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@gcvsa @kludgekml @hart
My dude, the technology already exists *and is in use* in contrast to your belief, so do ships that run on a mix of wind, electricity and renewable fluids for classical motors when the wind is too low even for those modern sails. It's just not wanted for economical reasons.

Flettner rotor:
https://en.m.wikipedia.org/wiki/Rotor_ship

Purely electric:
https://www.theguardian.com/australia-news/2025/may/02/hull-096-worlds-largest-electric-ship-battery-power-launched

Combustion (Synth. Methanol):
https://www.hellenicshippingnews.com/the-worlds-largest-methanol-powered-container-ship-now-in-regular-service-between-the-port-of-gothenburg-and-asia/

Proof of cargoship with sails:
https://edition.cnn.com/2023/08/22/travel/wind-powered-cargo-ship-cargill-bartech-climate-c2e-spc-intl