3.5 Results of Drifting Tests
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1227 – Explanatory Notes to the Interim Guidelines for Alternative Assessment of the Weather Criterion – (11 January 2007) - Annex - Explanatory Notes to the Interim Guidelines for Alternative Assessment of the Weather Criterion - 3The determination of the wind heeling lever lw1 - 3.5Results of Drifting Tests

3.5 Results of Drifting Tests

  3.5.1 In the same manner as equation (N-3.6), the measured heeling moment generated by the drift motion, Mwater , was converted into the height of the centre of drift force above waterline, lwater . The values normalized by the draft are shown in figure 3.6, where the angle of heel is positive when the ship heels to the drift direction as shown in figure 3.3.

  3.5.2 It can be observed that, in the examined case, the centre of drifting force is above half draft (which is the assumption in the standard criterion) and is generally above the waterline. This phenomenon appears when breadth/draft ratio is large, due to the pressure distribution on the bottom.

Height of the centre of drift force for assumed wind drag coefficients

Parent topic: 3 The determination of the wind heeling lever lw1
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