Working Principle

✦ Magnus Effect

DEALFENG Rotor Sail Technology is based on the utilization of Magnus effect to harness wind power to provide forward auxiliary propulsion for ship. When wind flow meets the spinning rotor sail, the air flow increase on one side of the Rotor Sail and decreases on the other side of the Rotor Sail. The change of the air flow speed results in a pressure difference, which causes a transverse force that is perpendicular to the wind flow direction. The thrust force created by rotor sails provides assisted propulsion to the ship and can be used to increase the ship speed or reduce the fuel consumption of the main engine. The same principle applies to all rotating spheres and cylinders, which phenomena such as curve balls in flight can be observed in table tennis or football.

✦ Rotor Sail Advantages

Compared with other types of wind assisted propulsion devices on the market, rotor sails offer a much greater thrust force to propel the ship per square meter of sail area with the features below:

✦ Market Size of Wind Propulsion

The European Union forecasts that there are as many as 10,700 wind propulsion system installations will be in place by 2030, while the UK Government's Clean Maritime Plan predicts that the global market for wind propulsion systems is estimated to be worth £2 billion a year by 2050, with around 30,000 vessels installed wind propulsion systems (equivalent to 40% -45% market penetration / roughly 40-45% of the global fleet). The use of these wind propulsion systems would then lead to CO2 savings of around 3.5-7.5 Mt CO2 in 2030 and the wind propulsion sector would then be good for around 6,500-8,000 direct and around 8,500-10,000 indirect jobs.

Source: DNV, BV

The secretary general of the International Wind Ship Association (IWSA) said that the rapid development of wind energy in the shipping industry in the next ten years will not only help the shipping industry reduce costs, but also help achieve the emission reduction targets of IMO 2050, and even realize the complete decarbonization (carbonization elimination) of the global fleet.