INTRODUCTION: The deflection of the ski is crucial in alpine skiing, at least to achieve carved turns. In theory, due to the geometric shape of the ski, the ski deflects dependent on the achieved edge angle, supported by additional movements (Lieu et al. 1985). However, up to now, the proof of this (simplified) theory and the scientific validation in field measurements is missing (Thorwartl et al. 2022). In this study, a new measurement system is used to measure deflection of the ski in combination with torsion and edging. METHODS: Special purpose strain sensors were applied to measure the high deformation of the ski composite material. The deflection and torsion deformation of the ski was recorded at six positions with a maximum sample rate of 490 Hz. To validate the system, a new device (SkiTOBI - ski torsion and bending instrument) was used, which was constructed to classify the bending and torsion stiffness of the race skis of the German Ski Team. A 3-D IMU sensor (400 Hz), mounted on the ski boot, was used to measure the edge angle during skiing. RESULTS: The validation measurements of the applied strain sensors on the device SkiTOBI in the lab showed, that the different initiated deflection and torsion of the ski by the SkiTOBI-device is comprehensible represented by the results of the applied sensors. Furthermore, a very good repeatability was detected. DISCUSSION/CONCLUSION: The results from the lab showed a good reliability of the measurements of deflection and torsion behavior of the ski. In combination with the recording of the edge angle, the measurements on the slope will show the correlation of edging and deflection during skiing. Results will be presented at the congress. REFERENCES: Lieu, D. et al, 1985. Ski Trauma Saf Thorwartl, C. et al., 2022. Sensors
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