Hi,
What model tests are usually included in the building specifications?
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Normally, the following model tests are included on the building specification:
- Resistance tests at design, ballast and scantling draughts,
- Self-propulsion tests at design, ballast and scantling draughts,
- Propeller open water test for designed propeller,
- Wake measurements at design and ballast draughts,
- Cavitation tests,
- Streamline paint test at design draught.
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Further to @George.Liadis response I would also add the following model tests that are not very common but can be requested and performed at an extra cost:
- Trim optimization tests
- Seakeeping tests
- Wind tunnel tests for the vessel’s superstructure
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An additional model test could be the so called mock up test of the anchor.
The foward part of the ship is built in scale in order to examine any interference with the lower part of the bow, proper distance from sideshell, proper lowering or heaving (without twisting) and storage position at the bolster.
Below extract from the excellent guide of Intertanko - “Anchoring Guidelines, a risk based approach”.
“Anchoring mock-up tests at Yard:
The flukes of the anchor should firmly attach the bolster at a minimum of two points. This will prevent the anchor from moving. The correct position of the anchor during heaving and stowing is essential as well. The two aforementioned conditions should be verified during the design stage and the performance of a mock-up test will assist to verify a well-operating design. Recommendation: The mock-up test should be carried out before the approval of “Arrangement of Anchor Handling” drawing. The presence of a buyer representative during the mock-up test may be substituted by a video showing the results of such a test.”
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What if a ship has bow thrusters? Does she needs extra tests?