Extract from the ZDF Länderspiegel issue of Dec. 6, 2014:
The new wind turbines planned for Bavaria are 200 metres high.
To better protect residents, they will be now located at least 10 × 200 m = 2 km from dwellings.
This will inevitably result in limiting the number of wind turbines, but the Minister-President Horst Seehofer said:
I won’t let giant asparagus ruin Bavaria’s nature and its wonderful landscapes.”
The 10H rule
It has the merit of taking into account the technological evolution of industrial wind turbines, which reach ever higher in the sky and emit ever more infrasound. Although residents will not be sufficiently protected against infrasound, which travels further than 2 km, we can only welcome such a move!
Enhanced security in case of accident
The 10H rule enhances public safety in case of accident. Indeed, the basic laws of ballistics tell us that in the worst-case scenario, blade debris can be projected to a distance of 10H.
“The projection from the tip of a blade is comparable to the ballistics of a stone or a projectile launched by a catapult whose center would be the axis of the rotor, and the radius the length of the blade of the wind turbine.”*
For example, in the case of a wind turbine 125 m high:
The range is 1000 m and the rebound about 300 m, i.e. a total distance of about 10H.
* Source: Annex II of the study La sécurité publique des centrales éoliennes industrielles by engineers Jean-Pierre Abalain, Jean-Yves Chazal and Bernard Schumpp.