Alpine Ski Variable Sidecut for Turn Initiation and Grip Control
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Solution Overview
Problem
Existing alpine skis with symmetrical sidecuts and constant curvature radius fail to optimize performance, especially in racing, due to inadequate force distribution and steering characteristics.
Innovation Solution
The alpine ski features a variable sidecut with a greater width at the rear contact line than the front, a minimum width forward of the mid-boot line, and a maximum radius of curvature at the narrowest point, combined with a positive second derivative of curvature variation, enhancing ease of turning and terrain adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant radius of curvature is used in the sidecut, then the ski provides stable curved paths, but it fails to optimize force distribution and steering characteristics for racing performance
Solution Approach 1:
The patent applies local quality by varying the radius of curvature at different longitudinal positions along the ski waist. The sidecut radius transitions from a first value at the front contact line to a second value at the rear contact line, with at least one intermediate value between them. This creates non-uniform local characteristics that optimize force distribution and steering for racing, while maintaining overall structural stability.
2Ease of manufacture
If the ski width is uniform or symmetric, then manufacturing is simplified, but racing performance and terrain adaptability are compromised
Solution Approach 1:
The patent implements asymmetry by defining the sidecut such that the radius of curvature varies asymmetrically along the longitudinal axis. The front contact line has a different radius characteristic than the rear contact line, with intermediate variations that create an asymmetric force distribution pattern optimized for racing performance and terrain adaptability.
3Ease of operation
If the sidecut radius varies significantly, then steering responsiveness improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by systematically varying the radius of curvature parameter along the longitudinal axis of the ski. The sidecut is defined with a progression of radius values from the front contact line through intermediate positions to the rear contact line. This controlled parameter variation optimizes steering responsiveness while providing clear manufacturing specifications for achieving the desired geometry.
Data Source
AI summary
The present invention relates to an alpine ski including a tip zone located at the front of the ski, a waist zone, and a tail zone located at the rear of the ski, a median longitudinal plane extending from the front end to the rear end of the ski, an underside formed by a gliding sole bordered by edges, a zone for mounting a boot. The alpine ski further defined by a radius of curvature measured along the sidecut of the alpine ski.