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Pioneering wind-powered cargo ship sets sail
(www.bbc.co.uk)
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this post was submitted on 21 Aug 2023
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Okay, some explanation, this is not exclusively wind powered but wind assisted. Sail is meant to aid in reducing fuel consumption. Design of the sail, which is what most people are finding odd, is as such to require very little management, since it's using Mesner effect it only requires adjusting speed and direction of rotation. At the same time design is such as to not hinder loading and unloading process. Also claimed 30% is grossly exaggerated.
Why hasn't this caught on yet you might ask? Well ship owners don't give a shit. Simple. The cost of fuel is calculated in transport cost and since no one else is doing it, why would anyone do it. Cargo ships have multiple fuel tanks and they will burn pretty clean fuel while they are in controlled areas (EU/USA). The moment they leave those areas they burn the dirtiest and also the cheapest fuel possible. Why wouldn't they when their engine's piston is so big human can lie in it. I mean just look at the crankshaft
So all in all, this could have been done ages ago. The sail is called Flettner rotor and has been invented in 1920s. Image on site shows a bit different design, but probably based on same physics just slightly more optimized. The reason why it wasn't done ages ago... well, simply fuel was too cheap and paid for by another.