a ski boat
A planning hull is a hull of a boat that has its weight supported more by hydrodynamic lift, rather than hydrostatic lift or buoyancy.These boats are built for speed.
The hull on a boat is the body of it. It is watertight so that no water leaks in and sinks the boat.
A planning hull is a type of boat hull designed to lift the vessel out of the water at high speeds, reducing drag and improving efficiency. This design typically features a flatter bottom and sharper entry angles, allowing the boat to "plane" on the surface rather than plowing through the water. Planning hulls are commonly found in powerboats and performance vessels, enabling them to achieve higher speeds compared to traditional displacement hulls.
Planning hull
On the hull
Displacement: The weight of the water the boat displaces. Hull weight: The weight of the hull of the boat
the hull helps keep the boat stable, if there was no hull, the boat would go in different directions
You may mean a planing hull. That is a shape of boat hull that "planes" or rides on the top of the water at high speed, rather than plowing its way through the water.
A hull is the watertight body of a ship or boat. Above the hull is the superstructure and/or deckhouse, where present. The line where the hull meets the water surface is called the waterline.
The hull of a boat is the main body that rides in the water. Engines, Decks, masts and rudders are all installed in or on the hull.
Basically, the hull on a boat keeps out the water, and displaces the water to create buoyancy, which enables the boat to float.