The angle numbers for a 1.6X length radius arc:
0, 3.5833, 7.1808, 10.8069, 14.4775, 18.21, 22.0243, 25.9445, 30.001 so that could be an extended straight line at the 60% station.
Delta's smoothly rise from 3.5833 to 3.8143 at 60%.
It looks like I'm getting 5.66X the height for the arc radius so that's pretty close agreement.
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