I have a wing which is driven by equations. You change the winghalfspan value (default is 800mm) in the equations txt file and voila the whole wing will grow or shrink in proportion in all parameters aside from skin thickness which is a constant of 5mm (foamboard)

I have made an extruded cut in the wing to leave space for an aileron and sketched (image one, pointed at with a red arrow) on the exposed face (image 1, shaded in blue) to do a lofted cut and give the edge a chamfer (image 2)

The problem is, whenever I enter a new winghalfspan value in the equations txt file, the wing grows in proportion but the sketches made on the face don't. They go into an error state and are no longer connected to the vertex of the wing like before. They keep jumping around. This does not happen with the other identical wing I made for the starboard side.

It's driving me absolutely crazy! If anyone can help, it would be greatly appreciated.

The part is included in the attachments as well as the equations file so you can have a play around and see what I mean.

Thank you

Matt