Reading Boat Plan Offsets
Reading a boat plan can get pretty tricky. if you don't know what you are doing that is. but with boat plans, there are so many people out there that can help you it's not even funny.. Note that the section plan only shows half of the shape of the hull, one side of the plan shows the sections from the bow aft to the mid-section, the other side shows the sections from the stern forward to the midsection. the curves are symmetrical, so both sides of the section need not be shown.. The plan will show three views, a plan, a profile and a body plan which, is the view from bows on. heights are measured vertically off the base line, though sometimes from a datum waterline. the hull length will be divided vertically into 'stations', positioned in relation to the centreline..
Plan view - this is the view of the boat looking down from the sky. traditionally the plan view has two halves. on one side you will see the lines of the boat. the lines in this view are the waterlines, the sheer, the centerline and the frame spacing if there is one. on the other side of the plans view you will see what is basically a sketch of. The table of offsets is used to 'loft' - draw the plans fullsize on the loft floor. it's a complicated process, and you'd need a book on "lofting", which you can find at marine bookstores or at woodenboat. but realistically, since the book also includes the plans for the sea witch, you don't really need the table of offsets. work from the plans.. The aspect of constructing a boat which seems to be most terrifying to the amateur builder (and sometimes the professional builder tooling up for grp volume production) is the lofting of the lines..