Ski jumping is a sport which competes the flight distance and the flight form, and jumpers attempt to fly as far as possible. In the regulations for ski jumping competition, the outstretched fabric must show a medium air permeability of a minimum of 40 liters per m^2/sec with 10 mmAq differential pressure. However, the effect of the air permeability of ski jumping suits on aerodynamic characteristics has not been completely clarified yet. The purpose of this study is to investigate the effect of air permeability of jumpsuit fabrics on aerodynamic characteristics, and three types of fabric with different air permeability are examined from aerodynamic point of view. The wind tunnel experiments were carried out using the fabric clothed elliptic cylinder. The aerodynamic forces and static pressure distribution were measured for three types of fabric with different air permeability. For Gap-2 (high air permeability case), the angle of stall increases in contrast to the other cases. The boundary layer flow is affected by the air permeability of the fabric clothed elliptic cylinder.
The Proceedings of Joint Symposium: Symposium on Sports Engineering, Symposium on Human Dynamics
