The Features of the Landing Slope of a Ski Jumping Hill That Need to be Considered

This paper describes the features of the landing slope of a ski jumping hill that need to be considered. A ski jumping hill is composed of the in-run, the take-off table, the landing slope and the out-run. The features of the landing slope that we have considered are the construction fee, the safety of the landing slope, the long flight distance for the interesting game and the difficulty for unskilled jumpers. The construction fee was estimated on the basis of the amounts of material that need to be removed from and brought in to the existing Zao jumping hill in Yamagata city. The safety on landing was estimated on the basis of the landing velocity. The landing velocity is the velocity component perpendicular to the landing slope at the instance of landing, and this needs to be small to reduce the impact and make the landing safer. In order to estimate the landing velocity and the flight distance, it is required to simulate the flight trajectory. The difficulty for unskilled jumpers is estimated on the basis of the variance of the flight distance. It is considered that the flight distances for unskilled jumpers are less than for skilled jumpers because they are unable to satisfy the optimal conditions from take-off through to landing. Therefore, a landing slope for which the variance in the flight distance is large is defined as a difficult slope for unskilled jumpers.