor;
• a control center,
• wherein the operation condition comprises 4 domains:
• a first domain wherein the hydrodynamic spinning actuator and the power sail are operated in the propeller mode, supplied by the onboard battery,
• a second domain wherein the hydrodynamic spinning actuator is operated in the propeller mode and the power sail is operated in the wind turbine mode,
• a third domain wherein the power sail is operated concurrently in the sail mode and in the wind turbine mode and the hydrodynamic spinning actuator is operated in the water turbine mode,
• a fourth domain wherein the power sail is operated in the propeller mode, and the hydrodynamic actuator is operated in the water turbine mode,
• wherein for each domain a sum of the aerodynamic incoming power and the hydrodynamic incoming power minus the drag resisting power, the outgoing aerodynamic power and the outgoing hydrodynamic power equals the battery power,
• the method comprising steps of:
• i) acquiring a performance mapping of the vessel,
• ii) acquiring, from the sensors, a true wind direction and a true wind speed
• iii) setting a ship speed setting point, and
• iv) setting at least one parameter among a power sail orientation, a power sail spinning speed, a power sail blades pitch, a hydrodynamic spinning actuator spinning speed and blades pitch and a hydrodynamic spinning actuator orientation according to the performance map so that the operation condition is laying in a sustainable part of the second, the third and the fourth domain, wherein the onboard battery receives a battery power equal or more than 0.