Search results
Results from the WOW.Com Content Network
The centre of gravity of the ship is commonly denoted as point G or CG. When a ship is at equilibrium, the centre of buoyancy is vertically in line with the centre of gravity of the ship. [1] The metacentre is the point where the lines intersect (at angle φ) of the upward force of buoyancy of φ ± dφ. When the ship is vertical, the ...
The job of the naval architect is to make sure that the center of buoyancy shifts outboard of the center of gravity as the ship heels. A line drawn from the center of buoyancy in a slightly heeled condition vertically will intersect the centerline at a point called the metacenter. As long as the metacenter is further above the keel than the ...
An inclining test is a test performed on a ship to determine its stability, lightship weight and the coordinates of its center of gravity.The test is applied to newly constructed ships greater than 24m in length, and to ships altered in ways that could affect stability.
The vertical/Z axis, or yaw axis, is an imaginary line running vertically through the ship and through its centre of mass. A yaw motion is a side-to side movement of the bow and stern of the ship. The transverse/Y axis, lateral axis, or pitch axis is an imaginary line running horizontally across the ship and through the centre of mass. A pitch ...
Windsurfers employ lift vertical to the water to reduce drag on the board by leaning the sail towards the wind. The approximate locus of net aerodynamic force on a craft with a single sail is the centre of effort (CE) at the geometric centre of the sail. Filled with wind, the sail has a roughly spherical polygon shape and if the shape is stable ...
Initial stability or primary stability is the resistance of a boat to small changes in the difference between the vertical forces applied on its two sides. [1] The study of initial stability and secondary stability are part of naval architecture as applied to small watercraft (as distinct from the study of ship stability concerning large ships).
However, its investigation revealed errors in the wind overturning moment calculations performed by the shipbuilder and approved by ABS. Erroneous instructions in the operator's manual would allow the ship to be operated with the height of the vertical center of gravity above accepted limits, resulting in reduced stability margin.
While it may seem counter-intuitive that placing water in the hull (which is, after all, close to the same density as the water outside the hull – fresh vs salt water) would add any stability, the water serves to displace air from the bottom of the hull; adding water ballast below the vertical center of gravity increases stability.