Conservation of energy is what makes it possible, once the ship is moving you keep drawing energy from the wind. here’s a small windpowered boat sailing https:

Conservation of energy is what makes it possible, once the ship is moving you keep drawing energy from the wind. here’s a small windpowered boat sailing https://m.youtube.com/watch?v=nr7g-03iclA https://m.youtube.com/watch?v=nr7g-03iclA You can also use more powerful wind from high above the sea. This article is on using high altitude kites for power. https://www.maritime-executive.com/editorials/sailing-into-headwinds-using-wind-power https://www.maritime-executive.com/editorials/sailing-into-h...