Patent ID: 6139439
Filing Date: 2000-10-31
Classification: A63G,B64D,F04D

Abstract:
A mechanism for vertically linearizing an unconfined upward air flow generated by a free-standing multi-bladed propeller rotated about a vertical axis when disposed above the rotating propeller, comprising:an open first cylindrical element adapted to be disposed coaxially with and above a central portion of the propeller; anda plurality of vertically planar, evenly separated, first guide vanes disposed radially of said vertical axis, said first guide vanes each being connected at a radially inside end to said cylindrical element and supported at a radially outside end so that respective elongate lower edges of the first guide vanes are adapted to be located in a first plane at a first height above a trailing edge of a blade of the propeller, so that the first guide vanes and the first cylindrical element cooperate to substantially linearize the upward airflow by themselves.