Would like to see more about what's going on below the waterline. The challenge with any form of wind power is that the propulsion doesn't typically point forwa

Would like to see more about what's going on below the waterline. The challenge with any form of wind power is that the propulsion doesn't typically point forward - it's at an angle with a forward component. So on a sailboat you need a long keel (or centerboard/daggerboard) to translate the lateral propulsion into forward movement. That constricts the vessel from operating in shallow waters and causes the vessel to lean due to the opposing force under the waterline.