Leopard Catamarans 40 - 2-7.5 General Definitions

40 | 2-7 LoadCalculations
2-7.5 General Denitions
AboatgivendesigncategoryAisconsideredtobedesignedtooperateinwindsof
Beaufortforce10orlessandtheassociatedwaveheights,andtosurviveinmore
severeconditions.Suchconditionsmaybeencounteredonextendedvoyages,for
exampleacrossoceans,orinshorewhenunshelteredfromthewindandwavesfor
severalhundrednauticalmiles.Windsareassumedtogustto28m/s.
AboatgivendesigncategoryBisconsideredtobedesignedforwavesofupto4m
signicantheightandawindofBeaufortforce8orless.Suchconditionsmaybe
encounteredonoffshorevoyagesofsufcientlengthoroncoastswheresheltermay
notalwaysbeimmediatelyavailable.Suchconditionsmayalsobeexperiencedon
inlandseasofsufcientsizeforthewaveheighttobegenerated.Windsareassumedto
gustto21m/s.
AboatgivendesigncategoryCisconsideredtobedesignedforwavesofupto2m
signicantheightandatypicalsteadywindforceofBeaufortforce6orless.Such
conditionsmaybeencounteredonexposedinlandwaters,inestuaries,andincoastal
watersinmoderateweatherconditions.Windsareassumedtogustto17m/s.
AboatgivendesigncategoryDisconsideredtobedesignedforwavesofupto0,3m
signicantheightandoccasionalwavesof0,5mheightandatypicalsteadywindforce
ofBeaufortforce4orless.Suchconditionsmaybeencounteredonshelteredinland
waters,andincoastalwatersinneweather.Windsareassumedtogustto13m/s.
Summary of design category conditions
Design Category A B C D
Waveheightupto 7msignicant 4msignicant 2msignicant 0.3msignicant
TypicalBeaufortwind
force
upto10 upto8 upto6 upto4
Calculationwindspeed
(m/s)
28 21 17 13
NotethesedenitionsaredirectlyextractedfromISO12217&ISO10240
WARNING
The signicant wave height is the mean height of the highest one-third of the waves,
which approximately corresponds to the wave height estimated by an experienced
observer. Some waves will be double this height.