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 heading up near the top would be helpful, maybe with a circular dial you can select like the compass or broad reach displays. Kinda weird when the boat flips completely around to head left.
Some kind of visual representation on the Boom Vang, Cunningham, Outhaul, Backstay, and Jib Lead would also be helpful, since it's really difficult to tell if they're actually doing anything. Maybe a transparent deformation magnified overlay showing the sail profile surface deformation extended away from the actual sail in extreme distortion. Otherwise the changes are so minute its challenging to perceive.
Otherwise, it's a cool demo, and seems to be (from a not especially experienced sailor) relatively realistic of the forces involved. Suggested extension would be showing the wind flowing off the sails and how the forces transition. Also, showing other boats, particularly something complicated like a Windjammer [1], Full-Rigged Ship [2] or Schooner [3] varieties.
Also cool, simply because so few submissions seem to deal with sailing, boats, and generally water transport principles. Lots of possible VC ideas related to sails and sailboats. MarineTraffic [4] is currently tracking 300,000 ships out on the world oceans, and surprisingly small number use any form of sail based propulsion. Route planning and "this much cargo to this area with this speed of delivery" estimation relative to money spent on oil and fuel for a normal ship would likely be possible. From this Quora answer (suggested by Google) a small container ship (something with 15000 kW, 2000-3000 TEU capacity, maybe a Feedermax ship) might use 2000 tons of fuel crossing the Pacific (maybe $500,000 to $1,000,000 of fuel) [5]. This paper [6] has a much more complicated breakdown if you're interested in those types of calculations.
Also quite a bit with drones, and automated sailing. [7][8] Even a decent amount with land propulsion [9] that's been explored occasionally and there's even a tiny amount with space probes and planetary rovers as concepts [10].
[1] https://en.wikipedia.org/wiki/Windjammer
[2] https://en.wikipedia.org/wiki/Full-rigged_ship
[3] https://en.wikipedia.org/wiki/Schooner
[4] https://www.marinetraffic.com
[5] https://www.quora.com/How-much-does-it-cost-to-fuel-a-cargo-...
[6] https://www.man-es.com/docs/default-source/document-sync/pro...
[7] https://en.wikipedia.org/wiki/Unmanned_surface_vehicle
[8] https://www.saildrone.com/
[9] https://en.wikipedia.org/wiki/Land_sailing
[10] https://en.wikipedia.org/wiki/Zephyr_(rover)