| 摘要 |
In order to continuously rotate an impeller having an axis parallel to a ground surface in one direction to generate lift, a cover close to a periphery in an opposite lift side is provided within a half of an outer periphery of the impeller, and a cylindrical scroll wheel integrally and concentrically rotating with the impeller is provided in a cavity portion near a root of the impeller, whereby a balance between the lift side and the opposite lift side is broken aerodynamically.
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