5.3.1 General
The test programme should be witnessed by a Contracting Government to the Convention (whenever known, this should be the Administration), surveyors nominated by them for the purpose or organizations recognized by them.
The following test programme should be conducted for each operating mode (i.e. displacement and non-displacement) and for each of the significant wave heights stipulated in 3.1 above.
Either of two approaches may be adopted to the test programme:
.1 direct physical testing on five headings relative to the wave direction, with 450 increments in heading, or seven headings relative to the wave direction, with 300 increments in heading; or
.2 direct physical testing at speed in head and following seas, and stationary in beam and bow and stern quartering seas, complemented by numerical simulations on five headings relative to the wave direction, with 450 increments in heading.
Where the latter approach is adopted, the numerical simulations should predict accumulated volumes of water at least 10% more than those determined from the equivalent physical model test cases.
5.3.2 Duration and repetition of test runs
Each tank run should be of the maximum practical duration, in any case not less than the equivalent of one minute at full scale. Each test case should comprise sufficient tank runs to represent not less than ten minutes of full scale operation, the bow opening shutter being opened and closed at the beginning and end of the test period of each run, in order that the maximum opportunity is given to establish a steady state volume of water on the vehicle deck(s).
Tank runs for each test case should be conducted in at least three separate wave realisation trains in head and bow quartering seas, four in beam seas and five separate wave realisation trains in following and stern quartering seas, each such train being taken from the required wave spectrum.
Numerical simulations should replicate the equivalent of the required physical test cases, and in addition model the roll decrement tests (both stationary and at speed) for verification against the model tests.
5.3.3 Head seas
As a minimum the following tests should be conducted:
.1 at a speed of approximately 65% of V W and nominal LCG, tests in waves with three spectral peak periods to determine which period is the most critical;
.2 at a speed of approximately 65% of V W and in the most critical wave spectrum, tests at the forward and aft LCGs to determine which is most critical;
.3 at the most critical LCG, tests at progressively increasing speed up to but not exceeding V W ; and
.4 tests in .3 to be repeated at the minimum operating weight.
5.3.4 Following seas
As a minimum the following tests should be conducted:
.1 at a speed of approximately V W and nominal LCG, tests in waves with three spectral peak periods to determine which period is the most critical;
.2 at a speed of V W and in the most critical wave spectrum, tests at the forward and aft LCGs to determine which is most critical;
.3 at the most critical LCG, tests at progressively decreasing speed down to but not less than 65% of V W ; and
.4 tests in .3 to be repeated at the minimum operating weight.
5.3.5 Other headings
Tests at other headings should be conducted similar to those described above except that:
.1 bow quartering sea tests according to 5.3.3.3 and 5.3.3.4 above should use the wave period and LCG deduced from 5.3.3.1 and 5.3.3.2;
.2 stern quartering sea tests according to 5.3.4.3 and 5.3.4.4 above should use the wave period and LCG deduced from 5.3.4.1 and 5.3.4.2; and
.3 beam sea tests according to 5.3.3.3 and 5.3.3.4 above should use an intermediate wave period and LCG deduced from 5.3.3.1 and 5.3.3.2 and 5.3.4.1 and 5.3.4.2.