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Retractable Sail Could Give Bikes A Boost Of Wind Power
(newatlas.com)
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I think we would only be useful for a very straight ride; it's not like you can tack like a boat.
I guess theoretically it could work as long as you don't have a headwind either directly on you or within the 90 degree front peripheral, but then I'm applying sailing logic which probably doesn't work on the road