EcoNavis Solutions has completed retrofit installation of its Eco Boss Cap to a second vessel operated by Thailand-based Kaizen Ship Management.
The successful installation marks the first repeat order for the energy-saving propeller technology since market introduction in 2025.
The latest retrofit, carried out on the 32,491 dwt bulk carrier YC Fortitude, follows the July 2025 installation on the 31,807dwt general cargo ship SYFC Araya. After six months of operation the ship manager reported fuel savings in the 2.2% to 2.5% range. The decision to install the novel propeller hub to a second vessel was based on measured performance improvements observed in service, alongside internal verification across different loading and operational profiles.
Kaizen Ship Management MD Kishen Dev Singh said: “SYFC Araya demonstrated consistent fuel savings. Based on what we have observed from the first installation, we were confident in proceeding with a second vessel and are evaluating further applications across the fleet.”
Both installations were completed during drydock at a Chinese yard, following successful factory acceptance testing. Eco Boss Cap casting and machining was carried out by EcoNavis’ partner Zhenjiang Supersoar Marine Propulsion, with the project taking three months to complete from order confirmation to installation.
The Eco Boss Cap is designed to mitigate propeller hub vortex cavitation, a known source of propulsion and energy efficiency loss, through a patented configuration of internal chambers and flow passages that modify pressure distribution at the propeller hub. Unlike conventional fin-based devices, each Eco Boss Cap is bespoke, designed for the individual vessel to which it will be installed using parametric modelling and computational fluid dynamics (CFD) optimisation. While the overall external geometry remains broadly consistent, flow characteristics are refined to maximise efficiency gains for each vessel’s specific profile.
For YC Fortitude’s 5260mm diameter four-blade fixed pitched propeller, EcoNavis undertook a vessel-specific optimisation process to account for differences in propeller loading patterns and operating conditions compared with the first installation.
Dr Batuhan Aktas, Founder and CEO, EcoNavis Solutions, said: “What is particularly significant is that the customer has observed measurable improvements within a relatively short operational period. Detecting efficiency gains at this level typically requires extensive long-term data, so the fact that Kaizen has been able to verify performance and proceed with a second installation within months is a strong indicator of the technology’s effectiveness.”
Aktas said that Kaizen Ship Management’s focus on acquiring and upgrading older vessels through targeted efficiency improvements, provides a suitable platform for retrofit technologies such as the Eco Boss Cap. The company has indicated that it is considering further installations, with up to three additional vessels under evaluation as part of its ongoing fleet enhancement programme. EcoNavis estimates that the Eco Boss Cap can deliver up to a 5% improvement in propeller efficiency depending on vessel type and operating conditions, with typical fuel savings in the 2 to 4% range and a return on investment achievable within a relatively short period.
Image: An Eco Boss Cap being retrofitted to a second Kaizen bulk carrier at a CSSC shipyard in China (source: EcoNavis Solutions)
