Patent ID: 9725147
Date: 2017-08-08
CPC Classifications: B63H

Claim:
1. A thruster system comprising: a canister on which a thruster is installed, and which is movable upward and downward in a hull along a first direction; a wire controller which controls a wire connected with the canister and enables a movement of the canister along the first direction; and a partition wall which partitions a corner space of the canister to define a ballast tank, the ballast tank extends along the first direction and has a same dimension as the canister in the first direction, wherein the canister is moved along a trunk which is a part of the hull at each of a dynamic positioning mode in order to move a vessel or a marine structure, a transit mode in order to allow the vessel or the marine structure to sail, and a respective mode in order to do maintenance of the thruster and an amount of water filled in the ballast tank changes as the canister is moved relative to the water surface along the first direction to thereby offset a buoyancy applied to the canister.