Woudse polder Bosman - Windmills on Waymarking.com

The Bosman mill at this point is part of the drainage system of the Woudse Polder near the little village of 't Woud. I only can be visited by walking or by bike.

The Bosman mill is a small polder mill designed and constructed in 1929 by Bas Bosman in the Dutch town Piershil. It is applied anywhere in the world.
In early models of this windmills, the bevel gear was made from the differential of a T-Ford. The mill worked semi-automatic. It turned automatically on the wind through the tail blade and vane, but had to be turned from the wind by turning the vane by hand a quarter, until it laid flat and caught no wind any more.
Later the operation was controlled by the water level in the ditch (by a floater) and a support vane, at right angles to the main vane. Later models worked with a differential from the A-Ford (until 1960) and the Ford V8 (until 1977). From 1977 Bosman makes the drives by themselves.
In 2006, the latest model came in the market. This includes many improvements. This mill is fully automatic. There’s a floater on the water to set, connected by a rod, the position of both vanes. If the water level in the ditch is high, the main vane is vertical and the auxiliary vane lies flat. This turns the mill by itself in the wind. When the water level drops, the floater adjusts the vanes until the lowest position of the main vane is flat and the auxiliary vane is vertical. This turns the mill from the wind.
The spinning wings drive a centrifugal pump, the water will be pumped from the ditch. If the water is sufficiently lowered, the floater turnes the vanes in such a way that the blades rotate out of the wind and the drainage stops. The pump provides enough resistance to storm to avoid overrunning of the mill. The greatest danger is dirt that is sucked into the pump or blockage of the floater movement. Therefore there are always dirt grills in the ditch, just before the mill.
The mill is mainly used for the pumping of large amounts of water with only a small discharge head. The starting wind speed is about 3 m/s at a discharge head of about 0.3 meters. The mill is suitable for drainage of an area of 20-25 ha in flat, open polders.

Head - Wind - Capacity
0.5 m - 4 m/s - 0.7 m³/min
0.5 m - 7 m/s - 1.8 m³/min

The Bosman mill at this point is also used for some direction arrows to some sites of interest in the neighborhood.

Purpose: Water Pumping Open to the public: yes Is This Windmill Functional?: Yes! Windmill Farm: no Museum on Site: no Date of Manufacture: Not listed Cost: Not Listed

Visit Instructions:
When logging a VISIT to a windmill that has been Waymarked, please take a a photograph of the Windmill and provide a summary of your visit. In this way we can track changes to the mills over the years

Recent Visits/Logs:

There are no logs for this waymark yet.