Where is Nashtifan? and what is the story of its name? Nashtifan is a small city in north-east of Iran, near the Afghanistan border. Initially named Nish Toofan, or “storm’s sting,” the windmills have withstood winds of up to 74 miles an hour.
What should be seen? As I revealed the secret before (lol), the Nashtifan windmills should be seen. These wind mills are unique and wonderful.
People for centuries used these windmills to make wheat flour for bread. You cannot find these kinds of windmills nowhere in the world, because they are vertical.
Why ancient make windmills in Nashtifan? This is a simple question, because in this area strong winds are blown about 120 days per year. So it is a grate opportunity to make wheat flour for bread.
Also amazing part of the story is that, an old man live there and keeps one of windmills alive for travelers to see how it works.
Local people called them Asbad (windmill). Asbads of Iran are among the oldest in the world. With the design thought to have been created in eastern Persia between 500-900 A.D., they have been in use for several centuries.
Why Persian windmills are made vertical? I found some reasons from Wikipedia:
Advantages of vertical axis wind turbine (VAWT)
VAWTs offer a number of advantages over traditional horizontal-axis wind turbines (HAWTs):
- Being omni-directional, some forms do not need to track the wind. This means they don’t require a complex mechanism and motors to yaw the rotor and pitch the blades.
- VAWTs generally function better than HAWTs in turbulent and gusty winds. HAWTs cannot efficiently harvest such winds, which also cause accelerated fatigue.
- The gearbox of a VAWT takes much less fatigue than that of a HAWT.
- In VAWTs, gearbox replacement and maintenance are simpler and more efficient, as the gearbox is accessible at ground level, so that that no cranes or other large equipment are needed on-site. This reduces costs and impact on the environment. Motor and gearbox failures generally are significant considerations in the operation and maintenance of HAWTs both on and offshore.