Aerodynamic efficiency of recently suggested design of wind power plant called Wind Energy Marine Unit (WEMU) with large cross-flow water-supported rotor having rotary blades is found out. Aerodynamic coefficients of chosen airfoil of WEMU blades are derived by 3-D Navier-Stokes numerical simulation. Preliminarily calculated angles of blades' rotation are corrected after simulation of flow through the turbine. Power coefficient is investigated as a function of the turbine's solidity and the ratio of velocities. It is shown that power coefficient comes close to Betz limit. WEMU's rated power capacity can be more than 10 MW. Power loss due to blades' rotation is evaluated.
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