Coeficiente de bloque

Hay poco que rascar porque es una definición !!!

http://www.iacs.org.uk/document/public/Publications/Resolution_changes/PDF/UR_S2_Rev1_pdf1324.pdf

Definition of Ship's Length L and of Block Coefficient Cb

S2.0 Application

This UR does not apply to CSR Bulk Carriers and Oil Tankers.

S2.1 Rule length L

The length of L is the distance, in metres, on the summer load waterline from the fore side of the stem to the after side of the rudder post, or the centre of the rudder stock if there is no rudder post. L is not to be less than 96%, and need not be greater than 97%, of the extreme length on the summer load waterline. In ships with unusual stern and bow arrangement the length L will be specially considered.

S2.2 Block coefficient Cb
The block coefficient Cb is the moulded block coefficient at draught d corresponding to

summer load waterline, based on rule length L and moulded breadth B:

Cb = moulded displacement [m3 ] at draught d / LBd 

Efecto Squat

Fórmula de cálculo[editar]

Fue obtenida por el Doctor C.B. Barrass, del Dept. of Maritime Studies, del Liverpool Polytechnic, como resultado del análisis de 300 casos en laboratorio con modelos a escala y otros de la práctica real.

 Navegación en aguas poco profundas abiertas.

 Navegación en aguas poco profundas restringuidas (Canales).

Donde:

•  es el valor en metros del efecto squat.
•  es la velocidad de buque en nudos.
•  es el coeficiente de block o bloque.

Por lo que se desprende que el efecto de "aumento de calado" es directamente proporcional al cuadrado de la velocidad y al coeficente de block.

Squat effect

From Wikipedia, the free encyclopedia

The squat effect is the hydrodynamic phenomenon by which a vessel moving quickly through shallow water creates an area of lowered pressure that causes the ship to be closer to the seabed than would otherwise be expected. This phenomenon is caused when water that should normally flow under the hull encounters resistance due to the close proximity of the hull to the seabed. This causes the water to move faster, creating a low-pressure area with lowered water level surface (See Bernoulli's principle). This squat effect results from a combination of (vertical) sinkage and a change of trim that may cause the vessel to dip towards the stern or towards the bow.^[1]

Squat effect is approximately proportional to the square of the speed of the ship. Thus, by reducing speed by half, the squat effect is reduced by a factor of four.^[2] Squat effect is usually felt more when the depth/draft ratio is less than four^[2] or when sailing close to abank. It can lead to unexpected groundings and handling difficulties.

It is believed to have been one of the causes of the 7 August 1992 grounding of the Queen Elizabeth 2 (QE2) off Cuttyhunk Island, nearMartha's Vineyard. It is also known to have been a factor in the collision of the bulk carriers Tecam Sea and Federal Fuji in the port of Sorel,Quebec, in April 2000.^[1]

GT - TRB

A lo que parece las Ton de TRB y de GT miden lo mismo: 2,83 m-cúbicos

http://en.wikipedia.org/wiki/Ship_measurements

Ton - The unit of measure often used in specifying the size of a ship. There are three completely unrelated definitions for the word. One of them refers to weight, while the others refer to volume.

Measurement Ton or Ship Ton Calculated as 40 cubic feet of cargo space. (Abbreviated M/T). See Bale Cubic - example, a vessel having capacity of 10,000 M/T has a bale cubic of 400,000 cubic ft.

Register Ton - A measurement of cargo carrying capacity in cubic feet. One register ton is equivalent to 100 cubic feet of cargo space.

Weight Ton - Calculated as a long ton (2,240 pounds) (abbreviated W/T)

Tonnage - A measurement of the cargo-carrying capacity of merchant vessels. It depends on not on weight, but on the volume available for carrying cargo. The basic units of measure are the Register Ton, equivalent to 100 cubic feet, and the Measurement Ton, equivalent to 40 cubic feet. The calculation of tonnage is complicated by many technical factors.

Gross Tons - The entire internal cubic capacity of the ship expressed in tons of 100 cubic feet to the ton, except certain spaces with are exempted such as: peak and other tanks for water ballast, open forecastle bridge and poop, access of hatchways, certain light and air spaces, domes of skylights, condenser, anchor gear, steering gear, wheel house, galley and cabin for passengers.

Net Tons - Obtained from the gross tonnage by deducting crew and navigating spaces and allowances for propulsion machinery.

Re: Rv: documentación de seguridad

Dynamic Positioning from A to Z (Part III)

				Dynamic Positioning from A to Z (Part III) The final part of the Dynamic Positioning article where you find out how to become a DP operator and what are the training centers organizing the course.
				Ver en www.nedcon.ro	Vista previa por Yahoo

 

El Viernes 5 de diciembre de 2014 13:04, Diana Díaz Guazo <ddgmontesclaros@yahoo.es> escribió:

Nedcon Maritime - Marlins and TOSE approved center

				Nedcon Maritime - Marlins and TOSE approved center In February 2004 Nedcon was certified as a Marlins Approved Test Centre in conformity with standards agreed by the UK Maritime and Coastguard Agenc...
				Ver en www.nedcon.ro	Vista previa por Yahoo

 

El Lunes 24 de noviembre de 2014 13:59, Diana Díaz Guazo <ddgmontesclaros@yahoo.es> escribió:

Más sobre seguridad...

Re: Rv: documentación de seguridad

Nedcon Maritime - Marlins and TOSE approved center

				Nedcon Maritime - Marlins and TOSE approved center In February 2004 Nedcon was certified as a Marlins Approved Test Centre in conformity with standards agreed by the UK Maritime and Coastguard Agenc...
				Ver en www.nedcon.ro	Vista previa por Yahoo

 

El Lunes 24 de noviembre de 2014 13:59, Diana Díaz Guazo <ddgmontesclaros@yahoo.es> escribió:

Más sobre seguridad...