pb with GORDON surfaces

 From:  Marc (TELLIER)
1191.16 In reply to 1191.15 
Hi lorem, you must already know this but it is relatively easy to make curves tangent with control points, you just align them in a perpendicular way. (see attached)

If your object is not perpendicular to a plane it gets trickier, but building reference geometry with object snap works well in this situation.