The yield of wind turbines depends primarily on the area covered by the rotor blade. For the materials currently used for rotor blades, the physical load limits have been reached for today's turbine sizes.
Load-reducing measures such as the use of back-flow-flaps could make it possible in future, to realise larger rotor blade diameters with state-of-the-art materials.
Even with smaller rotor blade diameters, e.g. in existing plants, load-reducing measures can make it possible to optimise running times.
In particular also for the reduction of load peaks and vibration induction on larger wind turbines, e.g. with cross-flow (YAW-effect), back-flow-flaps can be useful in the future in order to make offshore wind turbines even larger and to enable a long service life.