SECTION 1 - Boat Design Net

Pt B, Ch 7, Sec 1Figure 2 : Vertical distance z for monohullCalculation pointzp bottomp s = p bottom - zzp bottomp s = p bottom - zFigure 3 : Vertical distance z for catamaransCalculationpointz2.2 Sea pressureB Wl/ 2Base line2.2.1 For all types of yachts, the sea pressure in any point ofthe bottom and side shell, in kN/m 2 , is defined by the followingformula:P SC WX I= 9,807n T + ⎛------ + h ⎞⎝2 – z⎠where:n : Coefficient depending on the navigation notation,as given in Pt B, Ch 4, Sec 2T : Full load draught, in mC W : Wave height, defined in [1.1.3], in mX I : Wave load coefficient shown on Fig 4, anddefined in Tab 1z : Vertical distance from calculation point to thefull load waterline (monohull) or to the baseline (catamarans). For monohull, bottom pressureis calculated with z = 0h 2 : Distance in m, equal to:• for monohull: h 2 = 0• for bottom or external side shell of catamarans:h 2 = 0• for internal side shell of catamaran andinner side of cross deck of catamaran:B ⎛W T C W+ ------ ⎞ CB⎝ X I⎠h 2 = -------------------------------------lwhere:B W : Breadth at full load waterline atconsidered transverse section(see Fig 3)l : Distance between internal sideshells at waterline at consideredtransverse section, in m, asdefined in Fig 3C B : Block coefficient defined in Ch 1,Sec 2, [2.1.1].Type of yachtsTable 1 : Wave load coefficientsArea 4 (1)Area 3 (1)Area 2 (1)Area 1 (1)X 4 X 3 X 2 X 1Monohull motor yacht 2,8 2,2 1,9 1,7Monohull sailing yacht 2,2 1,9 1,7 1,4Multihull motor yacht 2,8 2,2 1,9 1,4Multihull sailing yacht 2,5 2,2 1,7 1,1(1) See Fig 4 for definition of areas.134 Bureau Veritas Rules for Yachts July 2006 with February 2008 Amendments