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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