Experimental assessment of interference resistance for a Series 60 catamaran in free and fixed trim-sinkage conditions

► Multihulls interference resistance experimentally studied. ► Test condition (fixed or free model) is analysed. ► Experiments carried out with Series 60 catamaran (novelty). ► Favourable interference regions are affected by the condition (novelty). ► Significant difference with respect to the theoretical model (novelty).