Mechanics of flight in ski jumping: Aerodynamic stability in roll and yaw

Marques-Bruna, Pascual; Grimshaw, Paul

doi:10.1080/19346182.2009.9648508

Cited by 11 publications

(2 citation statements)

References 7 publications

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“…Despite the elite level of the athletes, each subject showed an individually unique ski movement pattern during the flight phase. The analysis of the ski position could permit improving the aerodynamics of the athlete during the flight, since previous publications gave suggestions on the best ski configuration to increase the performance [1,3,6,7,32,36,37]. However, a previous study performed in a wind tunnel showed how the aerodynamics of an isolated ski depend on the combination of the roll, pitch, and yaw angle [32].…”

Section: Discussionmentioning

confidence: 99%

Ski Position during the Flight and Landing Preparation Phases in Ski Jumping Detected with Inertial Sensors

Bessone

Petrat

Schwirtz

2019

Sensors

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Ski movement plays an important role during landing preparation, as well as in the whole ski jumping performance. Good landing preparation timing and correct ski position increase the jump length and reduce the impact forces. Inertial motion units (IMUs) placed on the skis could constitute a promising technology for analyzing the ski movements during training. During regular summer trainings, 10 elite athletes (17 ± 1 years) performed jumps while wearing IMUs and wireless force insoles. This set-up enabled the analysis of a possible correlation between ski movements and ground reaction force (GRF) during landing impact. The results showed that the pitch during the landing preparation is the most influential movement on the impact kinetic variables since it is related to the angle of attack, which affects the aerodynamics. The ski position at 0.16 s before landing did not influence the kinetics because the athlete was too close to the ground. During the impact, the roll angle did not correlate with GRF. Moreover, each athlete showed a different movement pattern during the flight phase. Concluding, the combination of IMUs and force insoles is a promising set-up to analyze ski jumping performance thanks to the fast placement, low weight, and high reliability.

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Section: Discussionmentioning

confidence: 99%

Ski Position during the Flight and Landing Preparation Phases in Ski Jumping Detected with Inertial Sensors

Bessone

Petrat

Schwirtz

2019

Sensors

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“…Mannion et al 22 analyzed the crosswind aerodynamics of competitive hand-cycling under crosswind conditions using wind tunnel experiments and CFD simulations. As for the ski jumping, the ambient wind is closely associated with the fairness of the competition and the safety and stability of a ski jumper 23 , 24 . Jung 25 investigated the influence of ambient wind on the jump length and flight technique optimization (including the angle of attack of the skis and the body-to-ski angle) of ski jumping during the flight phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of ambient wind on the performance of alpine downhill skier

Zhang

Jia

et al. 2023

Sci Rep

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Alpine skiing, especially alpine downhill, is one of the most extreme winter sports in terms of high-speed and narrow winning margin, and its tracks are always located in mountainous areas with high altitudes and complex ambient wind fields, resulting in a significant impact of ambient wind on the performance and the final ranking of alpine downhill skiers. In the present study, a method based upon the combination of field measurements, wind tunnel tests and kinematic simulations was used to evaluate the effect of ambient wind on the performance of an alpine downhill skier. Considering the effect of ambient wind, a kinematic model of the alpine skier-ski system was established, and the equations of motion for straight gliding and turning were deduced. Then, the Chinese National Alpine Ski Center (CNASC) downhill track was taken as a case study to investigate the effect of ambient wind on the gliding time using the proposed combined evaluation method. Field measurements and wind tunnel tests were performed to identify five critical ambient wind directions of 270°, 292.5°, 315°, 337.5° and 360°. Moreover, the wind speeds and the wind directions for 16 different measurement points of the downhill track were also obtained. The results of the modelling analysis showed that the finish time increased by 19.75% for the ambient wind direction of 270°, whereas the finish time decreased by 1.29% for the ambient wind direction of 360°.

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