The searching for speed is resulting in very fast yachts but a maximum limit for speed seemed to be achieved. In order to provide an additional velocity, a better understanding of added resistance in waves is necessary. This facts point out the necessity of a deep research in the field of ship motion and added resistance in waves. The free running technique was already developed by the authors to determine motion characteristics and the upright and heeled resistance in still water and in waves for a sailing yacht with similar characteristics of a typical IACC. In this paper, an improved way of pulling the model was applied using rigid poles or lines to simulate the action of wind as well as springs to allow the free motion when the yacht was performing in waves. This provided free of motion and little interference between the linkage and the model itself. The forces and motions measured during the experiment are presented and they show consistence and a good trend. Also some theoretical calculation obtained through the Strip Method were used for comparison, showing the inherent limitations of this method and necessity of improvement.