PROBLEM TO BE SOLVED: To improve generating efficiency by providing a starting propeller strong in turning force with a large number of blades and wide blade width and moreover large in the blade twist angle, and an operating propeller heightened in rotating speed with narrow blade width and a small twist angle, and connecting both propellers to a rotating shaft of a generator. SOLUTION: An operating propeller 2 excellent in high speed rotation with narrow blade width and a small twist angle is fitted to a rotating main shaft of a generating motor 5, and a starting propeller 1 strong in turning force with a large number of blades and wide blade width and moreover large in the blade twist angle is linked with the rotating main shaft through a unidirectional rotation transmission device hub body 4. The generating motor 5 is mounted on a support base changed in direction according to a wind direction. A tail assembly divided in at least three pieces to have different angles is fitted to the support base, and the propeller is turned in the wind direction. The divided tail assembly 6 is fitted to a tail assembly arm 8 by clamps 9 or the like so as to be bent only upward.
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