Thinking about small (15-20’) sailboats with solar electric motor drives today. Demands for such motors for small fishing boats and general improvements in EV tech mean that electric drive for this size boat might be fairly practical, provided you aren’t motoring for hours as the primary locomotion.
On that thread, this earlier post provides a graph of speeds rowing, augmented rowing, and electric motoring: http://forum.woodenboat.com/showthread.php?261007-Electric-boost-for-a-camping-rowboat&p=6175091#post6175091
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