Hi Morten,
If I understand your question correctly, then neither of those 2d Helix are actually tangent. The more turns you have, then the more it will appear to be tangent, but no tangency is made due to the way the 2d Helix moves in/out from the actual circle.
To help show that. I have drawn 2 circles and placed an Helix, the first with 3 turns, the second with one turn.
The circles are in blue. The Helix in black. The green lines are tangent to the circle at the intersection of the circle/helix. The red lines are tangent to the helix at that same intersection.
- Steve
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