The offsets table in your picture seems totally normal, with something that, indeed, would have to be interpreted, for example, section called "T". Could you show us some example of the table of offsets that you usually use?.
The offset table in post #5 shows a very small frame distance, maybe one inch or so. So you can create a curved line which simply consists of small pices of straight lines. If I understand this right: is the much larger distance in the offset table (6' 6", post #1) the problem? (If you put the 6 feet long pieces of straight lines together, it will produce a broken line, not a fair line.)
No my problem is I am trying to make text files from offsets for importing into my CAD program and don't understand how to read the offset table the way they have it set up compared to the one above for the Fletcher where it is laid out easy for me to understand. I am new to all this boat stuff so
trying to learn how they have the different styles set up
The sketch below shows a boat placed in an cartesian coordinante system.
The system defines three principal planes: the x-y plane (base plane, horizontally, parallel to the construction/design waterline), the x-z plane (center plane = plane of symmetry, vertically) and the y-z plane (vertically, all frames or stations are located in planes parallel to the y-z plane).
Each offset value is the distance between one of the principal planes and the particular point of the hull (allways measured perpendicular to the reference plane).
The drawing of the BCMBoat tells you that the waterline No 3 B is in a plane 3' above the base plane (z = 36") and parallel to it. And the value of half bread at station 2 is "1 - 3 - 4" so y = 15.5". Station 2 is located 2 times 6'-6" from y, z plane so x = 156" .
The buttocks are located in planes parallel to the center plane and the drawing says with a distance of 2', 4' and 6'.
The rabbet is the line along the keel where the bottom planks join the keel.
so are you saying that the waterline height of 3A 4 and 5A has the same 1' spacing as the lower waterlines?
ok I just got off work so going to try and redraw my excel file and change all the data locations around to match the way I am used to seeing on the Fletcher drawings and see if it makes more sense to me. I really appreciate you guys help and patience I just want to be sure I understand everything so that the next time I can do it without any problems. hehe wished it was as plain and simple as the fletcher layout
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