Paper 13. Manoeuvring Research at Admiralty Experiment Works Using Free-Sailing Models

Since June 1969 the Admiralty Experiment Works has been engaged in an investigation that is aimed at improving our knowledge of the facts affecting the yaw-motion stability of surface ships. The programme has involved extensive use of self-propelled, free-sailing models plus full-scale data from trials carried out by ships' officers and reported through the fleet organization. This paper will deal with the free model work to date and outline some of the questions raised, as well as information gained.