Computational Fluids Dynamics was performed to simulate the performance of torque and output power of wind turbine. Propeller of wind turbine is made by sandwich composite. The composite is combination of ramie fiber with Albizia wood as a core. FLUENT is used to perform simulation of propeller at different wind speeds. The wind speeds ranges from 3 to 5 m/s at coastal area of Kwaru, Bantul, Yogyakarta. Spallart-Almaras method uses to simulate the torque and power output at different Reynold Number. The simulation result shows that the torque of rotor ranges from 25 to 75 Nm, power outputs range from 50 to 240 W and power output coefficients are lay between 0.35 to 0.40 for wind speed from 3 to 5 m/s which is typical in coastal area of Indonesia.