Rotary blades
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United States of America Patent
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Feb 20, 1996
Grant Date -
N/A
app pub date -
Mar 8, 1994
filing date -
Mar 13, 1993
priority date (Note) -
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Abstract
A rotary blade includes a fixed boundary layer control device extending spanwise on a lower surface adjacent the trailing edge to improve the lift/thrust characteristics of the blade especially at positive incidence angles. It was discovered that expected detrimental effects at zero/negative incidence did not materialize and the reasons are identified. Such blades are particularly useful for helicopter sustaining and anti-torque rotors.
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