PIVOT POINT

PIER

PIER

PIER

DIW - BOTH TUGS EQUAL LEVERAGE

SLOW HEAD WAY- AFT TUG HAS MORE LEVERAGE

SLOW STERN WAY - FWD TUG HAS MORE LEVERAGE

Previous slide

Next slide

Back to first slide

View graphic version

REFERENCES: HOOYER, CHAP 1

Notes:

THIS SLIDE ILLUSTRATES HOW A ROTATIONAL MOTION IS CREATED AROUND THE PIVOT POINT WHEN A FORCE -- IN THIS CASE TUGS PUSHING THE SHIP -- IS APPLIED RELATIVE TO THE PIVOT POINT.

WITH EQUAL FORCE APPLIED, THE EFFECTIVENESS OF THE TUGS VARIES WITH THE LEVERAGE ARM VIS A VIS THE PIVOT POINT.

TUGS ARE ONE TYPE OF FORCE WHICH CAN BE APPLIED TO A SHIP. LET’S TAKE A CLOSER LOOK AT OTHER FORCES THAT AFFECT THE SHIP.