windmills are used for air turbine in indiana.
windmills are used for air turbine in indiana.
what are the windmills used for in indiana?
air turbine
the first practical windmills were in use in sistan, a region in iran and bordering afghanistan, at least by the 9th century and possibly as early as the 7th century. these "panemone windmills" were horizontal windmills, which had long vertical driveshafts with six to twelve rectangular sails covered in reed matting or cloth. these windmills were used to pump water, and in the gristmilling and sugarcane industries. the use of windmills became widespread across the middle east and central asia, and later spread to china and india. vertical windmills were later used extensively in northwestern europe to grind flour beginning in the 1180s, and many examples still exist. by 1000 ad, windmills were used to pump seawater for salt-making in china and sicily.
history of wind power
section::::history.









































when the windmills of the 18th century included the feature of rotor orientation via the rotation of the nacelle, an actuation mechanism able to provide that turning moment was necessary. initially the windmills used ropes or chains extending from the nacelle to the ground in order to allow the rotation of the nacelle by means of human or animal power.
yaw drive