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EcoNavis Solutions has begun production of its patented Eco Boss Cap propeller hub, marking the transformation of a university-led research project into an industry-ready fuel efficiency retrofit technology.
The first unit, destined for installation on a general cargo vessel, has been cast at a foundry in China using designs optimised entirely through computational fluid dynamics (CFD). It is currently undergoing final machining ahead of factory acceptance tests.
From research to production
The Eco Boss Cap eliminates the hub vortex cavitation that causes rudder erosion, vibration, and thrust loss in conventional propulsion systems. Unlike finned boss caps, which only function optimally at narrow speed ranges, the Eco Boss Cap features a smooth, conical design with internal chambers and strategically bored holes. This configuration uses fluid pressure differences to improve flow uniformity, reducing torque while increasing thrust across a wide range of operating conditions.
The innovation began as a research project at the University of Strathclyde, led by naval architect Dr Batuhan Aktas.
“We started by identifying the failure points of existing designs,” he said. “Fin-type caps tend to generate drag outside their designed speed. We wanted to create something simpler and smarter — a passive system that could dynamically adapt without complexity or cost.”
Initial CFD simulations showed performance gains of over 3% in efficiency and reduction in propeller hub vortex cavitation. But early prototypes revealed a critical problem: some hole placements actually reduced propeller efficiency. The team returned to first principles, iterating the design using advanced parametric optimisation tools.
The breakthrough came when engineers redesigned the internal chamber to align the suction flow with stagnation pressure points, allowing the cap to draw water through its core without impeding thrust. These insights led to successful trials at a European cavitation tunnel facility, where the final design outperformed other energy-saving caps.
Performance and cost advantage
Now under exclusive licence from the University of Strathclyde, the Eco Boss Cap is cast in a single piece, requires no moving parts, and can be installed in five to six hours during a normal drydocking.
“It costs about 50% less to manufacture than typical fin-based units and is expected to achieve a return on investment in under six months for mid-sized vessels,” said Amitavo Wye, EcoNavis’s Chief Operating Officer.
Early trials showed a 3.1% improvement in propeller efficiency, a 1.1% increase in thrust, a 2% reduction in torque, and a 10% decrease in rudder cavitation. Noise was also reduced by up to 3 dB, lowering the vessel’s underwater radiated noise footprint — a key issue for ESG compliance in sensitive marine environments.
“We’ve moved from lab to foundry in less than a year,” said Dr Aktas. “And with every unit, we’re refining not just our technology, but how fast and affordably we can deliver it.”