Device for diminishing flow resistance in moon pool

A device for diminishing flow resistance in a moon pool, the device comprising a guide structure having a lattice shape, the guide structure comprising:

• a plurality of horizontal guide plates spaced apart from each other along a longitudinal direction of a hull, the horizontal guide plates being arranged in a plurality of rows along a lateral direction of the hull;
• a plurality of guide ramps arranged in a plurality of rows along the lateral direction of the hull, the guide ramps being coupled at rear ends thereof to front ends of the respective horizontal guide plates, wherein front ends of the guide ramps are inclined upwards towards a bow side of the hull and spaced apart from rear ends of the adjacent fore horizontal guide plates;
• a plurality of longitudinal reinforcing beams arranged in a plurality of rows along the longitudinal direction of the hull, the longitudinal reinforcing beams being coupled to the corresponding horizontal guide plates and the corresponding guide ramps;
• and
• a hinge axis around which the lattice guide structure is rotated in the moon pool towards a transit position or a working position.