MANAGING OF POSITION OF PIVOT POINT ONBOARD TWIN-SCREW CONVENTIONAL VESSEL

Abstract

In article the principles of managing of position of pivot point(PP) onboard twin-screw conventional vessel with bow thruster are offered.

Position of pivot point during maneuvering is very important to fulfill maneuver expected and possibility to manage position of PP gives considerable advantages for correct and save fulfilling of maneuver.

Changing set of thrusters in operation and position of rudders on the vessel dead in the water, it’s possible to shift position of PP in any desired position regarding centre of gravity along central line (from centre of gravity to infinity ahead and astern).

In case vessel has speed through the water picture is a little bit changing.

Classical situation is when on headway shifting the rudder to any angle we move PP to the bow. Also on sternway we can use bowthruster as rudder. PP in such case will move to the stern.

At slow speed we can change position of PP applying transversal force a the side regarding middle  opposite to desired position of PP.