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:confused: I'm wondering the technical probability and viability of what's practically mobile sea fortresses with 15th to 17th century technology.

First, a slab-like concrete ship, since concrete was already known by the romans and it floats. I believe it would probably look somewhat similar to the japanese atakebune or tekkõsen. The propulsion system still eludes me.

The second would be a catamaran-style hull inspired by the Tessarakonteres of Ptolemy IV, propeled by waterwheels which in turn are powered by horizontal windmills. I chose horizontal windmills because they can be enclosed inside towers for greater protection during battle, but I'm wondering if the ship would actually be able to move at all. The crude drawing attached is meant to represent this ship.

Is it possible?

Ps: I'm sticking to solely the technical aspects because this is meant for a fantasy setting, and it isn't in ASB because of my personal guideline is to refrain from magic justification unless necessary.

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