Becker Mewis Duct® – How does it work?
High blocked ships have low propulsion efficiency. The reasons for
this are the bad wake field and high propeller loading. Water inflow has
such an unfavourable characteristic that the propeller must operate in
bad inflow conditions. The Mewis Duct® harmonizes and stabilizes the
flow and generates a pre-swirl to reduce rotational losses in the
propeller slipstream.
The integrated fins have a stator effect by generating a pre-swirl
counter to the direction of propeller operation. This generates more
thrust. The fins are asymmetrically profiled and arranged to generate a
perfectly homogenous flow distribution. Consequent propulsion
improvement can only be achieved if several aspects of hydrodynamic
performance are taken into account. The combination of the Mewis Duct®
and a corresponding Becker Rudder dramatically increases the efficiency
of the system by means of wake field optimisation and less rudder
resistance at improved manoeuvring performance.
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