> I recall reading that Jim Michalak uses the method of joining

> triangles.

It's all based on the concept that the ply doesn't stretch, so the

triangles all stay the same size and shape. Suppose you have a chine

hull drawn with the usual 11 stations (0-10). To lay out the

topsides, you could start with the triangle that has the base at the

chine and rail at station 5, and the peak at the rail on station 6.

The next triangle would have a base at the chine and rail at station

6 and the peak on the chine at station 5. Etc, both ways.

So far as I know, all the fancy software works basically the same

way, except they use a larger number of stations (and/or cleverly

chosen triangles) to cut down the error.

Exercise for the student: What happens when you try this process with

a "non-developable" hull shape? Hint: the trouble begins because the

straight-line length of a triangle side is not the same as the length

measured along the curve of the hull.

Peter