Experimental Data of Model-Ship Correlation about Manoeuvrability of a Wide-Beam Tanker

Abstract

Full scale manoeuvring tests were carried out to evaluate the steering quality of a wide-beam tanker. These results show that if a large wide-beam tanker has a large rudder which is enough to keep the course stability, the ship has similar performance to those of the conventional one. In order to study the scale effect upon manoeuverability, ship trial results are compared with those from free running model tests, in which three geosim models (4m,10m,30m in length) were used and following conclusions are obtained. (1) In the full load condition, there is only a small scale effect in the range of large amplitude motion. While in the range of small amplitude motion, models are more stable on course and much quicker in response to rudder. (2) In the ballast condition, the difference between models and ship is remarkable.