The answer is that Xie Zhi is making...propellers and bearings.

Of course, what is being transformed is not the sailboat being tossed, it is just raw materials.

Xie Zhi plans to add new equipment to the three main battleships of his own. Isn't propeller propulsion good? Not to mention the speed bonus, and there is no need to rely on sails for power, and it can maintain high speed even if there is no wind.

But Xie Zhi didn't make an engine, so what to use to drive the propeller?

Dynamic nature

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