| 摘要 |
A centripetal impeller to impart a force and having an attachment piece defining an axis of revolution. The impeller has a movable arm pivotable relative to the attachment piece so that the movable arm is a distance r from the axis of revolution. The impeller includes a rotation device coupled to the attachment piece causing the attachment piece to rotate along the axis of revolution. A variable force device is attached to the movable arm to produce a force on the movable arm toward the axis of revolution so as to cause a net force along the axis of revolution.
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