There has been a lot of interest in the sailboat world in the self-trimming wingsail. This is a normal wingsail, with or without flaps, and with either of the common methods of tacking--symmetrical aerofoil section, or rotating the wing about the roll axis.
A boom(s) and an adjustable vertical tail aerofoil are added to allow the wing to automatically align itself for zero lift when moored, or for desired power while underway, without the need for a sheet or for worries about reacting quickly to wind shifts.
I am very curious about whether a practical small self-trimming wingsail could be designed a canoe or kayak (without outriggers).
Has anyone tried it?