Abstract
Ski jumping is a sport which competes the flight distance and the flight form, and jumpers attempt to fly as far as possible. Ski jumping can be quantitatively treated from the aerodynamics point of view. The features of the ski jumping suit have an influence on the aerodynamic characteristics. 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 mm Aq differential pressure. However, the effect of the air permeability of ski jumping suits on the flight distance has not been completely clarified yet. The purpose of this study is to investigate three types of fabric with different air permeability from aerodynamic point of view, and the effect of air permeability of jumpsuit fabrics on the flight distance is examined. The wind tunnel experiments were carried out using the fabric clothed elliptic cylinder. The flight distance for each fabric was calculated with the aerodynamic force data assuming that the elliptic cylinder files.
