Abstract
Using a ship model with azimuthing propellers (PODs) which are arranged in parallel at stern part, captive model tests were carried out to investigate the effect of POD strut profile area and the effect of stern fins on the hydrodynamic force characteristics related to ship maneuvering. The subject ship was unstable for course keeping.With increasing the strut area, ship control forces due to POD steering increase and the course stability of the ship was improved. Thus, the strut area is important for the performances of both ship control force and course stability.Stern fins were also useful for improving the course stability. However, effective control forces were reduced about 15% by attaching the stern fins. This is due to decrease of additional lateral force component acting on the hull induced by POD steering. Improvement of the course stability of the subject ship was insufficient by enlarging the strut profile area and attaching the stern fins. Further investigations are needed.
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