Ludwig Kort (1888–1958[1]) was a German fluid dynamicist known for developing the ducted propeller, or Kort nozzle.
In an attempt to reduce canal erosion, Kort discovered that directing the wake of a propeller through a short, stationary nozzle also increased thrust.
[2] He submitted a U.S. patent for this technique, which was awarded in 1936.
[3] His research showed that the performance of ducted propellers heavily depended on the cross-section and thickness of the duct.
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