A bicycle power generating arrangement includes a dynamo, a rack mounted on the frame of a bicycle and adapted to hold said dynamo, and wheel means coupled to the rack and disposed in contact with the ground and rotated to actuate the dynamo upon running of the bicycle, causing the dynamo to generate electricity. The sports paraphernalia are instrumented with a variety of TV cameras, microphones, and bi-directional communication electronics. When the carbon fiber is then subjected to a heat treatment in an oxidizing atmosphere, the layer link sections are released, whereby the edges of the hexagonal carbon layers are exposed at the large ring ends in a regularly arranged manner. The shutter structure is disposed on the outlet and includes guiding plates, a connecting rod, and an operating element. In addition, the discharge path is formed to extend from the opening in a forward direction of a turning direction of the air flowing in the helical flow path.