Directive of the European Parliament and of the Council of 12 December 2006 laying down technical requirements for inland waterway vessels and repealing Council Directive 82/714/EEC (2006/87/EC) (repealed)

Article 15a.03 Stability requirements for vessels under sail

1. For the calculation of the heeling moment according to Article 15.03(3), the furled sails shall be taken into account when determining the centre of gravity of the vessel.

2. Taking into consideration all load conditions according to Article 15.03(2), and using a standard arrangement of sails, the heeling moment caused by wind pressure shall not be so high as to exceed a heeling angle of 20°. At the same time

(a) a constant wind pressure of 0,07 kN/m² shall be applied for the calculation,

(b) the residual safety clearance shall be at least 100 mm, and

(c) the residual freeboard shall not be negative.

3. The righting lever of static stability shall

(a) reach its maximum value at a heeling angle of 25° or over,

(b) amount to at least 200 mm at a heeling angle of 30° or over,

(c) be positive at a heeling angle of up to 60°.

4. The area under the righting lever curve shall not be less than

(a) 0,055 mrad up to 30°;

(b) 0,09 mrad up to 40° or at the angle at which an unprotected opening reaches the water surface and which is less than 40°.

Between

(c) 30° and 40°, or

(d) 30° and the angle at which an unprotected opening reaches the water surface and which is less than 40°,

this area shall not be less than 0,03 mrad.