Comment by rob74
5 hours ago
If you had bothered to at least skim TFA, this is addressed in the third paragraph:
> The idea is not to turn modern cargo ships back into sailing vessels. Instead, these systems are designed to work alongside conventional engines, using the wind to reduce fuel consumption whenever conditions allow.
News articles to this effect have been popping up occasionally for the past 20 years at least. So the economics don't seem to stack up. At least not yet; but if oil gets a bit dearer...