Results 121 to 130 of about 1,127 (156)
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The Physics Teacher, 2013
Consider a skier who goes down a takeoff ramp, attains a speed V, and jumps, attempting to land as far as possible down the hill below (Fig. 1). At the moment of takeoff the angle between the skier's velocity and the horizontal is α. What is the optimal angle α that makes the jump the longest possible for the fixed magnitude of the velocity V?
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Consider a skier who goes down a takeoff ramp, attains a speed V, and jumps, attempting to land as far as possible down the hill below (Fig. 1). At the moment of takeoff the angle between the skier's velocity and the horizontal is α. What is the optimal angle α that makes the jump the longest possible for the fixed magnitude of the velocity V?
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Jumping for recognition: Women's ski jumping viewed as a struggle for rights
Scandinavian Journal of Medicine & Science in Sports, 2016With the campaign for women's participation in international and Olympic ski jumping as a practical case, sport's potential for recognition of individual rights is explored. In line with Honneth's influential ethical theory, recognition of rights refers to a mutual recognition between persons of each other as rational and responsible agents with an ...
W, Andersen, S, Loland
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Aerodynamics of ski jumping suits
Sports Technology, 2011The primary purpose of this study is to understand the aerodynamic behaviour of textile fabrics used in ski jumping suits. Macro-scale (cylinder) and full-scale aerodynamic investigations of ski jumping suits and fabrics were undertaken. The aerodynamic effects of surface morphology of ski jumping fabrics were measured.
Harun Chowdhury +3 more
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Biomechanics of optimal flight in ski-jumping
Journal of Biomechanics, 1984The flight in a vertical plane of a ski-jumper after take-off was studied with the purpose of maximising flight distance. To solve the problem of optimal flight (how a jumper must change his angle of attack to obtain the longest jump) the basic theorem of the optimal control theory--Pontriagin's maximum principle--was applied.
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Numerical Simulation of Ski-Jump Hydraulic Behavior
2020The hydraulic behavior of ski jumps is investigated numerically using the OpenFOAM digital library. A number of ski-jump cases has been simulated by following the RANS approach (Reynolds Averaged Navier-Stokes equations), using the k-ω SST closure model, and the VoF technique (Volume of Fluid) for the tracking of the free surface.
Agostino Lauria, Giancarlo Alfonsi
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Serious ski jumping injuries in Norway
The American Journal of Sports Medicine, 1985Injuries caused by ski jumping have been poorly inves tigated. Among approximately 2,200 licensed jumpers in Norway, there occurred at least 12 injuries with a permanent medical disability of ≧10%. The risk of being seriously injured is approximately 5%o in a 5 year period (1977 to 1981); it is higher in the age group 15 to 17 years.
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SIGGRAPH ASIA 2016 Posters, 2016
We introduce a virtual ski jump system as indoor, experience-based entertainment. The goal of this system is an exciting, enjoyable, safe experience for an inexperienced person. The key of the system is the physical stimuli from below for realistic experience compared to other conventional systems.
Naoto Yoshida +3 more
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We introduce a virtual ski jump system as indoor, experience-based entertainment. The goal of this system is an exciting, enjoyable, safe experience for an inexperienced person. The key of the system is the physical stimuli from below for realistic experience compared to other conventional systems.
Naoto Yoshida +3 more
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Journal of Hydraulic Engineering, 2008
Ski jumps are a standard element of dam spillways for an efficient energy dissipation if takeoff velocities are large, and stilling basins cannot be applied. This laboratory study investigates the hydraulic performance of a triangular-shaped, rather than the conventional circular-shaped, bucket placed at the takeoff of ski jumps.
Steiner, Remo +3 more
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Ski jumps are a standard element of dam spillways for an efficient energy dissipation if takeoff velocities are large, and stilling basins cannot be applied. This laboratory study investigates the hydraulic performance of a triangular-shaped, rather than the conventional circular-shaped, bucket placed at the takeoff of ski jumps.
Steiner, Remo +3 more
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The Takeoff Forces in Ski Jumping
International Journal of Sport Biomechanics, 1989This study measured the takeoff forces exerted by jumpers during the 70-m ski jumping competition of the 1988 Winter Olympics in Calgary. Instrumentation consisted of four force plates installed under the snow of the takeoff platform. The results indicated that the greatest force was already exerted 149±9 ms before the release.
Mikko Virmavirta, Paavo V. Komi
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Performance factors in ski jumping
Journal of Biomechanics, 2006Predominant performance factors in ski jumping are: High in-run velocity, high linear momentum perpendicular to the ramp at take-off due to the jumping movement and the utilisation of aerodynamic lift, accurate timing of the take-off jump with respect to the edge of the ramp, appropriate angular momentum at take-off in order to obtain an ...
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