Hi All,

I have two splines that define cross sections of a body at different planes (like the lines drawings of yacht or airplane). Each of the two splines define a shape that are approximately elliptic (actually its a conic). The two splines are approximately concentric (i.e. one is inside the other and they don't overlap).

On the inner spline I have drawn a tangent to the spline at some arbitrary point.

The problem I am trying to solve is how to find the point at which a second tangent intersects the outer spline when the second tangent is parallel to the first on the inner spline.

Anyone got any ideas ??

Thanks,

Steve snipped-for-privacy@yahoo.com Remove the HATESPAM to email direct ...

PS: I can send the ACAD file to anyone who needs it to visualise the problem.