Hullform Professional Editions - Fairing and Other Editing

The professional versions of Hullform permit up to 400 longitudinal lines, and 100 transverse sections, each located wherever you prefer. They may correspond to actual hull lines, like the sheerline, chines and keel, or to waterlines, diagonals or buttock lines.

Changes may be made graphically, using the cursor keys and the mouse, or by keyboard entry of numerical values.

You can let the program fair the hull lines automatically for you, or you can place each point where you want, retaining any steps you want and fairing only those parts you want to be fair.

From a technical point of view, the program uses natural cubic splines in fairing longitudinal lines. A fast, non-iterative algorithm makes the fairing process close to instantaneous on even the slowest computer.

Transverse section curves use a piecewise quadratic Bezier. Half of the defining points correspond to locations on the hull surface, the other half located in between, to define the section curvature. The hull surface may be maintained perfectly fair if required, or chines located at any defined lines.

There is very little restriction on the shape which can be handled by this model. Whether you are designing a hard-chine planing hull, round-chine dinghy or a large keel yacht, Hullform can fair it, analyse it and display its fine detail for you to inspect.

The graphic above shows the Hullform edit screen in a reduced-size window. This represents only one of a number editing techniques provided.