DNV has granted a Type Approval Design Certificate (TADC) to CMES-Tech for its new 5 m × 35 m tilting rotorsail system, the first China-developed rotor sail to be approved under DNV’s wind-assisted propulsion rules.
The technology can tilt or fully retract, allowing it to avoid deck equipment, cranes, or low port structures during cargo operations. Sensors and automatic controls adjust how the system operates depending on real-time wind conditions, helping improve fuel savings while maintaining safety.
Dr Huang Guofu, General Manager of CMES-Tech, said: “Receiving the DNV TADC is a landmark for China’s green-shipping industry and a strong validation of our design’s maturity, structural integrity and operational practicality… We look forward to working with DNV as we continue to innovate.”
DNV said its review covered the mechanical, structural and electrical design, confirming the system meets its WAPS standard.
Chen Keng, DNV Vice President and Area Manager China South, said: “With increasing demand for energy-efficient and emission-reduction solutions, WAPS technologies offer immediate, tangible benefits to shipowners… We congratulate CMES-Tech on this achievement.”
The prototype has also passed a 120% overload structural test. CMES-Tech will now plan installation and sea trials.
