Sail ships

Modern version of sail ships:


The “SOHAR MAX” – with a carrying capacity of 400,000 tons – is equipped with five giant rotor sails, each 35 meters tall and 5 meters in diameter, developed in collaboration with global leader Vale and Anemoi Marine Technologies.
Source: Oman's Asyad Group introduces wind-powered mega vessel - Offshore Energy

From LR last year - good report, mostly.
Wind-Assisted Propulsion for ships | LR


Image Caption: TR Lady with three 5x24m Anemoi Rotor Sails credit:ANEMOI

I wonder if it slowed down the roll period in ballast.

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Good question, I would think it MAY do as it adds weight high up, but not sure how much weight.

Good day.

below screens explain .

The answer is : it will .

And the answer stems from formula marked in red and inverse relation btw T and square root of GM.

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Yes it will, but how much depends on the KG and weight of the rotor sails.
I have NOT seen any weight figures, but assume it varies for each type?
PS> There will also be a heeling factor, depending on wind force and relative direction. (probably not much on a ship of that size, though)

Here is a REAL sail ship:


The ALEXANDER VON HUMBOLDT II navigating the Dutch coastal waters
Photo : Flying Focus Aerial Photography www.flyingfocus.nl ©

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I’ve raced against the original and her distinctive green hull and sails.

Just interesting to note the unusual fatter mizzenmast from which I assume engine exhausts from the masthead.

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The Norwegian SORLANDET is participating in the 2025 Tall Ships Races.
Spotted in the photo at the Wandelaar pilot station off the Belgian coast.
Photo: Ronald Ribbe – http://www.rorifocus.nl ©

Photo of ships in Newcastle NSW in 1906:

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Photo: Leo Boersen (c)


The vessel received quite the welcome. Photo: Robin Utrecht

Here is a chance to get your very own “party ship”:


“Lady Mack” in front of the opera in Oslo. Now it can be cut up. Photo: Skippern Yachts

“Lady Mack” at sunrise Photo: Skippern Yachts

Source: https://www.kystens.no/nyheter/en-av-norges-storste-fullriggere-kan-bli-pinneved/2-1-1859020

Broker’s specs: SS Lady Mack – Skippern Yachts

Back to modern “wind assisted ships”:

First installation is planned on a 7100 PCU PCTC in 2025:


https://www.partyard.eu/oceanbird-unveils-boldly-finalized-design-for-worlds-first-wind-powered-roro-vessel/

Construction and assembly of the masts and sails are under way in Sweden:

As is the “sails”:

A new CEO is also joining Oceanbird:


PS> Familiar background. She now lives on my home island of Hessa and work for VARD in Ålesund.

Sad story:

In the discussion on Nuclear powered ship the question of how moder wind assisted ships handle headwind came up. Nuclear powered ships? - #206 by Jughead

Bringing the discussion to this thread, where it belongs.
There are several types of modern wind assisted propulsion available and in use and new solutions are under development.

Here is a comparison by Kongsberg of the different types presently available:

(Date of issue is not stated)

PS> The purpose of all is to reduces fuel consumption, thus GHG emission and to save money.

Further to the discussion in the other thread:

Here is one that will use only wind power on the Atlantic crossings:

Assuming that these vessels will have refrigerated and temperature/humidity controlled cargo spaces, they will need some form of power supply for the crossings and for propulsion to manoeuvre in and out of ports etc.

PS> Nothing said about the source of such power, nor about what these ships will carry on the return voyage (if anything).

The quote that a container vessel will use 19% less fuel on a Transatlantic voyage will be nullified by the loss of cargo capacity. For smaller vessels I see methanol or similar being the only alternative. For the 24,000 TEU it has to be nuclear.

The first shipment of frozen meat from New Zealand to Britain was under sail in the 1882 in the 3 mast barque DUNEDIN. She loaded 300 tonnes of coal for the refrigeration plant to keep the 11,000 carcasses frozen. The voyage took over 90 days .

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Here is real sail ship on a world tour.
Statsraad Lehmkuhl in the Gatun locks:

More from her Panama Canal passage and world tour:

Another real sail ship is also on a voyage for One World: