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Using the latest CFD-methods, parameters were found, that enables a significant improvement in bollard pull and at the same time reducing the nozzle resistance at free running speeds.
The solution was found by designing the interior surface of the nozzle for maximum bollard pull, whereas the exterior surface was optimized for high free running efficiency. The nozzle design optimization was performed for the complete propulsor, i.e. including also the underwater part of the propulsion unit itself.
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The application of a nozzle increases the thrust at relatively low ship speeds. Significant savings in fuel consumption can be achieved depending on the number of revolutions and the capacity of the engine. Nozzles are aerofoil shaped rings placed around the propeller.
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Propeller Design
All ships have individual needs. Speed is important for some ships. Towing pull is more important for others. To satisfy these needs Finnøy use the most suitable software together with Finnøys knowledge when designing propeller blades. The propeller blade is designed for best possible performance regarding thrust, efficiency, noise and vibration. The blades are ground and balanced according to ISO 484 standards.
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