Why are Horizontal Axis Wind Turbines used other than Vertical Axis?

T.O.E Dream

Why are Horizontal Axis Wind Turbines used more often than vertical axis when it looks like a vertical axis has more of an advantage? Please can you explain it simply?

Bob S

What is the advantage of vertical axis machines over HAWT's (horizontal axis wind turbines)? VAWTs are omnidirectional. But the HAWTs are theoretically about 25% more efficient than a Darrieus rotor and about 3 times more efficient than a Savonius rotor (VAWTs), measured on a frontal area basis..
Another advantage of VAWTs is being able to put all the electrical equipment at the base of the tower, for easy access at ground level.
Bob S

schangtze

I do not think that there is any advantage of using vertical axis Wind Turbines.By the way, as far as I know, we live in troposphere ,where the wind is of Horizontal ,and it is in stratosphere that wind blows from bottom to top.

Bob S

Both horizontal axis and vertical axis wind turbines are designed for horizontal wind direction. The horizontal axis turbines are the most efficient for specific wind velocities, and because the pitch of their blades is adjustable, are relatively effficient for a large range of wind velocities. Neither vertical axis turbine designs have adjustable pitch blades.
Bob S