One
of the fundamental hull form characteristics required to prepare the
hydrostatic curves are the immersed sectional areas at ordinate stations. The
cross-sectional area of each ordinate station shown in the body plan up to the
waterline in question is determined which is the input into the calculation of
the volume of displacement; this set of curves is known as the Bonjean curves. A typical plot of the
bonjean curves is as shown in figure below. When plotted against the ship
length, the immersed areas at the ordinate stations form a sectional area curve, whose shape represents the fullness or
fineness of the ship form, an important consideration in ship resistance and
towing power.
The bonjean curves are
used:
- Bonjean curves are drawn on the profile of the vessel. With these curves, we can find the distribution of buoyancy for any waterline (any draft, any trim).
- To find out the volume of displacement and LCB at a trimmed waterline at which the ship is floating due to distribution of cargo or when the ship is floating on even keel.
- In subdivision of ships from the safety point of view so that when the ship is flooded due to accident or damaged, the ship does not sink beyond the margin line.
- In launching calculations, to determine the buoyancy and centre of buoyancy.
Where is the image?
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