This paper describes the results of flow field measurements around a high-speed type fine ship model at incidence. The measurements were made by using a robot system for flow measurements in a circulating water channel with 5-holes Pitot Tube. A number of velocity data were obtained in both face and back side region of the ship, and around the skeg. The detailed measurement and analysis around skeg at stern shows that the physical structure of the separated vortex from skeg in the back-side region is quite different from the vortex due to the bilge keel, which is the so-called typical longitudinal vortex.
