John Holtrop wrote:
regarding the value of diagonals, they give the designer another set of
points, which are useful for evaluating the fairness of the hull,
particularly around the turn of the bilge.


See http://www.dixdesign.com/lofting1.htm about a third of the way down
the page (figure 1) for an example. The body plan (right side center)
shows where the diagonals are run, and the diagonals themselves are
shown below the waterlines. Generally, diagonals are positioned where
the curvature of the hull is significant (often in way of the turn of
the bilge). The additional offsets provide more definition where the
buttocks and waterlines do not provide enough points to clearly
determine hull shape. Note that the diagonals do not all have to have
the same origin (as the example shows).

dave

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