Updated at: 24-09-2021 - By: Lucas

The ship hull is the strongest part of a ship. It protects the rest of the ship from damage. The five different types of ship hulls are made with steel, wood, fiberglass, plastic and other materials.

This is the most important part of the ship because it is here where the majority of the weight of the ship is located. Also, it is here that the strength and stability of the ship are located.

In this article, we are going to talk about the different kinds of ship hulls and their functions. We hope that after reading this, you will have a much better understanding of the ship hull.

Displacement Hulls

Displacement Hulls

A displacement hull is a boat design with a flat bottom and a rounded sides and top. Displacement hulls are usually less than 25 feet long and are designed for easy storage and transportation. A displacement hull is simply a hollowed-out section of a larger boat. When you put water in the hollowed-out section, it becomes a full-sized boat. Conversely, when you take water out of the hollowed-out section, it reverts to being a storage container.

Displacement hulls are extremely common and can be found in a variety of shapes and sizes. The most common types are the center console, the hard-sided box, and the soft-sided duffel bag. 

Center consoles are the most versatile and can be used as either a center console or a galley-style countertop. Hard-sided boxes are great for shipping and storing large amounts of gear. And, soft-sided duffel bags are handy for transporting camping equipment and other items that don’t need to be tied down.

Planing Hulls

A planing hull is a boat hull design that enables the boat to plane over waves rather than be bounced around like a ping pong ball. This hull design was developed in the 1930’s by a man named Eugene Sperry who was the head of a company called the Sperry Corporation.

The original planing hull boat was designed for speed and efficiency. It had a flat bottom with a high, thin, V-shaped bow. The idea was to use the flat bottom to plane over the surface of the water and thus gain speed and efficiency.

The hull design did work well for its intended purpose, but it also had some drawbacks. One of the main drawbacks was that the boat tended to rock back and forth a lot when going over waves. This made it difficult to ride out waves and maintain a smooth, even ride. This type of movement is called “wave slamming” and it is very inefficient.

Flat Bottom

Flat Bottom hull

A flat bottom hull is one that has a very gradual slope from the waterline to the hull bottom. This type of hull is much more stable than a round bottomed boat or a boat with a blunt, pointed bow. The flat bottom hull is much better able to ride over waves and swells without being knocked about too much.

This makes the flat bottomed boat a good choice for those who like to travel the open seas. Because of this, it is often used by commercial fishing boats and pleasure craft. Flat bottomed boats are also popular with powerboat and jet ski enthusiasts.

Tri-Hulls (Tunnel Hulls)

A tunnel hull is a design feature that makes a boat much more stable. Basically, it consists of an extension of the hull that goes underneath the waterline. This extension has a very slight upward slope on either side. When a boat heels over, the weight of the boat is transferred to this area, which acts like a springboard. The effect is that the boat righted itself almost immediately.

This is a great feature to have on a boat that you are sailing because it will make it much more difficult for the boat to capsize. On a powerboat or a luxury boat, you probably won’t ever have to worry about this, but if you do need to get out of the boat, having a tunnel hull can really help.



A pontoon hull is a unique construction technique used to make boats much more seaworthy. Basically, what happens is, the boat builder hollows out the bottom of the boat and then covers it with wooden planks. 

These planks are fastened to the frame of the boat with metal rods. This allows the boat to flex and move with the waves, rather than being knocked around like a cork in the water. It also makes the boat much more buoyant, which means it will stay afloat even when heavily laden.

In fact, a properly built pontoon boat should be able to carry up to 500 pounds of cargo and still remain afloat. This is in stark contrast to the typical boat, which will quickly sink when it starts to take on water. A pontoon boat is a very stable craft and is much safer to drive than a traditional boat. 

In fact, many pontoon boats are equipped with an engine in the stern, just like a large powerboat. This means you can use the boat for both cruising and fishing and not have to worry about getting stranded because of a mechanical problem.

Semi-Displacement Hulls

A semi-displacement hull is a boat hull with a V-shaped cutout in it. This cutout is called a “semi-displacement” because it leaves a flat surface area on either side of the V-shape. A semi-displacement hull is stronger than a straight-up displacement hull because there are more flat surfaces for the water to flow around and not over.

A semi-displacement hull is typically used on smaller boats or rowboats. It allows for a more stable and seaworthy boat. It also makes for an easier and faster rowboat. You don’t have to work as hard to get the boat going because there are fewer obstructions for the water to push around. That means you can get moving right off the bat!



