Bound4blue has completed its second eSAIL installation for Maersk Tankers, with four 24-metre suction sails fitted on the MR tanker Maersk Tahiti at Chengxi Shipyard in Jiangyin, China.

The work forms part of an agreement covering 20 units across five medium-range tankers. The first retrofit in the series was completed in January on board Maersk Trieste.

The 29,445-gt Maersk Tahiti is now equipped with four non-ATEX eSAILs designed to deliver double-digit fuel savings, cut emissions and improve Carbon Intensity Indicator (CII) performance.

José Miguel Bermúdez, chief executive and co-founder of bound4blue, said: “The agreement with Maersk Tankers reflects the wider scaling up of wind power adoption across the industry. Wind, and particularly suction sail technology, delivers massive advantage in both environmental and commercial contexts, and appreciation of this reality is blossoming.”

The system works by drawing air across an aerodynamically optimised surface to generate lift. bound4blue says this can produce up to seven times more lift than conventional rigid sails of the same size, reducing engine load and helping simplify compliance with FuelEU Maritime, EEDI/EEXI and EU ETS requirements.

The Spanish wind-propulsion specialist added that the units are fully autonomous, straightforward to fit and require limited upkeep.

The latest retrofit follows bound4blue’s earlier installation of four eSAIL units on Maersk Trieste, the first Maersk Tankers ship to be fitted with the wind-assist system.

Founded in 2014, bound4blue is headquartered in Cantabria, Spain, with offices in Barcelona and Singapore. Since completing its first installation in 2021, the company has deployed its eSAIL system on eight ships, with 11 more in its order book, representing more than 50 eSAILs.