The performance of an ice-going vessel is usually measured as the maximum ice thickness where the vessel can operate. Therefore previous studies on the ice resistance of a ship have focused on speeds below 10 knots. On the other hand, icebreakers operating at the Baltic Sea seldom navigate in ice conditions which correspond to the maximum thickness. In addition, maritime administrations have started to emphasize the need for higher escort speeds, typically recent requirement definitions have been 12 to 13 knots. This would provide more fluent traffic. The effect of speed on the ice resistance is poorly known and one of the main reasons for this is that the combined effect of the open water resistance and the ice sheet is unknown. The ice resistance is often divided into different components and speed dependencies of these components are unclear. Especially the speed dependency of the breaking component is debated. Also the knowledge of doing model tests at higher speeds is limited. The purpose of this work was to experimentally study the speed dependency of the breaking component and the restraining effect of the ice sheet on the wave making of the ship, and also gather information about the ice breaking process at high speeds for future research.