Wednesday, March 21, 2012

Materials and more Materials.

The second ski class was based around materials and what goes into a ski. They asked us to watch videos of skis being made before class to get a idea of how the process works.  The style of construction used is called sandwich construction. You literally build the ski layer by layer. You start with the base and edges then run rubber strips along the edges and add fiber glass. Then you follow that by adding the core and more fiber glass and carbon fibers if that is what you choose.  You then add side walls, tip and tail spacers and more fiber glass over the mounting area and then the top sheet.  I am not sure this is the exact order but its close.  We also discussed the weight of skis and how each material affects the weight of the skis. The types of materials we will be using are Poplar core,  2.0 mm edges durasurf bases, UHMW top sheets and sidewalls, Carbon fiber and Fiber glass.
The most interesting part of class to me was talking about core profiles. I just figured the flex of the ski was determined by how much fiber glass you used rather than the core profile. We were shown on a graph 2 core profiles.  One was a symmetrical core that had a buildup in the middle of the ski, giving it more of an equal tip and tail flex. The second was a traditional core where the buildup was moved back from the center of the core giving the ski a more traditional feel.  We also talked about how milling just a fraction of the tip or tail or waist will change the flex.  The flex can also be altered by the weight of the fiber glass, carbon and how much of each you use in building the ski.
Overall, it was a great class and I’m looking forward to getting started.  I have been trying to decide which type of ski to build. As of now, I think I’m going to build something around 188 cm in length and a 115 mm waist.  This is more of a charger directional ski that will compliment my current quiver of skis quite well.  I have an idea of my graphics, the rocker and camber profile and the flex I want out of this ski. Let’s get started!

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