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We just timed the four turbines in Atlantic City, NJ. The tip of the blade will of course spin faster than the base since it has further to travel, so that is what we will calculate.
Guesstimating that the blade is 120 ft. in length, we need to find the circumference of the circle described by the spinning blade tip. The formula for the circumference is 2¶r or two times the radius of the circle (which is the diameter) * pi (about 3.1415). So 2*120ft.=240ft. for the diameter. 240*3.1415=753.96ft for the circumference.
Since the blade travels that distance in 4 seconds, the ft/sec traveled is (753.96/4=188.49ft/sec). To get that speed in miles/hour multiply (188.49 ft/s * 0.681818182).
So the blade tip is traveling at about 128.5 mph!
Which is a little bit slow... They typically (company statement) rotate between 15 and 20 rpm so: 60s/m / 15 rev/m = 4 s/rev and likewise 20 rpm corresponds to 3 s/rev.
Measuring the blades laying flat on the ground in a construction yard in Google Earth results in an approximate length of 126 ft to 128.6 ft. HOWEVER, you also have to account for the hub that these are attached to. Measuring this is a bit more difficult as I couldn't find one where the perspective was perfect so I got between 3 and 4 feet for the radius of the hub. This results in an overall radius of between 129 ft and 132.6 ft. c=2*pi*r gives 810.53 ft to 833.15 ft. Dividing by the time to travel this distance (3-4s) gives 202.63 ft/s to 277.72 ft/s. Multiply this answer by 3600s/hr / 5280 ft/mi. to get it into mph.
Which gives a range of 138.16 mph to 189.35 mphfor the blade tip. Which seems very, very fast when you stand directly under it with it swinging at your face!
Side note: Some people complain about noise from them. Honestly I couldn't here anything over the howling of the wind.
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How fast wind turbines spin?
It depends on how hard/fast the wind is blowing- the harder/faster the wind blows the faster the wind turbine spins
How does the wind cause a turbine to spin?
turbines spin when there is a cause of wind..!!
Do wind turbines spin faster than windmills in light wind?
it would spin slower
How fast do wind turbines spin on average per minute?
It all depends on a number of factors, such as one of the most important ones being number of blades. Common wind turbines have varying amounts, so when you ask how fast on average, the question must be specified.
Why do wind turbines spin?
Because the wind moves the blades witch causes the turban to go
How fast wind turbines spin?
It depends on how hard/fast the wind is blowing- the harder/faster the wind blows the faster the wind turbine spins
How does the wind cause a turbine to spin?
turbines spin when there is a cause of wind..!!
Do wind turbines spin faster than windmills in light wind?
it would spin slower
How fast do wind turbines spin on average per minute?
It all depends on a number of factors, such as one of the most important ones being number of blades. Common wind turbines have varying amounts, so when you ask how fast on average, the question must be specified.
Do wind turbines spin fast or slow in light winds than old windmills did?
yes or no you answer think about it losers ok now get the hell out of my life:)
Why do wind turbines spin?
Because the wind moves the blades witch causes the turban to go
How is electricity produced by wind energy?
The wind spins the blades which are connected to turbines which cause the turbines to spin and create electricity that is spread across a power grid.
Why are dams built near river?
it is bcoz in a hydroelectric power station, fast flowing water spins the turbines. On a wind farm, the wind turbines spin due to fast wind and in the sea, in the sea, waves and the tide can be used to make a turbine spin. Courtesy by: sex
How do wind turbines amke electricity?
they make electricity by wind blowng on the blades makeing the generator spin
What are those things that spin around called on the wind turbines?
Rotors or blades.
Should wind turbine blades be heavy or light?
Light. It needs to be able to spin fast. Suppose you had a heavy blade, it would never spin. You might think it needs the extra weight to give it speed, but the wind turbines do not work off momentum, the work off the wind.
Why are wind turbines not turning on some windy days?
Wind turbines are usually shut down on days that the winds exceed 40 mph. It can be dangerous for the turbines to turn to fast.
