The paper (Bae and Kim 2011) presented the theory and methodology for the coupled dynamic analysis among wind turbine, tower, floater, and mooring lines including aerodynamics, active control of blades, tower-blade elasticity, and floater-mooring dynamics in winds, waves, and currents for a 1.5MW mono-column TLP FOWT. Authors coupled the aero-elastic-control program FAST developed by NREL (e.g., Jonkman 2009) with the floater-mooring program CHARM3D/ HARP developed by Professor Kim’s research group (e.g., Kim et al. 2001, 2005, 2009) during the past decade to analyze full dynamic coupling of multi-floaters and mooring-riser. This kind of full dynamic coupling including all the aspects of FOWT is still very rare in the open literature and under continuous development in many countries. The most important differences between the FOWT and conventional floating offshore oilproduction platform are tower flexibility, rotational-blade inertia, active blade control, and the corresponding aero-dynamic loading. They influence the floater motions and mooring dynamics and, in turn, the platform motions affect the control scheme and aerodynamic/elastic loading. The two parts can be interfaced at each time step, as detailed in the paper. One of the important design concerns is the maximum acceleration at the nacelle. The height and tip-mass of FOWTs are typically large, so high acceleration there may cause very large inertia loading on the tower and floater. It can also greatly reduce the system’s fatigue life. In this regard, the correct estimation of the maximum acceleration at the nacelle position is very critical in the design of FOWTs. In case of a rigid floating body, the horizontal acceleration at the top consists of two parts. The first one due to horizontal motions (surge-sway) and the second-one due to rotational motions (pitch-roll) through the moment arm l from the center of rotation. In case of a flexible tower, there is additional contribution from the additional flexible modes. If we introduce the additional elastic modes, then the original rigid-body pitch natural frequency is slightly shifted due to dynamic x·· lθ ··