Preliminary cargo ship dimensioning

in conceptual design stage

Using following on-line programa you can get an approximate dimensioning of main particulars for your intended cargo ship design or you can get an aprox. value of some important ship's feature from actual ships whose particulars are not accesible to you.

When using this program the main goal is not exactness but speedy answers with small effort. You will be able to analyze many alternatives just in minutes not hours.

Click on next button and select your interest from the menu:

                                                                        

Click on

GETXOSHIP

Un blog de barcos y construcción naval

A ships' and Shipbuilding blog

para / for

Ingenieros   Naval archs.

Constructores  Shipbuilders

Navegantes  Mariners

Aficionados al mar  Sea Lovers 

World maritime day

 IMO celebrates World Maritime Day 

25 of September 2014

Today September 25th, IMO: International Maritime Organization  celebrates the World Maritime Day, designated by the United Nations to focus global attention to the safety of navigation and protection of the marine environment. 

This year theme of the World Day has been the implementation of international conventions issued by the IMO, noting that after the long work meetings and discussions by the working committees, after the approval of the relevant agreements, after the IMO promulgation of the formal agreements, it is necessary that the participating countries implement the adoption in their territories, by adapting and providing the necessary facilities and conducting training activities for the staff concerned and an effective compliance control. 

In the IMO website, the following video of the speech by IMO Secretary-General, Mr. Koji Sekimizu  during this day celebration, is shown

"EDT Hercules" leaves the shipyard

"La Naval" from Sestao (Spain) last ship 

Time elapses very quickly, more than we usually realize. Yesterday we saw the departure of "La Naval" shipyard's last ship, built there and named "EDT Hercules", and she is the last because there is no one behind to build ... until they get new contracts. This situation is similar to that which occurred about 8 years ago, when this historic shipyard, "La Naval", changed ownership from public Izar to private Construcciones Naval del Norte (CNN).

By that date, October 2006, the LNG gas carrier "Bilbao Knutsen" was launched,  and I put in my other blog a brief post on the launching, with a beautiful night photograph taken by my daughter Natalia. She was the last Izar ship but it was not the last "La Naval" ship, that continued building many ships, some very important.

Ship’s motions at sea

A vessel under sea has two types of movements:

• Desired, to move the ship from one point to another and get she achieves the objectives for which  was built
•  Unwanted, occurring mainly as a result of the waves and wind on the ship and causing trouble, inconvenience and danger to the vessel, persons and cargo, so they try to minimize them.

In this post I will only refer to the second type of movements, motions, relating to ships sailing on the surface.

The ship motion in a 3D space is made up, like any other solid, of the motion of its center of gravity and the movement or rotation around that point. The six possible motions, summarised in the following table, consist of three translations and three rotations, which refer respectively to the trajectory of the center of gravity and the rotations  around the main axes through it. Names are given in Spanish and English languages​​.

Reference axis	Translations	Turns r/ ref. axis
Longitudinal x	surge (avance)	roll (balance ó rolido)
Transversal y	sway (deriva)	pitch (cabeceo)
Vertical z	heave (arfada)	yaw (guiñada)

In the following drawing the three axes are shown, for which the movements of translation and rotation relate.