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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