Abstract: The invention relates to a catamaran-type sail boat comprising several inclined mast-like elements rotatively mounted at their lower ends and upper ends respectively by appropriate lower connecting mechanism and upper connecting mechanism, the masts being provided over at least a portion of their length with a fin rigidly connected to the masts, the fin working as a sail. Angular rotation positioning mechanism is provided to rotate the rotatable masts provided with the fin so that the boat can be driven at will.