In this paper, progress on the development of a coupled model of dynamics for VAWTs will be presented, called FloVAWT. There has been a resurgence of interest in the development of vertical Aerodynamic load modeling is based on Paraschivoiu's Double-axis wind turbines which have several inherent attributes that offer Multiple Streamtube (DMST) approach (1988), relying on blade some advantages for offshore operations, particularly their scalability element momentum (BEM) theory with corrections for dynamic flow and low over-turning moments with better accessibility to drivetrain and three-dimensional effects. This model also incorporates a stochastic components. This paper describes the current status of a'semi-coupled' wind model and unsteady platform motions. Hydrodynamic loads are model of dynamics, and a first investigation of the relative order of modeled with a time domain seakeeping model (Fossen and Thor), magnitude of aerodynamic loads on the system and how they influence based on hydrodynamic coefficients estimated with a frequency the system's motion.