User:Vincecate/KiteAndSeaAnchor
There are at least two companies making kites to pull ships:
* skysails * kiteship
With a two rope kite you can have it pull you to the left or right of downwind by maybe 75 degrees. So you can use it to pull you in the direction you want if you are mostly moving in the direction of the wind as you might with a User:Vincecate/Migration migration.