The rotor sail manufactured by Zhongfu Lianzhong ready to go to sea

The Chinese company specialized in the development, design and production of composite materials products Lianyungang Zhongfu Lianzhong Composite Materials Group Co., Ltd. (Zhongfu Lianzhong), a subsidiary of China National Building Material Group (CNBM), has seen its rotor sail successfully installed. This marks the birth of the world’s first rotary sail bulk carrier with a diameter of 5 meters and a height of 35 meters, according to Zhongfu Lianzhong.

The rotor sail manufactured by Zhongfu Lianzhong ready to go to sea

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As a new type of propulsion device, the rotor sail can adjust the speed according to the wind direction at any time to take full advantage of the wind force; compared to the traditional sail, it takes up less space on the deck and is less affected by strong winds. Its principle of energy saving comes from the Magnus effect. The rotating drum sail generated by the motor has friction, which causes the surrounding air to spin. When a side wind blows, the airflow speed on one side of the fan increases and the airflow speed on the other side slows down. The faster the fluid flow, the lower the pressure. The flow field around the rotating fan will generate a pressure difference, which will provide thrust allowing the vessel to move forward.

Relying on strong technical capabilities and rich experience in composite material design and production, Zhongfu Lianzhong cooperated closely with British technology companies to become the first Chinese company to develop the first set of rotor sails with independent intellectual property rights. In the manufacturing process of the sail, the cluster-type dry-wet lamination winding molding technology was adopted to realize the preparation of large-scale high-precision rotor sails with complex forces. According to calculations, the application of this technology can achieve a fuel saving of more than 15%, and a single ship on a specific route can save 642 tons of fuel, reducing carbon emissions by 2,058 tons. Currently, Zhongfu Lianzhong has built two production lines to mass produce rotor sails.

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