How does Mihawk's boat work?
It floats due to the buoyant nature of wood on water
How does it move?
Using wind as a propulsion system with sails
Its scared he might slice it to pieces so does whatever mi hawk desires
It's a basic Archimedes' principle - the upthrust acting on the boat is equal to the weight of the water displaced. This keeps the boat buoyant.
The wind blows and the boat moves
"This is primary school stuff, how can you not know this?!"
- Bilbo Baggins
What do you think?