Incredible as it may sound, the blades of the modern wind turbines, because of their motion, are creating problems to radar systems. In fact, it looks like standard radars encounter some difficulty when it comes to telling the movement of a small general aviation aircraft flying at low altitude, from the spinning of the blades of a turbine in a wind farm.
All this is creating some understandable risks for air traffic, especially if the wind farms are located near a sensitive area, which might be the target of a terrorist attack. The UK Ministry of Defense, in cooperation with the turbine manufacturers Vestas, is working on the development of invisible turbines which cannot be detected by normal radars thanks to the material used, similar to the outer shell of a Stealth invisible aircraft.
The project, partly funded by the UK Government, works on the integration of stealth materials on the blades of an existing wind farm. This way, the radar presence is roughly cut by 50%. At this point radars will be able to filter out any track below a certain output level, identifying wind turbines as non relevant for air traffic.
Thanks to this system, it will for example be possible to optimize air traffic management, avoiding accidents and collisions between small planes, which have always been difficult to handle for air traffic controllers. From the point of view of energy production, it will be possible to boost wind farms, by introducing new generations of towers, which generate more power, and most of all, they can do it safely and without interfering with air traffic!