Sorry for that, I think this guy asked me the same question and I created a video for him:
Yep, I misunderstood you, sorry. In general I like that people make a screencast, it's much easier to understand.
The airfoil sketch should be on the origin. This way it doesn't matter if you are using the cord line or the one of the origin axis.
If you could make a screencast and show me what you did, then it would much easier to help you.
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