A fantail is a small windmill mounted at
right angle
In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or radians corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. Th ...
s to the sails, at the rear of the
windmill
A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, specifically to mill grain (gristmills), but the term is also extended to windpumps, wind turbines, and other applications, in some ...
, and which turns the cap automatically to bring it into the wind. The fantail was patented in 1745 by Edmund Lee, a blacksmith working at Brockmill Forge near
Wigan
Wigan ( ) is a large town in Greater Manchester, England, on the River Douglas. The town is midway between the two cities of Manchester, to the south-east, and Liverpool, to the south-west. Bolton lies to the north-east and Warrington ...
, England, and was perfected on mills around
Leeds
Leeds () is a city and the administrative centre of the City of Leeds district in West Yorkshire, England. It is built around the River Aire and is in the eastern foothills of the Pennines. It is also the third-largest settlement (by popul ...
and
Hull
Hull may refer to:
Structures
* Chassis, of an armored fighting vehicle
* Fuselage, of an aircraft
* Hull (botany), the outer covering of seeds
* Hull (watercraft), the body or frame of a ship
* Submarine hull
Mathematics
* Affine hull, in affi ...
towards the end of the 18th century. Fantails are found on all types of traditional windmills and are especially useful where changes in wind direction are frequent. They are more common in England, Denmark and Germany than in other parts of Europe, and are little-known on windmills elsewhere except where English millwrighting traditions were in evidence.
The rotating fantail turns the cap of the windmill via a system of
gear
A gear is a rotating circular machine part having cut teeth or, in the case of a cogwheel or gearwheel, inserted teeth (called ''cogs''), which mesh with another (compatible) toothed part to transmit (convert) torque and speed. The basic ...
ing to a toothed
rack
Rack or racks may refer to:
Storage and installation
* Amp rack, short for amplifier rack, a piece of furniture in which amplifiers are mounted
* Bicycle rack, a frame for storing bicycles when not in use
* Bustle rack, a type of storage bin ...
around the top of the mill tower, or to wheels running on the ground in the case of a
post mill
The post mill is the earliest type of European windmill. Its defining feature is that the whole body of the mill that houses the machinery is mounted on a single vertical post, around which it can be turned to bring the sails into the wind. All ...
. It does so until the fantail sails are oriented parallel to the wind, whereby the wind can no longer move them. When the fantail is oriented parallel to the wind, the main sails are in the optimal perpendicular orientation and produce maximum power.
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References
External links
Shipley Windmill West Sussex.
{{DEFAULTSORT:Windmill Fantail
Windmills