Sheer plan

The sheer plan, or profile plan, is the side-elevation view of the lines drawing, showing the buttock lines, the curves where vertical fore-and-aft planes parallel to the centerline cut the hull, projected onto the centerplane. It also carries the profile of the stem, keel, and stern and the sheer line of the deck at side. Each buttock is the intersection of the hull with a plane at a fixed half-breadth from the centerline, so the centerline buttock traces the keel-to-stem-to-stern profile. It is one of the three consistent views of the lines plan, with the half-breadth plan and the body plan. Note the dual use of sheer: the view, and the fore-and-aft sweep of the deck line shown within it.