We try to solve all the issues of small wind turbines that could prevent them from being used in a tight environment, near people, and near and on buildings. As a starter, they must be quiet and pleasing to the eye.
This table shows some basic characteristics:
|Horizontal axis||30%+||High||Dangerous||3 meters per second|
|Vertical axis lift||15-25%||High||Dangerous||3 meters per second|
|Vertical axis helix||5-10%||Medium||Dangerous||5 meters per second|
|Vertical axis drag||7-10%||Low||Safe||2-3 meters per second|
|Flower Turbines||35% alone*||Low||Safe||1.2 meters per second|
*when including the cluster effect, the performance increases so that our turbines perform 20-50% better; technically, that is not “efficiency”