Li Si Te had just arrived in this world when the Sapphire Duchy was at the forefront of naval technology, just entering the Age of Transverse Sail.
Subsequently, Li Si Te introduced longitudinal sails, and hybrid power sailing ships became the main naval force of the Flame Kingdom. All internal maritime trade within the Flame Islands and every Pioneer Mandate war used hybrid power sailing ships. Even fishing boats out at sea used a combination of transverse and longitudinal sails.
But even the advanced hybrid power sailing ships couldn't escape the limitations of sailboats, which must rely on wind power.
Therefore, he had been having the arcanists of the Royal Arcane Academy research steam engines that could be powered by boiling water. However, steam engines involved many mechanical components and couldn't be completed overnight, especially since the arcanists here were not sensitive to purely mechanical creations.