On a ship the collected forces cause a net motion as shown below:
There is a concern in this image that I didn't raise in the previous post. What happens when the breeze is coming from the fore, rather than the aft, of the ship? So long as the sail can be angled properly and the wind is coming from at least a little behind, or even directly to the side, of the desired direction then this image is roughly accurate. When it comes from ahead, though, that pressure force that normally would be compensated for by the keel becomes a serious problem:
This is a pretty complex maneuver used in real sailing, one that I can't possibly do justice to here. In short, it involved keeping the desired momentum more or less opposite the direction of the prevailing wind. The ship constantly moves back and forth about that vector, so the wind is always coming slightly to either side. In this case so long as the forward component of Lift is greater than the backwards components of Drag and Pressure then the ship will continue moving forwards. Since the sideways components of the two orientations are opposite each other they cancel out over time and the drift is minimal. Unfortunately the effect of pressure here will make this a much less effective maneuver than it is for a ship at sea, but it ensures the ship can maintain forward velocity regardless of the direction of wind.
I haven't bothered here with the particulars of design or calculation, the majority of which was done in the first post. While the new issues raised here would impact any real attempt to construct such a vehicle we've also seen that such issues could be overcome by a sufficiently dedicated designer. There is a combination of hull and sail design that would make this work. That is enough for now, unless we want to start really building one.