The characteristics desired by the shipping company can usually be achievedwith various combinations of dimensions. This choice allows an economic optimum to be obtained whilst meeting company requirements.
1. Spatial requirements.
2. Stability.
3. Statutory freeboard.
4. Reserve buoyancy, if stipulated.
An iterative procedure is needed when determining the main dimensions and ratios. The following sequence is appropriate for cargo ships:
1. Estimate the weight of the loaded ship. The first approximation to the weight for cargo ships uses a typical deadweight:displacement ratio for the ship type and size.
2. Choose the length between perpendiculars
3. Establish the block coefficient.
4. Determine the width, draught, and depth collectively.
The criteria for selecting the main dimensions are dealt with extensively insubsequent chapters. At this stage, only the principal factors influencing these dimensions will be given.
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Prmetric
- Practical Design of Ships & Other Floating Structures
- Ship Design for Efficiency and Economy
- Sipstab
Main dimensions and main ratios
The main dimensions decide many of the ship’s characteristics, e.g. stability, hold capacity, power requirements, and even economic efficiency. Therefore determining the main dimensions and ratios forms a particularly important
