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    • Development of an Ultralight with a Ducted Fan 

      Author: Brabec , Jiří; Helmich , Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2012)
      This paper introduces the UL-39 project, an ultralight aircraft with a ducted fan, and some of the problems that have arisen in the course of its development. Several problems with the design of a non-traditional aircraft ...