Hydrostatic Parameters of a Ship | |||||
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The following are the computed hydrostatic parameters:
| Parameter | Description | Type |
|---|---|---|
| Draft (T) | Height of the water line from the lowest point of the ship. | Length |
| LWL | Length of the hull measured between the front perpendicular and the aft perpendicular along the waterline. | Length |
| BWL | Width of the hull measured along the waterline. | Length |
| CoG | Center of gravity of the hull. | Point |
| CoB | Center of buoyancy of the hull. | Point |
| Volume | Immersed volume of the ship. | Volume |
| Displacement | Weight of the water displaced due to the immersed volume of the ship. | Mass |
| WPA | Water plane area. It is the area of the hull at the intersection with the water plane. | Area |
| WSA | Wetted surface area. It is the total surface area of the hull and appendages below the waterline. | Area |
| Ix | Moment of inertia relative to the x-axis. | Inertia |
| Iy | Moment of inertia relative to the y-axis. | Inertia |
| Mt | Transversal metacenter. | Point |
| Ml | Longitudinal metacenter. | Point |
| BMt | Transversal metacentric radius of the ship. It is the vertical distance between
the center of buoyancy and the transversal metacenter. BMt = Ix/Immersed Volume |
Length |
| BMl | Longitudinal metacentric radius of the ship. It is the vertical distance
between the center of buoyancy and the longitudinal metacenter. BMl = Iy/Immersed Volume |
Length |
| LCF | Longitudinal center of flotation. It is the distance of the center of flotation from either of the perpendiculars or the mid-ship, along the waterline. | Length |
| LCB | Longitudinal center of buoyancy. It is the distance of the center of buoyancy from either of the perpendiculars or the mid-ship, along the waterline. | Length |
| VCB | Vertical center of buoyancy. It is the distance of the center of buoyancy from the keel, along the centerline of the ship. | Length |
| KMt | Transversal metacentric height. It is the distance between the keel and Mt. | Length |
| KMl | Longitudinal metacentric height. It is the distance between the keel and Ml. | Length |
| GZ | Distance between G (CoG) and Z. | Length |
| Ax | Maximum cross-sectional area of the immersed volume of the ship in the longitudinal direction. | Area |
| Cb | Block coefficient Cb = Volume/(LWL*BWL*T) |
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| Cp | Prismatic coefficient Cp = Volume/(LWL*Ax) |
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| Cwp | Waterplane coefficient Cwp = WPA/(LWL*BWL) |
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