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The Fok system, invented by engineer P.L. Fauël, was inspired by the jib on a sailing boat ('fok' is the Dutch word for jib). In this design the leading boards are replaced by a rounded profile of wooden slats in the form of a foresail leaving a small slot between this profile and the stock. Its working principle can be compared to a leading edge slot on an aircraft wing. It enables the mill to work in a lower windspeed but in variable

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