Abstract
The purpose of this paper was to clarify the effect of the arms position on the aerodynamic forces and moment during the early flight phase in ski jumping. The early flight phase is defined as 0.4 to 0.5 seconds after the take-off. We studied the aerodynamic effect caused by the arms positions during early flight phase by wind tunnel experiments and computer simulation. The results showed that the arms raised backward position during the early flight phase produced less lift and more nose-down pitching moment than the arms fitted to trunk position did. In the early flight phase, the arms fitted to trunk position could be more effective style than the arms raised backward position in terms of aerodynamics point of view.
