Central ND | HuskerJ - 11/30/2025 08:32
Like everyone else said, the tailfin is offset from the center of the fan. When enough pressure is put on the fan by the wind, it will 'fold' at the hinge point of the tailfin. There is a spring and linkage setup that is used to adjust how strong of a wind causes it to start to fold.
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Pretty simple design that has been around in the steel windmills for as long as they were probably made. The windmill head sits on top of a turntable. The tail pivot is mounted off to the side to the centerline of the windmill fan blades rotating shaft.it is attached on a pivot pin independently offset to the side of the centerline on the rear of the head gearbox.. When the wind pushed toward the face of the wheel hard enough it pushes against the windmill head harder and folds the tail to head relationship back to the side due to the pivot pin offset to one side of the windmill head gearbox by design for regulating the speed. It uses spring pressure between the tail and the windmill gearbox to hold it in full open /or full on position but the harder the wind pushes the longer it stretches the spring that holds it in place due to the offset hinge point between the tail and the windmill head box. On the windmills I'm familiar with, the windmill is turned off and on from the ground and the speed can be controlled by how far that control wire going up to the top of the windmill is pulled. The harder its pulled the more tension is puts on the spring between the tail and the windmill head, therefore the stronger the wind can be before it turns the blades off to the side to govern the speed in strong winds.
Edited by School Of Hard Knock 11/30/2025 10:17
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