A small scale energy efficient vertical axis wind turbine (VAWT) (Fig. 1) was developed and tested. Details of the wind
turbine development were presented elsewhere [13]. The top and bottom of each blade was a 1066.8 mm x 139.7 mm x 50.8
mm deep rectangular section to allow for easier connections to the radial arms and passive pitching system. The shaft was
connected to the main parts and to the alternator during the full assembly of this vertical axis wind turbine. The belt drive
system was consisted of several parts of the belt drive calculation and the V–Type belt was considered. The corner sharp had been used as aerofoil for the wind turbine blade by producing a controllable aerodynamic force with its motion through
the wind flow. The components of the small scaled vertical axis wind turbine are designed by using the CATIA software
installed in the Structural Laboratory. VAWT generated the power via a combination of turbine blade-air flow interaction
and electric generators. In general, as the rotor rotates it converts the wind energy into mechanical energy. Several
experiments were carried out in an open area of the laboratory. Before starting the operation, the battery terminal and
alternator terminal were checked and connected to the light bulbs via connecting switch. Due to the rotation of the wind
turbine blade, current was produced and the bulbs were turned on. The ambient pressure and temperature were recorded
using the manometer and thermometer, respectively for the evaluation of air density in the laboratory environment. The
power produced by the wind speed was also calculated by using equations (1-6). The wind speeds at the time of testing was
measured between 5.89 and 7.02 m/s by using a digital manometer. For the different measured velocities, corresponding
Reynolds numbers and wind power were calculated. The simulations had been carried ou