Three models with different footing types were used to clarify the effect of heave plates on the hydrodynamic behavior of the elastic response of a flexible multicolumn floating offshore wind turbine (FOWT).The models were tested here under regular waves, whose added mass, damping, and motion response results were compared with numerical simulations by NK-UTWind and WAMIT codes.As a whole, the attachment of heave plates was responsible for increasing the added mass and damping levels, consequently modifying the RAO of the models.Regarding the response in a sea nightstick twm-850xl condition, a decrease of 33% and 66% of the significant motion height (heave and pitch) was observed.Thus, the heave plate can be a good feature for the future design of FOWT.