Hello, In the rule 2012, I note that the design area factor (Fd) is not linked with the ratio Ad/Ar, but on the stiffener space for the craft <...
Hello, Do you know why the calculation of Kar is not the same for sailing craft and planing craft ? The Kar of a planing craft vary with the...
Hello, In ABS HSC rule, the Fd (Design area factor) is given by a diagram ; do you know the mathematic formula used for calculating the Fd ?...
Hello, I don't understand the formula used by ISO 12215-5 for calculate the minimum moment of inertia for a GRP stiffener. In DIS 2004, the...
Hello, Can I submit you an example of calculation for a transverse frame for a sailboat with ISO 12215-5 ? The boat had a Lwl of 9 m and a...
Hello, I had interested by the first "vane gears" with trim tab. I had some informations about the vane gear of Buttercup, designed by...
Good evening, I have searched without success on Internet the original texts of the famous papers of Heller & Jasper (1960) and Allen & Jones...
Hello, I have some problems for calculating the maximum bottom pressure of a planning craft, for UNITAS and BV rules (I assume Kl and Kar = 1)....
Hello, In the book of Larsson and Eliasson (Principles of yacht design), I find an example of keel calculation (90° heeled and grounding, i.e....
Hello, You know the classic formula : SM = (C b l² P) / admissible stress In ABS and ISO rules, C is always 83.33 (end fully fixed). But...
Good Morning, I had problems for understanding the principle of floor calculation in load case 4 (cf ISO 12215 part 9 annex C). If you take...
Hello, I have a little problem for the definition of "unsupported span" for a transverse frame. On a sailboat (ABS ORY and ISO are agree !),...
Good evening, I frequently ask you about the method of calculation the scantling of ABS ORY and ISO. It seems to me, now, that : - the...
Hello, I have few questions about the calculation of tranverse frame when I use ABS ORY or ISO rules. 1) How calculate the pressure (before...
Hello, I find a formula in the ABS ORY rules for calculate the thickness of a carvel planking : is this formula valuable also for the...
Some questions for Paul Kotzebue re: K-5m and K-28 Good Evening, I had visited with much interest your website ; can I ask you some precisions...
Hello, The ISO or ABS ORY don't impose a maximum space between longitudinal or transverse frame : if you choose a great spacing, you must...
Hello, I need help for interpreting the calculation of SM floor with ABS ORY rules. If I see the figure 8-2 and assume that the length of...
Hello, After the reading of the thread "Scantling rules" (february 2010), I have a little (and maybe idiot) question : what are the "first...
Hello, I have a little question about the calculation of a transverse frame for a sailboat. I know the equation SM = (83.33 b l²...