Merchant shipping operators face persistent fuel cost volatility, tightening emissions regulations, and the need to maintain vessel performance.
The Eco Boss Cap is a propeller retrofit for bulk carriers, container ships and tankers that helps reduce fuel consumption and operating costs while supporting CII and EEXI performance. It is designed for operational simplicity, with no fins, no moving parts, and retrofit options while afloat or during dry dock.
Independent testing demonstrated a 3.27% reduction in delivered power, which translates to fuel savings of 3–5% depending on vessel size and operating profile. For larger merchant vessels, return on investment is typically achieved within 6-12 months.
This makes the Eco Boss Cap a practical option for operators looking to improve efficiency, manage compliance risk and protect margins.
How the EcoBoss Cap improves Merchant Shipping Vessels
Propeller hub vortex losses cost money
Behind every propeller hub, inherent flow features forms a hydrodynamic phenomenon called propeller hub vortex cavitation (PHVC). PHVC waste fuel that could be powering the vessel forward. This hidden loss increases fuel consumption and may cause erosion on rudder. The Eco Boss Cap recovers this lost efficiency by optimising flow behind the hub. Unlike fin-based solutions, it does this without adding blade appendages or operational complexity. Our bespoke design approach ensures the Eco Boss Cap is engineered to suit the vessel’s existing rudder arrangement, with compatibility assessed through vessel-specific analysis to maintain normal operational requirements. The result is improved fuel efficiency delivered through a robust, low-risk design.
Proven performance on merchant vessels
Operational data from installed ships confirms:
- 3.27% fuel consumption reduction
- 3.7% delivered power reduction under controlled test conditions
- Consistent performance across varying operational profiles
Designed to fit real operations
Any retrofit must work around operational constraints. The Eco Boss Cap can be installed while afloat or during scheduled dry dock, allowing installation to align with existing maintenance plans. No hull modifications are required, and no changes to the wider propulsion system are needed. With no fins and no moving parts, the design is well-suited to day-to-day merchant shipping operations and reduces exposure to in-service damage or additional maintenance.
Meeting CII requirements
Efficiency improvements increasingly influence CII ratings and charter attractiveness. By reducing delivered power and fuel consumption, the Eco Boss Cap supports improved performance against CII and EEXI requirements, helping operators manage compliance risk without operational disruption. Lower fuel consumption leads to reduced CO₂ emissions as a direct result of improved efficiency.
Fuelsavings
Up to 5% reduction in fuel consumption.
Measuredperformance
3.27% reduction in delivered power demonstrated in independent testing.
Return oninvestment
Typical payback achieved within 5–8 months, depending on vessel type and profile.
Operationalsimplicity
No moving parts. No fins. Retrofit while afloat or at dry dock.
Technical information
Detailed technical validation, CFD results and independent test data are available for naval architects, technical managers and procurement teams.