This type of turbines are much less popular than their horizontal counterparts due
to their inherent less capacity to extract power from the wind and because usually
requires strings to hold the pole, this increases the real estate requirements in
farms or nearby buildings.
Some of Their Advantages:
1-The generator, power control and gears box can be al the lowest height.
2- No need for a positioning mechanism to turn the rotor before the wind.
3- Simpler construction
1- Wind speed is low at low levels, missing much of the potential wind energy
2- Most machines need a push to start their movement
3- May requires strings to hold the pole in place
4- Are less efficient as compared with the vertical types