U.S. patent # 8,739,720

  • can set balanced sail with single spar
  • sickle shape offers balanced rotation
  • utilizes swept-back, efficient, aerodynamic cross sections
  • can present self-rotating curvature along full length of mast in airflow
  • not a conventional wing rig so does not misbehave at anchor (can be turned off quickly and completely!)
  • stores well along gunwale of average boat
  • looks cool to art majors and bird lovers

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