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didnt really do my research before writing
Because they're designed to do that, so that the machinery and process doesn't break.
it's always your left hand
like... that's how the gearing and rotor have been engineered.
that's so isn't it
I *ALWAYS* perform the indie windmill with my arms going forward from their highest point
each individual windmill WILL always turn in the same direction because of the way that its blades or sails are built, they are angled, so that when the axle is turned to face the oncoming prevailing winds they will always have the same angle vector the general wind direction.
One COULD manufature a windmill setup that could have blades that could have variable blade pitch, (like helicoptors) because they could then be altered to maximise efficiency according to wind speed or consistancy of wind speed....although the increase in cost of manufacturing and maintainance would need to be weighed against gains in efficiency....HOWEVER there is NO benefit to altering the pitch of these blades to the extent that they would be variable beyond 90 degrees and thus make the blades turn the wheel round the other way.
You will find that windmills of a type will all rotate the same way, because of ease of manufacture, and that an industry convention has probably grown up (if for no other reason than health and safety - wind farm operatives would probably be happier if they always knew which way windmills turned.)
In the past when things were not uniformly regulated then there would be more variation in which way they would turn.
Build some yourself, you can get them to turn both ways, its just down to the shape of the blades/sails
so either the OP was asking;
- Why does a singular wind turbine always go in the same direction
- Why do ALL wind turbines go in the same direction.
The first one is that it's too difficult to engineer and pointless when you can have it turn on it's Y axis.
The second one is not true as a convention, I don't think, but might be true. When the turbine is yawing it loses a bit of power, and I think the worst case when it's +/-30° or something (checked Wiki, it mentions this in some fashion).
Also, some turbines do have variable pitches on the blades.
do you think the op might have been why do all wingmills turn (on a vertical axis) to face the same way (i.e. towards the wind) (also a subtext to this, do you think that he meant facing the wind as opposed to facing away from the wind? there is an answer to this too, which I could give, but its a bit involved and not of that great interest to people probably....especially with my verbal technique)
than the other way around, due to the presence of the turbine mechanism and the pole supporting the windmill blocking the wind.
Even if these were made to be aerodynamic, there would still be a loss of wind to blades, in addition to this there would be buffeting and an uneven force applied to the blades due to these obstacles, this would increase wear and tear significantly.
it's cool you know a lot about them. :D
one question i have, is, do they change hich way they are facing simply by being blown into possition by the wind, or is it calculated based on average windflows?
(in parallell to the axis of the propellor) that could have like a verticle plane at the end (like an aeroplane) this would cause the mechanism to swing around to face the wind (you can sometimes see small versions of these by the sides of motorways) (like a weathervane)
I imagine with the big ones there is some sort of electronic system that controls the direction that they face, I imagine these can be switched from being automatically driven acording to sensors measuring the current wind to being overidden to respond to other feeds.
i'd imagine it would be quite dangerous in gusty wweather otherwise.
from the other side the clock's clockwise is backwards. try it with a plate. get a plate and watch it clockwise then leave the plate in the same place but put your head underneath it and keep looking at it the same way, it will be anticlockwise
As to what contour the blades are given, thus making them turn in the right direction.
A bit like clockwise to tighten a nut, anti-clockwise to loosen it.
Just a guess.
and they turn the entire top part around to face the wind, whichever way it's coming.