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Wind is a renewable energy and has many benefit. This energy is used by the salt farmers in the north coast of Java. Windpump is used to convert the wind energy for pumping water from sea to the salt pond. The purpose of this study is to get the performance of salt farmer’s windpump from Demak Region, Central Java for water lifting with vertically reciprocating pump. Rotation of shaft is directly converted to linear translation by crankshaft and connected to the piston pump. This study uses three variations lenght of the crankshaft arm in a piston pump. In 2 up to 5 m/s of wind speed range, the windmills from Demak with arm length of 5.0 cm, 7.5 cm, and 10.0 cm has an average volume flow rate of 0.89 litre/s, 1.8 litre/s, and 1.3 litre/s, respectively. For a day, these variations has a daily average volume of 19,278 litre, 39,162 litre, dan 27,804 litre.

Indonesian traditional windmill of Demak, Central Java for water pumping in traditional salt production