Waterline
Videos
The waterline is the line where the hull of a ship meets the surface of the water.
Waterline of a ship. The mark above the waterline indicates the Plimsoll line
Sailing
Videos
Sailing employs the wind—acting on sails, wing sails or kites—to propel a craft on the surface of the water, on ice or on land over a chosen course, which is often part of a larger plan of navigation.
Waterline
…order to safely maintain buoyancy. For vessels with displacement hulls, the hull speed is defined by, among other things, the waterline length. In a sailing boat, the waterline length can change significantly as the boat heels, and can dynamically affect the speed of the boat. Per the US Air Force Airframe…
Sloops racing with fore-and-aft sails
Three-masted barque with square sails
Sailing hydrofoil catamaran with wingsail
DN class ice boat