The development of CSI DN spars has been ongoing for decades. We draw upon a database from many years and hundreds of spars containing flex rates in fore/aft and side/side axes to design each DN spar. 
All CSI spars are custom engineered to suit the individual sailor's weight and plank spring rate.
Mast weight and VCG are at or near minimum to class rules.

All masts are built of with a state-of-the-art process
that involved wrapping layers of s-glass and carbon fiber over a mandrel.  Curing is done in an autoclave under pressure to ensure a void-free (in other words, reliable) laminate.  Our laminate is the most reliable, durable, and lightest design on the ice.

Masts are available in one piece or unique two-piece
design (introduced during the '98 season) that allow
tip sections of varying stiffness to be removed from
the highly flexible lower tube. This allows for ease
of transport as well as fine tuning capability.  The precision slip fit connection requires no fasteners.

DN Spars/Deflection.pdf  

Our spars are fitted completely with custom hardware.

• The original "T fitting " hound attachment introduced to the class is aerodynamically clean, providing full articulation, easily connected to the spar without tools.         

• CSI masts use a custom CNC machined black anodized
  hardcoat mast step plug with a four position socket
  adjustment.  On the inside, the mastplug contains a
  square recess into which an optional internal
  stiffener tube may be rigidly fastened in the proper
  orientation as needed for varying flex properties.

• CSI makes its own custom thrust bearing mast socket fitting. 
  This fitting allows the mast to rotate freely, with almost no
   friction between the mast step ball and the rig.
   A must for racing.  It uses standard 5/8" thread, Black hardcoat anodized.

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