
The sidecut is a general term for the curvature of a ski, snowboard, or skiboard that is seen when looking down from the top. The sidecut depth is measured as the distance between the waist of the board and an imaginary straight line that strikes both of the contact points at the tip and tail. The sidecut radius is the radial measurement of the cu...
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http://en.wikipedia.org/wiki/Sidecut

The arcs formed on each side of the ski (when looked at from above) to allow the potential for reverse camber.
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http://www.encyclo.co.uk/local/21283

The shape the edges of the board form dictates its feel on the edge. Progressive sidecut gives a consistent feel throughout the turn. Complex geometries allow designers to totally customise the sidecut for differing levels of performance and feel.
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http://www.encyclo.co.uk/visitor-contributions.php

The difference in millimeters between the ski's waist (or narrowest part) and the tip and tail. A large sidecut allows skis to carve turns more readily.
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http://www.rei.com/learn/expert-advice/skiing-glossary.html

The inner curvature of a ski or snowboard, measured by the difference between the narrowest point in waist of a ski or snowboard to the widest points at the tip and tail. The curvature of a sidecut is the key component in creating a turning radius; the more drastic the sidecut, the sharper the turn.
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http://www.skis.com/Glossary-of-Ski-Terms/article-12-18-2012,default,pg.htm

A measure of the gradual hourglass shape of parabolic skis and shaped skis.
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https://snowslang.com/glossary/

This is where the revolution began! The sidecut is defined by the width of the ski at the three main points: tip, waist and tail. In short, the deeper the sidecut, the greater the difference between the width of the tip-tail, compared to the waist, making the ski more parabolic.
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https://www.encyclo.co.uk/local/21308

The inward arc or curve created by the edges of a board.
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https://www.rei.com/learn/expert-advice/snowboarding-glossary.html
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