Each blade consists of a set of two smaller blades. The theory behind the concept is, that two smaller blades running parallel utilizes the power in the wind better. At the same time, the joint 2/3 out from root of the blade makes it more stable and in larger scale weight can be reduced.


The concept is theoretically defined and the performance is calculated based on aerodynamic models. Small blade models in wind tunnels have been tested and both the theoretical calculations and results from model tests show the improved performance.


The blade can be designed for stall- as well as pitch-regulated turbines. The first full size rotor set is produced for a pitch-regulated turbine and is produced in a length of 8 meter. A size which fits to a 60KW turbine.


The blade is produced in standard glass fiber, and as the sketch shows a root connector attaches the ends of the two blades to a standard root mounting. This way the blade can be mounted on any pitch regulated turbine and is not dependent upon a specific root connection.



The JBRx16


Sketch of JBRx16


Joint Blade Rotor

Improving power production