Abstract
Captive model tests were carried out to capture the hydrodynamic force characteristics of a ship with the azimuthing propellers (hereafter we call the ship Podded ship) which are arranged in parallel at stern part. The measured hydrodynamic force characteristics were compared with those of usual ship model with twin propeller and twin rudder. The Podded ship has better performance with respect to ship control force in case of large azimuthing angle. However, the course stability becomes worse. Comparing push and tractor types of azimuthing propeller,tractor type is superior to performance for both ship control force and course stability. Based on the measured results, a simulation model was developed for hydrodynamic forces related to azimuthing propellers. Using the model,maneuvering simulations were carried out for the Podded ship and usual ship with twin rudder. As a result, it was shown that the Podded ship does not keep to IMO criteria of 10/10 zig-zag maneuvers, even though the usual ship is no problem. It is necessary to pay attention to ensure the course stability in the new development of Podded ships.
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