• Aerodynamic influence of an alpine skier’s arms 

      Giljarhus, Knut Erik Teigen; Reid, Robert Cortas; Liland, Fredrik Fang; Oggiano, Luca; Elfmark, Ola (Peer reviewed; Journal article, 2022)
      Understanding how postural changes in alpine skiing affect the overall aerodynamic drag is highly important for enhancing performance. Although the arm configuration of the athlete can have a significant impact on the ...
    • Aerodynamic Interaction between Two Speed Skaters Measured in a Closed Wind Tunnel 

      Elfmark, Ola; Bardal, Lars Morten; Oggiano, Luca; Myklebust, Håvard (Journal article, 2019)
      Team pursuit is a relatively new event in international long track speed skating. For a single speed skater the aerodynamic drag will account for up to 80% of the braking force, thus reducing the drag can greatly improve ...
    • Aerodynamic Investigation of Tucked Positions in Alpine Skiing 

      Elfmark, Ola; Giljarhus, Knut Erik Teigen; Liland, Fredrik Fang; Oggiano, Luca; Reid, Robert (Peer reviewed; Journal article, 2021)
      The purpose of this investigation was to examine the aerodynamics of tucked positions in competitive alpine skiing. To further our understanding of how a skier’s position affects the air flow and the resulting aerodynamic ...
    • An Empirical Model of Aerodynamic Drag in Alpine Skiing 

      Elfmark, Ola; Bardal, Lars Morten (Journal article; Peer reviewed, 2018)
      This paper describes an empirical model of aerodynamic drag for a range of body positions commonly used in alpine skiing. In order to calculate the drag coefficient (CD), a method for calculating the frontal area of an ...
    • Assessment of the steady glide phase in ski jumping 

      Elfmark, Ola; Ettema, Gertjan; Gilgien, Matthias (Peer reviewed; Journal article, 2022)
      The purpose of this investigation was to compare how key variables of the steady glide phase relate to performance in the two hill sizes used in World Cup and Olympic competitions, i.e, normal and large hills. In this ...
    • Blockage Correction and Reynolds Number Dependency of an Alpine Skier: A Comparison Between Two Closed-Section Wind Tunnels. 

      Elfmark, Ola; Reid, Robert Cortas; Bardal, Lars Morten (Peer reviewed; Journal article, 2020)
      The purpose of this study was to investigate the impact of blockage effect and Reynolds Number dependency by comparing measurements of an alpine skier in standardized positions between two wind tunnels with varying blockage ...
    • Kinematic Determination of the Aerial Phase in Ski Jumping 

      Elfmark, Ola; Ettema, Gertjan; Jølstad, Petter Andre; Gilgien, Matthias (Peer reviewed; Journal article, 2022)
      The purpose of this study was to find a generic method to determine the aerial phase of ski jumping in which the athlete is in a steady gliding condition, commonly known as the ‘stable flight’ phase. The aerial phase of ...
    • Modelling of Aerodynamic Drag in Alpine Skiing 

      Elfmark, Ola (Master thesis, 2017)
      Most of the breaking force in the speed disciplines in alpine skiing is caused by the aerodynamic drag, and a better knowledge of the drag force is therefore desirable to gain time in races. In this study a complete database ...
    • Performance analysis in ski jumping with a differential global navigation satellite system and video-based pose estimation 

      Elfmark, Ola; Ettema, Gertjan; Groos, Daniel; Ihlen, Espen Alexander F.; Velta, Rune; Haugen, Per; Bråten, Steinar; Gilgien, Matthias (Peer reviewed; Journal article, 2021)
      This study investigated the explanatory power of a sensor fusion of two complementary methods to explain performance and its underlying mechanisms in ski jumping. A differential Global Navigation Satellite System (dGNSS) ...
    • The Effect of Arm Positions on Flow Around an Alpine Skier 

      Støre, Jonas Østergaard (Master thesis, 2021)
      There have been limited research increasing knowledge of flow around an alpine skier, and the effect of different arm positions. In this study, a wind tunnel experiment were conducted testing five different arm positions ...