If I suggested that the cross-product of a vector tangent to the edge of the
strake and one on the surface will be a normal to the strake at the point of
tangency, and that the cross-product of the two normals will give the angle
between them, would it help? (Half that angle is the bevel unless you
intend to shape the seam for later caulking.)

Roger

http://home.insightbb.com/~derbyrm

wrote in message
ups.com...

The current problem is how to work out bevels for both the ribs and the
strakes. Is there a formula for this? Ideally the more general the
solution the better e.g. would work for a scale model as well as the
full size.