Tunnel Thrusters for Offshore Operations: Precision in Motion

View profile for Rodrigo Muylaert

International Sales Manager High-Speed Marine Propulsion Azimuth, CPP/FPP & Waterjet Global Offshore Projects Retrofit Hydrogen-Ready & Dual-Fuel Solutions Renewable Energy Decarbonization Certified Yachtmaster

Tunnel Thrusters & DP Operations: Silent Control with propper Ducted Propellers. In offshore operations, precision is not optional — it’s the standard. Tunnel thrusters fitted with ducted (nozzle-type) Kaplan CPP provide high thrust at low speeds for responsive lateral movement, station-keeping accuracy, and tight maneuvering — even under adverse conditions. The nozzle improves bollard-pull efficiency, reduces tip-vortex losses, and stabilizes inflow close to the hull. Critical detail — blade-to-tunnel tip clearance. Efficiency and acoustic performance depend on keeping the gap between blade tip and tunnel exactly as specified by the OEM manual. Clearances set too small raise the risk of contact, vibration, and cavitation; too large and the jet weakens, recirculation increases, and bollard-pull drops. Maintain concentricity and alignment under load, account for coating thickness and deformation, and inspect regularly to preserve the design clearance. Design notes for DP excellence • Kaplan geometry with controllable pitch for fine thrust resolution at low speed • Entrance radius and exit flare of the tunnel to minimize losses • Variable-speed electric drives integrated with DP control laws to reduce acoustic footprint Because holding position isn’t about power — it’s about precision in motion. #TunnelThrusters #KaplanCPP #DynamicPositioning #DuctedPropeller #BollardPull #Hydrodynamics #NoiseControl #MarinePropulsion #OffshoreOperations #VesselPerformance #NavalArchitecture #SustainableShipping

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