ABSTRACT : The Savonius Turbine is a Vertical Axis Wind Turbine which is cheap to build, but it harnesses only a small fraction of the wind energy incident upon it. A proposal for improving its effectiveness is to replace the curved parts of the turbine's blades with movable airfoils. The airfoils open automatically as a result of wind pressure when they advance into the wind (and hence experience less flow-resistance), but close (again automatically) when retreating from the wind, i.e., during the power-harnessing part of the cycle. The experiment has been performed to find the relative improvement between Conventional Savonius Turbine and Modified Turbine by measurement of output power and rpm using Arduino circuit and formulation of theory is attempted using MATLAB to correlate the experimental results with the theory. The modified turbine displayed 21.36% increase in average power in constant velocity (4.8 m/s) conditions and 55.23% increase in average power in fluctuating velocity (peak velocity 4.8 m/s) conditions