Appendage design
General information
In addition to the design and development of optimised hull forms, MARIN is assisting the owner of the yard with the design of the appendages. Special attention has to be given to the optimum shape and the best alignment with regard to the direction of the flow.

Services & Activities
The Ships Department has a lot of expertise in the field of appendage design. For the design of a rudder, first the manoeuvrability of the ship has to be investigated. Additionally, the resistance and the cavitating characteristics of the selected rudder are checked by means of model experiments.
The optimum alignment of the bow thruster tunnels and the need for scallops can be determined by means of paint tests.
For twin screw vessels with a conventional shafting arrangement, the struts are aligned with regard to the flow angle by means of paint tests (plates on the struts) and for the high speed vessels by means of a 5-hole Pitot tube measurement at the plane of the struts.

Facilities & Tools
Model experiments to optimise the design of the appendages are carried out in the following MARIN facilities:

The following tools are used to study appendage design issues: (SURSIM and SHIPMO for MARIN internal use only)

Experience
The list below gives a review of ship types where MARIN has a large experience in the field of appendage design:

  • Motor yachts with a lenght varying from 8 to over 150m, and different propulsion type's
  • High speed ferry's and cruise liners, including twisted struts
  • Cargo vessels with a lenght varying from 80 to over 300m
Most recent appendage design related papers presented by MARIN
(complete overview of papers can be found under Publications)

Stereo Particle Image Velocimetry proves important tool in a wide range of test campaigns
Rink Hallmann, MARIN Report, 2017

MARINnovatief 2017 results in seven new exploratory projects
Timo Verwoest, MARIN Report, 2017

Free basin time for SME concept testing
Jaap de Wilde, MARIN Report, 2017

Computational Study On Power Reduction By A Pre-Duct For A Bulk Carrier
Schuiling, B., Windt, J., Rijpkema, D. R. and van Terwisga, T. J. C., Tokyo 2015, A Workshop on CFD in Ship Hydrodynamics, Tokyo, Japan, 2015

From fresh Breathe to hot Savannah
Enrico Della Valentina, MARIN Report, 2015

Most recent appendage design papers written for MARIN Report:
(complete overview of articles can be found under Publications)

Stereo Particle Image Velocimetry proves important tool in a wide range of test campaigns
Rink Hallmann, MARIN Report, 2017

MARINnovatief 2017 results in seven new exploratory projects
Timo Verwoest, MARIN Report, 2017

Free basin time for SME concept testing
Jaap de Wilde, MARIN Report, 2017

Computational Study On Power Reduction By A Pre-Duct For A Bulk Carrier
Schuiling, B., Windt, J., Rijpkema, D. R. and van Terwisga, T. J. C., Tokyo 2015, A Workshop on CFD in Ship Hydrodynamics, Tokyo, Japan, 2015

From fresh Breathe to hot Savannah
Enrico Della Valentina, MARIN Report, 2015

Contact
For more information on how MARIN can help your organisation with the issue of appendage design, please contact:

The knowledge group Resistance and Propulsion at powering@marin.nl

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