INTRODUCTION: Optimization of technique to improve performance in ski jumping is a complex process to which a wind tunnel can contribute data and understanding. In ski jumping, take-off action is one of the most important factor. Coaches and athletes are confronted with the problem of assessing the efficiency of different motion strategies. Mathematical models may provide an adequate solution to confronte objective data and athletes perception in condition of wind. The purpose of this work is conducted to develop a simplified mathematical model of in-run, take off and early flight phase performance in ski jumping as a support for training sessions of athletes in a wind tunnel, METHOD: The model is based on computing each of the forces involved in the motion equation. The model integrates the influence of the lift force onto the friction force and the inertia of the jumper for each part of hill's curve (figure 1). Wind tunnel equipment allows to measure the external forces exerced on the ski-skier System, the motion equation can be solved and simulations can be performed (figure 2). This method can be used to estimate variations in performance induced by different postural strategies. RESULTS: Such simulations find an application in the field of training as they permit to assess the impact on performance of a given strategy compared with another.
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