Rotating Sails Help to Revive Wind-Powered Shipping
Aren't kite systems much more efficient and lighter and cheaper?<p><a href="https://www.researchgate.net/figure/A-ship-sailing-with-the-assistance-of-a-kite-sail-Photo-Skysails_fig5_338901158" rel="nofollow">https://www.researchgate.net/figure/A-ship-sailing-with-the-...</a>