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A ????sail is a novel form of marine propulsion, and provides significant advantages over traditional, "soft" sailing rigs. To do so, it exploits higher maximum lift coefficients than such rigs. ????sail craft can be built so that they are controlled by a single driver via a steering wheel and a forward/stop/reverse lever, such as is typical of large motor-powered boats.
This simplicity also makes sailing accessible to those who are inexperienced or disabled, who would not be able to sail under conventional rigs.
????sails have an eco-friendly potential, offering manoeuvrability and flexibility for wind-powered propulsion where motors would normally be used.