The VIRYA-2.8B4 windmill is designed to drive a rope pump using an accelerating gearing with a gear ratio of 2.5 in the windmill head and a vertical shaft in the tower. For very low heads it might also be possible to couple the VIRYA-2.8B4 to an Archimedian screw pump. The gearing can be realised with a 12 mm string and one auxiliary wheel. The transmission is described in report KD 320 (ref. 1). The rope pump and the starting behaviour are described in report KD 321 (ref. 2). The VIRYA-2.8B4 is meant for use in developing countries. The use of stainless steel is therefore limited as much as possible. The VIRYA-2.8B4 windmill has a 4-bladed rotor with galvanised steel blades.
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