抄録
The motorcycle is the vehicle which is not stable in right and left directions, because it runs with two wheels. In addition, the rider of the motorcycle sits astride directly and is not fixed on the seat. On the other hand, the influence of aerodynamics on a motorcycle is big as same as on a car. Therefore, the elucidation of aerodynamic characteristics of the running motorcycle is important when its safety is considered. In this study, the aerodynamic characteristics of 1/5-motorcycle models were measured in parallel-running states inside a low speed wind tunnel. The total pressure distributions in the wakes were also measured and visualized. As a result, the aerodynamic characteristics of the parallel-running motorcycles are strongly affected by the relative positions of the motorcycles and the sign of the yaw moment is changed in the passing-by maneuver, which can be dangerous to the driving.
