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Hamamatsu Corp. - Earth Innovations LB 2/24

Lidar Measures Wake Vortices

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Brent D. Johnson

When a large passenger aircraft takes off or lands, it displaces a sizable volume of air that trails off the wings in a phenomenon known as a wake vortex. This invisible wake whirls up to 100 mph, leaving behind a horizontal tornado with a position and magnitude that pilots and air traffic controllers can only guess at. The scale of this hazard is demonstrated by the National Transportation Safety Board's speculation that wake vortices played a role in the crash of American Airlines Flight 587 last year in Belle Harbor, N.Y. To enhance the use of runways in inclement weather, laser...Read full article

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    Published: September 2002
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