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:

Type Efficiency Noise Birds Starting speed
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”