David, Another, more explicit, way is to imbed the twist and taper while creating the shape by using a General Blend. The wing example has been used in PTC training materials for years and can probably be found in the help files. The twist is achieved by specifying rotation around the Z-axis between sections. Taper can be achieved by retreiving the same section repeatedly, but specifying a changing scale each time it is used. You may need only two sections in your blend to achieve what you want. David
