Wind-powered marine propulsion

[sicetaitsimple]

They hope for 30% savings, which gives us 865 t of "fuel saved" and 2700 t of CO2?

I do not think so. An article in English mentioned "up to 30%" (maximum of 30%), I tend to trust it more than a rough translation in French.
I interpret it as the instantaneous maximum fuel economy when the wind direction and speed are optimal relative to the ship's heading. Which is of course not always the case.
But I could be wrong.

[izentrop]

You're right, I thought about it afterwards.

[sicetaitsimple]

It becomes a little coherent again, at least on the CO2/fuel ratio. This would be 1,5t/d of fuel saved by "sail" or "wing".
“I predict that by 2025, half of new ships will be powered by wind. The reason I'm so confident is the savings: a ton and a half of fuel per day. If we put four wings on a ship, we save six tons of fuel and 20 tons of CO₂ per day. The numbers are enormous,” summarizes John Cooper, director of Bar Technologies at the BBC.
Well, we'll see, we can't blame the technology developer for being enthusiastic and confident!