William Sutherland's concept of ship hull design, 1711

Being fresh from reading a very interesting publication on the Restoration yachts of Charles II, I looked again at William Sutherland's work, The Ship-builders Assistant, 1711, focusing on his method of shaping ship hulls. In his work, Sutherland proposes shaping ship hulls so that the submerged part of the hull takes the form of an (elongated) egg. Such a shape is called a conoid. Both the characteristic feature and result of such a form are frames with the profile of a perfect arc

In order to show something concrete again in this thread in as clear a graphical way as possible, and perhaps persuade Mark to design an Elizabethan era ship himself, I present below a relatively easy way to do it. It can be useful for graphical as well as non-graphical and partly graphical methods of ship design. Precisely, it is about achieving the most important and at the same time conceptually most difficult shape of the submerged part of the hull. This is one of the many variants of the mo