Abstract
We have measured the aerodynamic forces during the landing phase for a V-style as well as the free flight phase by employing a full size modelin a wind tunnel. A full size model of a ski jumper was mounted in 6.5m×5.5m low-speed wind tunnel at JAXA. In the case of the ground effect experiment, the ground plate was set over the whole test section. The height of the ground plage was varied in this series of experiments. It was found that the lift depends on the height difference between the ground plate and the tail of skies. The lift increases with decreasing the height difference when the angle of attack is positive. On the other hand, the lift decreases with decreasing the height difference when the angle of attack is positive.
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