The purpose of this thesis is the development of a system of compressible, flap-like variable Wave Energy Converters (WECs) aimed at maximizing energy capture. Traditional WECs have fixed geometries and, consequently, limited efficiency. An alternative approach is to adapt the geometry of the converters to the incoming wave conditions, based on the acting wave forces, thereby improving power production without the need for costly reactive power systems. Numerous studies have demonstrated that variable-geometry devices can significantly enhance energy absorption. This thesis project, carried out in collaboration with Mondragon Unibertsitatea (Spain) under the supervision of Dr. Markel Peñalba Retes, explores theconcept of shape-changing, multibody flap-type WECs coupled with a Power Take-Off (PTO) system, in order to transform the mechanical energy of ocean waves into electrical power.