Section 2 Direct calculations

2.1.1 Where the designer intends to submit direct calculations, it is the responsibility of the designer to ensure at an early stage that the proposed method and calculations are acceptable to LR. The case for direct calculations is to be supported by the following:

• goal of the requirement;
• reference(s) to published work supporting the proposed method; and
• acceptance criteria.

2.1.2 Direct calculations using hydrodynamic computer programs may be specifically required by the Rules. Also they may be required for craft having novel design features, or may be submitted in support of alternative load and design criteria. LR may, when requested, undertake calculations on behalf of designers and make recommendations in regard to suitability of any required model tests.

2.2.1 In cases where direct calculations have been carried out, the following supporting information is to be submitted as applicable:

1. Reference to the direct calculation procedure and technical program used.

2. Input data.

3. A description of the model.

4. A summary of analysis parameters including environmental conditions, speeds and headings.

5. Details of the weight distributions.

6. A comprehensive summary of calculation results. Sample calculations are to be submitted where appropriate.

2.2.2 In general, all input data and output results are required to be submitted. In such cases, magnetic media with agreed format may be used for submission.

2.2.3 The responsibility for error free specification and input of program data and the subsequent correct transposal of output rests with the designer/Builder.