Information on current practice, and a proposal on how to
correct the original GMmin curve for use on board every ro-ro passenger
ship covered by SOLAS regulation II-1/8.9 adopted by resolution MSC.26(60), during the transitional
period for all ships, and thereafter having A/Amax≥
0.95 is provided hereunder.
1 Where the GMmin value for A/A max is
greater than that in the original GMmin limit curve according to the
1974 SOLAS Convention, the limit curve should be adjusted by linear
interpolation between the GMmin value for A/Amax at the
maximum draught, and the value in the original SOLAS 74 limit curve
at the draught given by the following formula:
where:
|
d
LS
|
= |
is the
lightship draught; and |
|
d
S
|
= |
is the
maximum subdivision draught. |
2 Direct calculations can also be used as an alternative
to 1 above, according to the following guidelines:
-
.1 An additional curve (GM as a function of draught)
could be assessed for constant A/Amax over the range of
draughts.
-
The value of A/Amax may be taken as the lower
limit of the range of A/Amax defined in SOLAS regulation II-1/8.9 (for instance, for an original
A/A max= 0.87, a value of 0.85 may be taken).
-
.2 The new GMmin limit curve should be the greater
of either the original SOLAS 74 curve or the additional curve as specified
in .1 above.