Hovering aircraft
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United States of America Patent
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-
Aug 3, 1999
Grant Date -
N/A
app pub date -
Dec 16, 1997
filing date -
Dec 19, 1996
priority date (Note) -
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Abstract
In a novel hovering aircraft, an airfoil blade structure rotatable about a vertical axis comprises a set of upper blades and a set of lower blades, all having variable lift, the upper blades converging toward the lower blades from root to tip. Struts, located inboard of the blade tips, keep the tips of the upper and lower blades separate from each other to reduce interference effects, and also support motors and propellers.
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