CRAIN is an independent consultancy located in La Rochelle which has been focused since its foundation in 1984 on wind propulsion. CRAIN has a strong background in naval architecture, fluid mechanics and energy efficiency which have been aquired by being involved in a variety of projects. CRAIN has a specific approach, based on a step by step and multidisciplinary method. It masters a large set of tools, from the evaluation of order of magnitude up to experimental methods. CRAIN's services are ranging from the evaluation of the aerodynamic properties of an isolated wind propulsion device up to the savings of a set of interacting devices fitted on a ship along its operating routes.