Stone Marine Propulsion: Advanced Propeller Technology for Maximum Efficiency
#stonemarine #propeller #npt
Stone Marine Propulsion, founded in the 1830s, is a global leader in advanced propeller technology. As part of Langham Industries and based in the UK, it remains the only propeller manufacturer worldwide to offer a complete range of propellers for all vessel types. Their high-performance propellers serve ships across sectors, including Container ships, Bulk carriers, Gas carriers, Tankers, Drillships, and Naval ships, with sizes ranging from 4.7m to 10.5m in diameter.
Technical Highlights:
New Profile Technology (NPT): Since 2007, over 200 NPT propellers have been supplied, marking the most advanced design in the industry. NPT, optimizes lift/drag properties, resulting in a smaller diameter optimum propeller, decreases weight and inertia. The NPT design also cuts fuel consumption, lowers pressure pulses, reduces cavitation, and minimizes noise.
Stone Marine Cap Fin:
Integrated with the propeller, this cap fin boosts efficiency by an additional 1–2%, converting slipstream rotational energy into thrust and reducing rotational losses. This combination yields a 2-6% efficiency gain, with a significantly lower cost and environmental impact.
Retrofit Compatibility:
The propellers are designed for direct retrofit as a cone cover replacement, achieving fuel efficiency without major modifications.
Design Optimization:
Customized for each vessel via Computational Fluid Dynamics (CFD) modeling, Stone Marine design complies with EEXI and CII standards, reducing required power curves and adjusting reference speeds. The NPT is also compatible with other efficiency-enhancing technologies, such as air lubrication and pre-swirl fins, offering further potential gains.
Recycling Value and Payback of Existing Propellers:
By recycling the existing propeller, Stone Marine can offset a significant portion of the cost of a new propeller. This approach reduces the overall investment required for the new propeller, making it a cost-effective solution and a fast payback. Through the recycled material’s value, you can achieve substantial cost savings while upgrading to advanced, more efficient propeller technology, reducing power demand
