A typical large windjammer from the final years of sail carried about half that sail area on a vastly smaller ship; lengthwise about half, but the displacement/

A typical large windjammer from the final years of sail carried about half that sail area on a vastly smaller ship; lengthwise about half, but the displacement/tonnage difference would be huge. So yes, this seems quite underpowered, even taking into account that the modern airfoil shaped sails are certainly more efficient and have less windage than a traditional square rig. My guess is that the idea is that in low winds they use the engine to boost speed. E.g. https://en.wikipedia.org/wiki/Herzogin_Cecilie https://en.wikipedia.org/wiki/Herzogin_Cecilie