Comment by barbegal

The headline is misleading they haven't put anything on a cargo ship yet and likely never will. They have a single prototype yacht which can be seen in this image https://cdn.trendhunterstatic.com/phpthumbnails/454/454358/4...

It's an interesting concept but I can't really see how it scales to large ships. To propel a larger ship you need a huge amount of force which requires a very sturdy mast and stays (guys) which support the mast. Without those elements the amount of force that can be transmitted will be negligible.