Ducted fan
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United States of America Patent
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-
May 22, 1990
Grant Date -
N/A
app pub date -
Jan 9, 1989
filing date -
Jan 9, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ducted fan including a funnel-shaped duct positioned upstream of the impeller and connected to a base, an outer cowling concentrically positioned downstream and attached to said duct through a series of ribs, an inner cowling positioned inside the outer cowling and surrounding the impeller and a circular grill attached to the discharge end of the inner cowling. The grill including a center hub and a series of arcuate-shaped ribs extending outwardly from the hub and having a constant curvature of less diameter than the outside radius of the grill whereby the maximum lateral spacing between the ribs is at a radius inboard from the outside radius of the grill.
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