42 © ISO 2001 – All rights reserved
ISO 12217-1 CALCULATION WORKSHEET No. 6a RESISTANCE TO WAVES+WIND
Input data: Design Categories A and B only
item symbol unit Cat. A Cat. B ref.
mass in minimum operating condition mMOC kg 3.4.7
loaded displacement mass mLDC kg 3.4.4
Is ratio of mLCC/mMOC > 1,15 ? YES / NO
NB: If YES, sheets 6a and 6b must be completed for both loading conditions. 6.3.1
displacement volume ( = mMOC or mLDC/1 025 ) VD m3 3.4.5
plan area of all recesses AR m2 6.3.1
plan area of all recesses forward of LH/2 ARF m2 6.3.1
windage area (of above water profile of boat) ALV m2 3.3.7
windage area to be used (not to be < 0,55LHBH) AL V m2 6.3.2
length waterline LWL m 3.3.2
draught at the midpoint of LWL TM m 6.3.2
downflooding angle D degrees 3.2.2
calculation wind speed vW m/s 28 21 3.5.1
Recess limitations:
item symbol value ref.
Ratio of recess area to length x beam AR/LHBH 6.3.1
Design category possible (A if < 0,2, B if < 0,3) 6.3.1
Ratio of forward recess area to length x beam ARF/LHBH 6.3.1
Design category possible (A if < 0,1, B if < 0,15) 6.3.1
(continued on Work sheet 6b)
ISO/FDIS 12217-1:2001(E)
© ISO 2001 – All rights reserved 43
ISO 12217-1 CALCULATION WORKSHEET No. 6b RESISTANCE TO WAVES+WIND
(continued)
Derived from the righting moment curve (see annex D):
Rolling in beam waves and wind:
item symbol unit Cat. A Cat. B ref.
angle of vanishing stability V degrees 3.3.8
least value of D, V, or 50 A2 degrees
wind heeling moment A A L T v 2 0,3 LV LV WLM W MW Nm 6.3.2
assumed roll angle Category A = (25 + 20/VD)
Category B = (20 + 20/VD)
R degrees 6.3.2
area A1 below MW from equilibrium to R A1 any Figure 5
area A2 above MW from equilibrium to A2 A2 any Figure 5
ratio of A2/A1 — 6.3.2
Is ratio of A2/A1 greater than or equal to 1,0? YES / NO 6.3.2
Resistance to waves:
item symbol unit Cat. A Cat. B ref
least value of D, V or 50° A2 degrees
heel angle when righting moment is maximum GZmax degrees
If GZmax is greater than or equal to 30°:
max. value of righting moment in range 30° to A2
RMmax Nm
required max. value of righting moment Nm 25 7 6.3.3 a)
Is RMmax greater than or equal to required max. value? PASS/FAIL 6.3.3 b)
max. value of righting lever = RMmax/(9,806 mLDC) GZmax m 3.5.9
required max. value of righting lever m 0,20 6.3.3 a)
Is GZmax greater than or equal to required max. value? PASS/FAIL 6.3.3 a)
If GZmax is less than 30°:
max. value of righting moment RMmax Nm 6.3.3 b)
required value of RMmax (A = 750/Gzmax, B = 210/Gzmax) Nm 6.3.3 b)
Is RMmax greater than or equal to required max. value? PASS/FAIL 6.3.3 b)
max. value of righting lever = RMmax/(9,806 mLDC) GZmax m 3.5.9
required max. value of righting lever = 6/GZmax m 6.3.3 b)
Is GZmax greater than or equal to required max value? PASS/FAIL 6.3.3 b)
Design Category given: NB: Boat must meet both recess limitations, have ratio of A2/A1
greater than or equal to 1,0, and also get PASS twice under resistance to waves.
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