In this pack, you'll find a modified models_naval of FoTS steamer ships which enables sail logic.xml if inserted into the naval directory of the ship to work as proper sails. If you ever dabble in naval modding, you'll notice that if you transplant logic.xml of a sailing ship into steamer or oared rowing ship, the sails won't show up. This is because models_naval have something that determines this.
As you can see in the screenshot of the test pack, its just NTW ship of the line sails transplanted into FoTS L'Ocean. And it is functional, the sails reefs when it stops, unfurls when moving. There's two path possible from here on: Maintain the FoTS masts then plot the sails and rigging lines so it matches it; or removing the FoTS masts replacing it with masts that are part of the rigging logic.xml instead of the ships' rigidmodels.
Here's the link to the test pack:
https://www.dropbox.com/s/b45o52lbns...test.pack?dl=0
How to use: Replace or edit the logic.xml inside the rigidmodels>naval of the ships.