ISO/DIS 12217-1 Small craft ? Stability and buoyancy(8)

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known loading condition, enable all the intact stability parameters to be calculated.
NOTE 2 For a full description of how to conduct an inclining experiment, standard naval architecture textbooks should be
consulted (e.g. Principles of Naval Architecture, published by S.N.A.M.E) or refer to American Society for Testing and Materials
Standard Guide for Conducting a Stability Test (ASTM F-1321-90).
3.5.7
loaded waterline
waterline of the boat when upright at loaded displacement mass and design trim
3.5.8
righting moment
RM
at a specific heel angle in calm water, the restoring moment generated by the transverse offset of the centre of
gravity of the boat from the centre of buoyancy of the submerged part of the hull
NOTE 1 The righting moment varies with heel angle and is usually plotted graphically against heel angle. Righting moments
are most accurately derived by computer from a knowledge of the hull shape and the location of the centre of gravity. Other
more approximate methods are also available. The righting moment varies substantially with hull form, centre of gravity position,
boat mass and trim attitude.
NOTE 2 Righting moment is expressed in newton metres.
ISO/FDIS 12217-1:2001(E)
8 © ISO 2001 – All rights reserved
3.5.9
righting lever
GZ
the distance in both the horizontal and transverse planes between the centre of buoyancy and the centre of gravity
NOTE Righting lever is equal to the righting moment divided by the product of mass, in kilograms, and acceleration due to
gravity (9,806 m/s2) and is expressed in metres.
3.5.10
watertightness degree
degree of watertightness as specified in ISO 11812 and ISO 12216
NOTE The degree of watertightness is summarized as follows.
Degree 1: Degree of tightness providing protection against effects of continuous immersion in water.
Degree 2: Degree of tightness providing protection against effects of temporary immersion in water.
Degree 3: Degree of tightness providing protection against splashing water.
Degree 4: Degree of tightness providing protection against water drops falling at an angle of up to 15° from the vertical.
4 Symbols
For the purposes this part of ISO 12217, the symbols and associated units in Table 1 apply.
5 Procedure
5.1 Maximum total load
Decide on the crew limit and the maximum total load that the boat is intended to carry in accordance with the
definitions. The crew limit shall not exceed that determined by the seating or standing space requirements of
ISO 14946.
It is important to ensure that the maximum total load is not underestimated.
5.2 Sailing or non-sailing
Confirm that the boat is defined as non-sailing. Non-sailing boats are those where AS < 0,07 (mLDC)2/3.
Other boats are sailing boats and should be assessed using ISO 12217-2.
5.3 Tests and calculations to be applied
Non-sailing boats shall comply with all the requirements of any one of six options according to amount of flotation
and decking, and whether the boat is fitted with suitable recesses. These options and the tests to be applied (as

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