A vertical-axis ‘sailwing’ windmill is developed for autonomous wind-powered water-pumping. To determine the optimum design configuration of the rotor, various model test were carried out in a wind tunnel. The variable parameters were the shape and number of sails. The results favoured a rectangular shape with four sails, as fabricated for tests. Experimental studies determined the starting characteristics and water discharge capability of the integrated V-axis sailwing water-pumping system. The result shows that the system has self-starting characteristics and could pump 25 l/min. of water at 6 m/s wind speed.
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