Pilot Pete
A DME arc is designed for terrain clearance and traffic flow. Speed is generally irrelevant, unless there is a possibility of GPWS activation due to rate of closure to rising terrain beneath the arc.
Alteburger:
Winds aloft vs. ground track are irrelevant when flying a DME arc - the arc is to be flown within tolerances. Making allowances for wind to achieve this is part of pilot skills.
My $0.20 worth.
