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study aims to analyse the effect of blade length on the shaft rotation of a small-scale HAWT (horizontal axis wind turbine). A small-scale HAWT with the NACA4418 blade length of 1.25, 1.50, and 1.75 m was tested using three different blades (3, 4, and 5 blades) at speeds between 3 and 8 m/s without generating load. The lengths affected the tip speed ratio in this condition, considering various counts. The results showed that the rotor stability of a 1.25 m blade length was better than others at 4–6 m/s, based on the produced TSR value. The CP of the wind turbine also began to change significantly at 5 m/s, with the five-blade system of 1.25 m having the best rotation at medium speeds compared to others at 1.50 and 1.75 m. The correct number of blade lengths is essential for optimal and efficient overall turbine performance.
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