A couple years ago when I was doing the Venus-helicopter thing, a proposal came for an infinite solar-powered 'copter over Earth - which I missed. h/t ToughSF again since Nyrath seems on break lately. Claim: 20 m/s indefinitely (windspeed and sunlight permitting).
I'd add, the lifespan and relative-mass of the panel, permitting; and the gears spinning the blades, permitting. Although: we're doing better at panels. If we're talking Venus then windspeed is indeed an issue, but if we stay over the (acid) clouds we're in clover for sunlight.
BOOST 5/20: cyclocrane?
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