The keel issue, at least, can be solved by using a kite instead of a sail. There appears to be at least one company working on this: https://www.cnn.com/2023/0

The keel issue, at least, can be solved by using a kite instead of a sail. There appears to be at least one company working on this: https://www.cnn.com/2023/06/30/travel/airseas-giant-kites-ships-slash-carbon-emissions-scn-climate-spc/index.html https://www.cnn.com/2023/06/30/travel/airseas-giant-kites-sh...