More news of the future: " we are now able to project initial results of 16% fuel and emissions reductions, in line with our broader development roadmap. "
This after 7 years of “development”. After 7 years, they can only “project” meaningful results at some nebulous future point in time.
As someone whose first CAD drawing was a boat being pulled by a kite, I’m disappointed that it hasn’t worked out.
Below are two links provided by Dave Santos who would have the possibility to post himself with his own account.
September 4, 2025, by Naida Hakirevic Prevljak
Japanese shipping company Kawasaki Kisen Kaisha (K Line) has revealed that land tests verifying the performance of “Seawing” automated kite system utilizing wind power have been successful, paving the way for offshore demonstration tests in the near future.
The system is being developed by Oceanicwing, a subsidiary of K Line in France. To remind, back in February 2024, K Line acquired the French wind propulsion specialist Airseas which developed Seawing.
“K” LINE subsidiary tests 300 m² kite in first stage of “Seawing” development
The project is being carried out by OCEANICWING S.A.S., a France-based subsidiary of “K” LINE. In the first phase, concluded in June 2025, OCEANICWING tested a 300 m² kite at a land-based site to verify the tensile strength and performance of the system. According to the company, the results were positive.
Is a more detailed test 300 m² kite report available, including wind speed, force on the tether, and power?
Last news from Airseas, they have made some consecutive deployment and folding cycles. Not yet full launch and retrieval, but a good progress #maritimedecarbonization #windpropulsion #seawing #shippinginnovation #energytransition | Airseas | 10 comments
Since launch and land is automatic, perhaps they can consider the following options:
Install a second system at the rear of the container vessel. The two systems will probably not interfere with each other. (Double the savings?)
Increase the size of the kite.
Have a fleet of tow boats dedicated to AWE. These could be trimarans each with it’s own mast and kite. Each boat would be automatically steered and controlled so they do not interfere with each other.
Hi Pierre:
As a counterpoint, which I’m surprised you did not include, I’m cut-pasting from an email you sent me just days ago, about SeaWing testing showing no advantage, and failure to deliver any usefulness, below. I have trouble understanding the exact origin of the below passage, but the meaning is pretty clear. 
Doug:
Hi Doug,
I only became aware of Airseas’ failure with a wing of several hundred square meters in recent days through the article (see the attachment) attached by a commenter replying to second and fourth comments.
According to this article, a 500 m² kite was already tested in 2021, with a complete failure, with no reduction in fuel consumption, and high cost. According to a flight officer, a 20% reduction with the kite actually means a 4% reduction since the kite is only functional 20% of the time at best. He added that it never worked, knowing that the rule for sailing transport ships is 1 m² of sail per ton of displacement. Yet we have 500 m² for 12,000 tons. It is not sufficient.
Of course our AWE players would tell that in crosswind flight, it would be better (in fact much less than they think). But eights are only possible with a tailwind. And with a crosswind, the kite remains relatively stationary like a sail fixed on a mast.
I put the attachment (article from “Le Canard enchaîné” in French) again. The post from Airseas: Post | LinkedIn
The two comments, the second comments with the attchment:
OK This is Doug again: I will add that a kite flying figure-8’s, pulling directly downwind, is restricted to a very low relative windspeed, since the ship’s speed must be subtracted from the wind speed to give you the relative windspeed experienced by the kite, which would therefore be extremely low, which is why we’ve heard an explanation that the ship must travel slower than optimal speed, for the kite to be able to “help” reduce fuel consumption. But just slowing the ship alone reduces fuel consumption, while also lowering profit and prompt delivery.
I was not working anymore with Airseas when full scale tests at sea were performed, but I assume most of what the Canard enchainé said is true. I might disagree with the 4% number as the 20% reduction should already account for different weather conditions, but it probably corresponds to the current flight envelop and previous set up with still reduced kite size. The rule of 1m² of sail per ton is a non-sense coming from a certain range of size of old commercial sailing ships. I have sailed kiteboats quite a lot, and can tell you that there is no rule saying you can not do figure of eight by beam wind, in all depends on kite lift to drag ratio and added drag while turning (depends on line length), and ship hull/engine efficiency.
All sailors now that if you want to create wind while going downwind, you just have not to go dead downwind, not a real issue if your kite is providing significant part of your thrust.