A propeller

These major elements will entail supporting equipments/systems such as:

• lubrication system;

• structural supports;

• electrical supplies;

• air supply and exhaust.

The diagram will show how all these elements are linked and how failure of any one element would affect the overall speed capability. Thus in a single screw ship the loss of the shaft will remove the mobility capability completely. In a multi-shaft ship the loss of one shaft only degrades the capability, and the degree of degradation can be assessed. The probability of loss, or degradation, of a capability can be calculated from the probabilities of failure of the individual components and how they interact with each other.

It must be remembered that To Float is one capability the ship must possess reflecting the facts that it must float at a reasonable draught and be stable. The external hull and internal watertight structure will contribute to this capability.

The dependency diagram can be a powerful design tool. Apart from availability which has already been touched upon they:

• Show how the design is configured to meet the requirements.

• Provide one way of breaking a design down into its constituent parts - systems, sub-systems and equipments.

• Enable costs to be allocated to capabilities so that the owner knows what each costs.

• Provide a framework for the tests and trials that will be needed to establish that the requirements have been met.

In using the diagrams in these ways it is important that the interfaces are clearly defined to ensure nothing is omitted or duplicated. Rules are needed on how those elements supporting more than one capability are to be dealt with. Going on one step they provide a vehicle for defining packages of responsibility that can be delegated to individuals in the design and construction teams. That is, they provide a useful management tool.

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