This paper presents both numerical and experimental results of a novel CMMCT (Composite Material Marine Current Turbine). The numerical simulations were carried using FLUENT CFD (Computational Fluid Dynamics) in a free stream of water with imposed boundary conditions that simulated the real environmental conditions. The experimental testing was conducted in a water tow tank by attaching the CMMCT to a moving carriage. The extracted torque and power were measured under the same conditions as the CFD simulations. A comparison between CFD and experimental results shows an excellent agreement, which supports the efficient prediction by CFD, and the applicability of using a water tow tank with appropriate corrections in simulating the ocean marine current. The results of the study offer a greater understanding of the hydrodynamic design and working performance of the CMMCT.