| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems of being difficult in manufacture itself in a method so far, and making selling difficult due to becoming extremely expensive, in manufacture of a rotary wing of a large diameter for a rotary wing plane with a shroud, a linear air blower and a liner wind power generator.SOLUTION: The rotary wing for the rotary wing plane with the shroud, the linear air blower and the linear wind power generator is provided by any of a dragonfly wing-like blade constituted of a tread 111, a riser surface 112 and a slope (an inclined face) 113 so that a cross section in a blade width (a blade chord) direction becomes step-wise, a J-shaped cross-sectional blade constituted only of the riser surface with the kicking-in length and the slope (the inclined face) except for the tread for constituting the dragonfly wing-like blade and a J-shaped back-to-back cross-sectional blade of constituting two sheets of J-shaped cross-sectional blades back-to-back. |
