Load carrying Spar

The central part of a rotor blade is the main spar. As opposed to one of the more conventional ways of making spars where material is winded around a mandrel from the root to the tip of the blade, the best outcome is when the spar carries all loads and the aerodynamic profile is laminated as a shell and glued around the spar.

The critical surface between spar and shell has to be as precise as possible in order to be glued and assembled in a proper way and SSP’s load carrying spar makes this possible.

The main SSP spar is produced in a two pieces female mould. One advantage of this is that the surface of the spar is well defined and very precise at any point. Another competitive advantage of the spar produced in a female mould is the fact, that any desired strength of a blade can be constructed without changing moulds. This means that customers can upgrade their class II blade in a certain size into a class I blade without changing production tools.

Due to the fact that producing a spar on a mandrel becomes an unsolved problem when blades get longer, SSP sees a huge market potential for their load carrying spar.   
  
Advantages:

• Full glue line control on the outside of the spar, because of our innovative production processes.
• The spar can be customised to any wind class without changing the mould.
• The laminate can be controlled visually at both sides.
• High repeatability and minimal weight differences.
• Use of pre-impregnated materials (prepreg) as a value added material.

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