Flapping foils show great promise in augmenting the ship’s propulsion in head waves, as they can harness the energy from the waves to create thrust. Along with their propulsive capabilities, they provide stabilization in the ship’s pitch and heave movement by reducing the ship’s response, and a consequent reduction in the ship’s resistance. It is already shown, both by experimental and numerical data, that the symbiotic relationship of a ship and a flapping foil provides the above-mentioned benefits for a foil that is mounted rigidly slightly ahead of the vessel’s bow [13]. In the present study, a flapping foil in the same configuration, but mounted on a torsional spring, is introduced to investigate propulsion and stabilization enhancements when allowed to move passively. Based on experimental data taken from the towing tank of the Laboratory of Marine and Ship Hydrodynamics of the National Technical University of Athens (LMSH NTUA) and numerical data from the in-house CFD solver [9] , we propose the study of several dynamic flapping foil configurations. These configurations were simulated and the results suggest that marginal improvements can be achieved at certain configurations, prompting, however, that further parametric studies must be conducted.