Anemoi Develops New Method to Accurately Measure Wind-Assisted Propulsion Benefits

Anemoi Marine Technologies has introduced a new method for verifying the performance of wind-assisted propulsion systems, aiming to simplify adoption and reduce costs for vessel operators. The in-service testing approach, validated by Lloyd’s Register Advisory, promises improved accuracy over current verification practices without the need for disruptive sea trials.

The technique involves toggling the wind-assisted propulsion system on and off during regular voyages and under varying environmental conditions. This generates comparative data, which is then used to calibrate performance predictions related to the rotor sail system. The resulting model enables reliable estimates of fuel savings, which can be applied either in real time or for specific voyages.

The methodology is detailed in a new whitepaper titled Performance Verification of Wind-Assisted Ship Propulsion Systems by On-Off Testing. Importantly, the system is applicable across all types of wind-assisted propulsion solutions, not just Anemoi’s proprietary Rotor Sails. It addresses the limitations of conventional standards, such as ISO 19030, which typically require controlled sea trials or take ships off hire—an expensive and logistically challenging option for many shipowners.

Lloyd’s Register Advisory confirmed that Anemoi’s approach not only avoids such disruptions but also improves the accuracy of fuel savings forecasts, offering a practical solution for ship operators seeking to measure and validate emissions reductions in line with decarbonization goals.

The model can be employed throughout a vessel’s operational life, supporting the development of advanced tools to predict fuel and power savings across diverse shipping conditions. This has the potential to enhance confidence in wind-assisted technologies and accelerate their integration into mainstream commercial shipping. The methodology was tested on the TR Lady Kamsarmax, a vessel outfitted with three Anemoi Rotor Sails measuring 5 meters in diameter and 24 meters in height. After a year of multi-voyage analysis, the ship achieved average net propulsion fuel savings of 9.1 percent, translating to a reduction of approximately seven tonnes of CO2 equivalent per sailing day.

Tags: CleanShipping, FutureOfShipping, GreenMarineTech, MaritimeInnovation, RotorSails, ShipDecarbonization, SustainableShipping, WindAssistedPropulsion
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