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In this paper we present the results obtained by numerical simulation regarding the propulsion device for boats equipped with the system of counter rotating masses discussed in Part I of the work. The equations of motion of the systems illustrated in Part I are integrated and the performances are evaluated by considering two pairs of counter rotating masses, properly phased and driven by unilobe elliptical gears. In order to evaluate the propulsive efficiency of the device, applying the formulas previously outlined and based on the direct use of the energy equation, the powers provided and consumed by the system for obtaining a rectilinear motion are computed. The simulations have been performed with reference to a vessel model whose length is equal to 14 m (the previous studies, as discussed by Muscia and Sciuto 2009, 2010, Muscia 2014, considered a vessel model long about 1.7 m). The stern of this vessel has a particular shape. The propulsive efficiency has been calculated with reference to a situation of steady motion.R. Muscia, G. Sciuto (2009) "Analisi dinamica di fattibilità concettuale di un dispositivo per la propulsione navale senza uso di eliche", Proceedings of the Mathematica Italia User Group Meeting 2009, Università di Padova. 24-25 Settembre 2009, AREZZO, ADALTA, pp.1-12.R.Muscia, G. Sciuto (2010) "Analytic study of a new conceptual propulsion device for ships", International Journal of Naval Architecture and Ocean Engineering, volume 2, number 2, June 2010. pp.75-86. 2092-6782.R. Muscia (2014) "Improving performances of a vibration propulsion system for marine vessels", Paper submitted to Multibody System Dynamics (review phase: revisions requested).