Accurately predicting the benefits of Wind Assisted Ship Propulsion demands more than simplified estimates. By combining high-fidelity CFD, surrogate modelling, power prediction and weather routing, this methodology quantifies fuel savings, CII impacts and return on investment. The findings reveal why precision analysis is becoming essential for maritime decarbonisation efforts worldwide.

Retrofitting rotor sails onto bulk carriers is proving that wind-assisted propulsion can deliver practical decarbonisation benefits, but successful deployment depends on overcoming complex integration and compliance challenges. Drawing on real-world installations across multiple vessel classes, this research highlights critical lessons for designers, manufacturers and classification societies seeking to scale wind propulsion safely and efficiently.

Flettner rotor technology is advancing rapidly as a viable wind-assisted propulsion solution for maritime decarbonisation. Drawing on high-Reynolds-number wind tunnel testing, this research reveals how rotor geometry and endplate design influence aerodynamic performance. The findings provide valuable guidance for optimising lift generation, improving fuel-saving potential and enhancing future wind-assisted ship propulsion systems.

Understanding how keel design affects wind-powered vessel performance is becoming increasingly important for maritime decarbonisation. Combining towing-tank experiments, Particle Image Velocimetry and digital ship modelling, this research reveals how bilge and fin keels influence hydrodynamic efficiency, vortex behaviour and propulsion performance, delivering valuable insights for future optimisation and sustainable design.

A novel wind sail using CoFlow Jet active flow control could significantly advance wind-assisted propulsion by delivering exceptionally high lift without rotating components. Combining advanced CFD modelling with route-based economic analysis, the technology demonstrates strong fuel-saving potential, reduced emissions and attractive payback periods, highlighting a promising pathway for maritime decarbonisation at scale.

Wind Assisted Propulsion Systems are gaining momentum as a practical decarbonisation solution, but confidence in real-world performance remains critical. Leveraging operational vessel data and innovative on/off testing methods, this research examines how fuel-saving benefits can be measured with greater accuracy, reducing uncertainty and helping operators make more informed investment and deployment decisions.

Advanced wind sensing could unlock greater value from Wind Assisted Propulsion Systems by ensuring sails respond to actual local wind conditions rather than relying solely on conventional bridge-mounted measurements. By evaluating technologies such as LiDAR, fibre-optic sensors, pressure sensing and enhanced anemometers, this research demonstrates how more accurate wind data can boost propulsion efficiency, increase fuel savings and support load monitoring, improving both operational performance and long-term system reliability.

The paper consists of two parts. The first part provides a transparent methodology to estimate the net propulsion fuel consumption savings when using a WAPS. The savings can be calculated by vessel performance simulations for specified voyage or for past routes in specified timeframe. The methodology principles are applicable to rotor sails, hard sails,

The CREATOR methodology is advancing holistic ship design by integrating wind propulsion, hydrodynamics and propulsion optimisation within a flexible Python-based framework. Applied to a Newcastlemax bulk carrier with rotor sails, the approach identifies optimal configurations, quantifies efficiency gains and reveals how multidisciplinary digital design can unlock greater performance from wind-assisted shipping.

Wind-assisted propulsion is moving beyond hardware innovation to address a critical design challenge: aerodynamic interference between multiple sails. Using a bespoke modelling approach calibrated with CFD and wind-tunnel data, bound4blue has developed a rapid simulation tool that optimises eSAIL® configurations, enabling more accurate performance prediction, efficient vessel integration and enhanced fuel-saving potential.

Machine learning is accelerating Windship design by bridging the gap between simplistic hydrodynamic models and computationally intensive simulations. Using neural-network surrogate models trained on diverse hull forms, researchers can rapidly predict forces, moments and wake characteristics with near-CFD accuracy, enabling faster optimisation, performance assessment and early-stage integration of wind propulsion technologies.

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Intellectual property is becoming a critical differentiator in the rapidly expanding wind propulsion sector. As innovation accelerates across sails, rotors, control systems and integration technologies, effective IP strategies can help developers secure investment, protect competitive advantage and strengthen market position. This paper explores patent trends and practical approaches to managing, protecting and commercialising wind propulsion innovations in an increasingly competitive maritime market.

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