| 摘要 |
A propulsion device comprises a circular series of inclined airfoil elements. Each airfoil element is connected along its upper side to a rigid plate member, which is adapted to be rotated at high speed via a motor output shaft. The airfoil elements are oriented on the plate such that their vacuum-inducing surfaces face upwardly and outwardly of the circular series, and their pressure surfaces face downwardly and inwardly of the circular series.
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