Lloyd's Register (LR) has completed an independent verification and assessment of computational fluid dynamics (CFD) analysis for SunRui’s suction sail technology.
Announced at SMM 2026 in Hamburg, the verification reflects a growing industry focus on independently validated performance data as owners assess technologies that can improve vessel efficiency, reduce fuel consumption and support compliance with evolving environmental regulations.
LR's review examined the aerodynamic performance and wind load calculations for SunRui's 6m x 26m suction sail. The assessment confirmed that the CFD study was conducted in accordance with recognised industry standards, including LR's Guidance Notes on Wind Assisted Propulsion Systems (LR-GN-044), IACS Recommendation 173 and relevant ITTC CFD procedures. Following its review, LR concluded that the proposed CFD analysis was based on satisfactory standards and could be accepted.
The study assessed by LR reported a maximum thrust of 260kN for a single suction sail and a maximum combined thrust of 700kN in simulations involving three sails operating in a ship-sail configuration. These results provide further insight into the potential contribution wind-assisted propulsion technologies can make towards improving vessel efficiency.
Rob Tustin, North Asia New Construction Manager, LR, said: “Independent verification has an increasingly important role to play in building confidence in performance predictions and supporting investment decisions. Owners need assurance that projected benefits are based on robust engineering methodologies and recognised standards.
“It helps provide a trusted foundation for evaluating new technologies, enabling stakeholders to make informed decisions to improve energy efficiency and reduce emissions.”
A SunRui spokesperson said: “Independent verification by Lloyd's Register provides valuable assurance that our analysis has been reviewed against internationally recognised standards. This milestone reinforces confidence in the technical basis of our suction sail technology and supports its application as shipowners continue to explore proven energy-saving solutions.”
