Earlier quoted context omitted.
Little confused. So you're mostly giving credit to a demo that then inspired your own demo? Either way, both demos are fairly interesting, especially since there's so little exploration of sailing and the physics involved most of the time. The second sailrhythm demo seems rather high quality and a better representation of the physics involved. Not sure if you're planning to work on it further, yet putting the rudder…
SailRhythm is a bit WIP, so didn't want to share too early! Thank you so much for the detailed feedback. I do have plans to implement wind flow visualization and have a way to visualize forces as well. Controls a bit tricky to do, but this is definitely something I've been pondering. As you said, at certain headings the changes sometimes are too small to perceive.
Another thought of (if there's actually further interest in this kind of software) would be middleware like SpeedTree (https://en.wikipedia.org/wiki/SpeedTree). Seems like sailing games have been pretty popular lately (Sea of Thieves (40m player base), Assassin Creed IV (15m)) so there's probably at least some market for modestly priced middleware that handles sailing physics.