Ship Design

• how many shafts, or whether azimuthing pods are used;

• type of propeller; fixed or controllable pitch, ducted;

• shaft revolutions.

The designer must work closely with the owner in deciding many of these issues as the owner will often have a legitimate interest in the decisions made. In the case of the main propulsion plant, for instance, the new ship may be joining a fleet which to date has been exclusively diesel driven. If the new ship goes over to gas turbine drive the owner will have to arrange for retraining of the engine room staff and will face additional logistics problems in providing spares. It is sometimes considerations of this sort that lead to the industry getting an undeserved reputation for being unwilling to introduce change.

In addition to meeting an owner's requirements there are a wide range of international and national regulations to be met and standards which may originate with the owner or builder. The regulations are touched upon in the next chapter. They represent minima which good operators will often choose to exceed. The standards may relate to the levels of accommodation to be provided for crew and passengers.

As decisions are made on how best to meet the stated requirements the ship gradually takes shape. Its size, layout and the equipments to be fitted will emerge. Everything in the ship must serve a useful purpose. Thus:

• The machinery must provide enough power to achieve the desired speed.

• Hoisting gear of a certain capacity will be needed to load and offload the cargo. Here the facilities in the ports the ship is to use must be taken into account.

• The hull, with its sub-division, must provide a safe vehicle for the intended service. For instance it may need to be strengthened if the ship is to operate in ice.

• The electrical system must provide adequate power for all machinery to be run, allowing for the fact that not all of the installed equipments will be needed at the same time. For instance, cargo handling gear may only be needed in port.

Margins, in the form of extra capacity and/or redundancy will be needed to allow for changes during the service life and to provide the desired level of availability of any function.

In the case of warships the government, as represented by the navy, or Ministry of Defence, is effectively the owner. It is the naval staffs who specify what is needed to enable the navy to meet its commitments in support of the country's foreign policy.


How To Have A Perfect Boating Experience

How To Have A Perfect Boating Experience

Lets start by identifying what exactly certain boats are. Sometimes the terminology can get lost on beginners, so well look at some of the most common boats and what theyre called. These boats are exactly what the name implies. They are meant to be used for fishing. Most fishing boats are powered by outboard motors, and many also have a trolling motor mounted on the bow. Bass boats can be made of aluminium or fibreglass.

Get My Free Ebook

Post a comment