Windmill Ruprechtov, Technical monument in Ruprechtov, Czech Republic

Windmill Ruprechtov is a Dutch-type windmill built in 1873 in the village of Ruprechtov. Its rotating roof carries a Halladay turbine with a ring of adjustable vanes, 10 m in diameter and weighing about 2 tons, turning 16 m above the ground. The original milling machinery remains inside.

The windmill was constructed in 1873 and originally featured a traditional wind wheel that was damaged during a storm. Owner Cyril Wagner later replaced the damaged wheel with an American Halladay turbine to continue operations.

The mill was declared a Czech cultural monument in 1958. In autumn 2009 a CZK 10 postage stamp showing the mill was issued, designed by Petr Melan and engraved by Václav Fajt, and the Czech National Bank released a 2,500 CZK gold coin designed by Jiří Harcuba.

The mill stands at the edge of Ruprechtov in the Vyškov district, near Brno in the South Moravian region. It was fully restored in 1998 and is open to the public, with guided tours that go inside to the original milling machinery and the turbine. The roof turbine still turns, though grinding stopped in the 1960s.

The windmill houses the only Halladay turbine in Europe, a device created by American inventor Daniel Halladay with automatically adjusting blades. This turbine is designed to position itself optimally to the wind without requiring constant manual adjustment.