Becker Twisted Fin

The Becker Twisted Fin® is a hydrodynamic energy-efficiency solution that is mounted in front of the propeller to optimize the flow of water from the hull to the propeller. By directing and stabilizing the stern flow, it reduces the energy losses that would otherwise occur when the propeller operates in an uneven inflow. The result is improved propulsion efficiency, lower fuel consumption, and reduced emissions. Unlike a nozzle solution, the Becker Twisted Fin® consists of a twisted hydrodynamic fin optimized to interact with the propeller flow. The fin’s geometry is tailored to each vessel’s hull shape, propeller, and operating profile to create a more uniform inflow to the propeller and reduce vortex formation in front of the propeller disk.

Each Becker Twisted Fin® is individually sized using CFD simulations and model tests. The solution can be installed both on newbuilds and as a retrofit during routine dry-docking and is primarily used on vessels where the hull shape provides favorable conditions for hydrodynamic optimization.

How does the Becker Twisted Fin® work?

When water flows past a ship’s hull, vortices and irregularities form in the wake before the water reaches the propeller. This means that the propeller blades are subjected to varying loads with each revolution, which reduces the propeller’s efficiency and can cause vibrations, cavitation, and unnecessary energy losses. The Becker Twisted Fin® influences the water flow even before it reaches the propeller. The twisted fin directs the stern flow in the correct direction and reduces the vortices that would otherwise impair the propeller’s operating conditions. A more even inflow allows the propeller to operate more efficiently while distributing the load on the propeller blades more evenly. In addition to improved energy efficiency, this solution can also contribute to lower vibration levels, reduced cavitation, and improved ride comfort.

When is the Becker Twisted Fin® suitable?

The Becker Twisted Fin® is designed for vessels with relatively slender sterns and higher service speeds, where the propeller’s efficiency is affected by the stern wake.

The solution is particularly well-suited for:

Container ships
Car carriers
RoRo ships
RoPax ships
Passenger ships
LNG and LPG ships
High-speed merchant ships

On these vessels, the Becker Twisted Fin® can deliver significant energy savings and contribute to improved EEDI, EEXI, and CII ratings. The actual savings depend on the interaction between hull shape, propeller, and operating profile, but model tests and full-scale installations typically show fuel savings of up to about 4%.

Benefits of the Becker Twisted Fin®

Optimizes water flow in front of the propeller.
Reduces vortex formation in the wake.
Improves propulsion efficiency.
Can reduce fuel consumption and emissions.
Contributes to lower vibrations and reduced cavitation.
Customized using CFD simulations and model testing.
Suitable for both new construction and retrofits.
Has no moving parts and requires virtually no additional maintenance.