Block Coefficient (CB)
Block
coefficient of fineness is the ratio of the volume of displacement (∇)
of the molded form up to any waterline to the volume of a circumscribing solid
with length, breadth, and depth equal to the length, breadth and draught of
that waterline.
The
Block Coefficient (CB)
is given by,
CB =
∇
/L×B×T
Midship section area coefficient (CM)
The
fullness of the midship section is expressed by the midship section area
coefficient. It is the ratio of the midship section area to the circumscribing
rectangle, the width of which is equal to the molded beam at the load waterline
and the depth of which is equal to the molded draught at that waterline.
The
midship section area coefficient is given by,
CM
= AM / B×T
Water plane area coefficient (CW)
The
Water plane area coefficient influences the resistance and stability
considerably. It is geometrically related to shape of cross-sections. It is the
ratio of Water plane area to the circumscribing rectangle, the length of which
is equal to the length of the LWL and width of which is equal to the breadth at
that waterline. The value of CW is largely a function of CB
and sectional shape.
The
Water plane area coefficient is given by,
CW
= AW / L×B
Longitudinal Prismatic coefficient (CPL)
The
longitudinal prismatic coefficient is the ratio of molded volume of the ship up
to the designed waterline to the volume of prism having length equal to the
waterline length and cross-sectional area equal to the midship section area. It
is the ratio of CB to CM.
The
longitudinal prismatic coefficient is given by,
CPL
= CB / CM
Vertical Prismatic coefficient (CPV)
The
vertical prismatic coefficient is the ratio of molded volume of ship up to the
designed load waterline to volume obtained by the product of Water plane area
with the draught. It is the ratio of CB to CW.
The
vertical prismatic coefficient is given by,
CPV
= CB / CW
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