A multi-hull is a boat with more than one hull. It has more buoyancy and is able to withstand more weight than a single-hull boat. This allows it to carry more gear or people without sinking. Multi-hull boats have been around for centuries. However, the first modern multi-hulled boats were designed and built in the 1960s. These days, you can find them in all sizes and shapes.

Multi-hulled boats are usually faster and more stable than single-hulled boats of similar size. They tend to be safer too because they are less likely to capsize. That’s because if one hull is damaged, the other hulls will still be afloat. That means you have a chance to get your boat back to land. A single-hull boat with a hole in one of its sides is quite a different story!

Flat-Bottomed Hulls

A flat-bottomed hull is a boat hull with a bottom that slopes downward from both sides to a single point. This creates a unique and very stable hull shape that is easy to motor. Flat-bottomed boats are easy to trailer and they have a wide, flat, and even keel. This makes them very easy to unload cargo from.

They also have a low center of gravity which makes them very responsive to the helm of the boat driver. When you are standing on the deck of a flat-bottomed boat, it feels like the boat is floating on air. It’s almost as if the boat isn’t even touching the water at all. This is because there is such a small contact area between the hull of the boat and the water. Plus, the hull is so thin in relation to its size, that it has almost no effect on the water whatsoever.

Round-Bottomed Hulls

A round-bottomed hull is a boat hull with an especially shaped bottom that tapers upward from a blunt keel. This tapered shape is necessary for stability and seaworthiness. Round-bottomed boats have a fuller, more luxurious feel when compared to other hull shapes. Because of this, they are favored by many pleasure boaters and luxury yachts.

These types of boats tend to be stable in rough water and have a very long life. Because of their shape, they are also extremely seaworthy. In fact, many round-bottomed boats remain competitive even in rough seas. 

Their rounded bottoms provide exceptional stability and comfort. This shape also allows for a very dry ride. A dry ride is important to prevent the growth of mold and mildew, which is unsightly and can cause health problems.

V-Shaped Hulls

V-Shaped Hulls

The v-shaped hull is the most common hull shape for a boat. It is also the most seaworthy. Basically, a v-shaped hull is like a “U” with a flat bottom. The sides taper up to a point at the bow (front) of the boat. This point is called the “stem” or “stern”. A boat with a V-shaped hull has two bottoms. One is the actual bottom of the boat. 

This is the part that contacts the water. The other bottom is called the “transom”. It is the part that is above the waterline. The transom is where you will see the name of the boat written on the hull.

The advantage of having a v-shaped hull is that it is extremely seaworthy.

The disadvantage of having a v-shaped hull is that it is extremely seaworthy. This makes the boat very hard to turn and maneuver. Most people who enjoy boating just want to get from point A to point B as quickly as possible.


What type of structure is a ship’s hull?

A vessel’s hull is the body of the vessel, and can be made of fiberglass or steel. The hull is subdivided into sections called the upper and lower hull. The upper hull includes the structure of the bow and is known as the bow section.

The upper and lower hulls are connected to each other by a stiffener which is usually made of steel. This steel structure is called the keel. The bottom part of the vessel is called the lower hull and it includes the bulk of the vessel’s cargo carrying capacity.

How important is the construction of a ship’s hull?

Usually the construction of the hull is the most important factor when buying a ship. A low quality hull can result in a ship that does not have the necessary capacity, stability or longevity.

Hull construction also affects the resale value of a vessel. A hull constructed with sub-standard materials and workmanship will depreciate faster in value than one constructed with higher-quality materials and workmanship. Quality hulls are constructed with epoxy, fiberglass and other high-tech materials.

How thick is a ships hull?

The thickness of a ship’s hull varies by ship type. Some ships have hulls so thick that you could walk on them. The hulls of deep-sea fishing trawlers are often 12 to 15 inches thick.

You can get an idea of the thickness of the hulls on your own boat by looking at the information provided in the “Materials and Measurements” section of this publication. Most recreational boats have hulls between 3 and 7 inches thick.

How is the thickness of a ship’s hull measured?

The thickness of a ship’s hull is measured at right angles to the centerline. The thicknesses are measured at the forward perpendicular, at the after perpendicular, and at the midship section of the ship.

What boat hull is most stable?

The hull with the greatest area is the most stable. When the boat is listing (tilting sideways), the force on the sideways area is increased. If the boat has a large area sideways, it will be very hard to tip over.

However, a hull with a large area fore and aft will be extremely unstable. Therefore, the best hull for stability is one that is tall and narrow (like a canoe) rather than wide and flat like a modern commercial “cruiser” boat.

What is the most efficient hull design?

The more efficient the hull design, the less horsepower is required to move the boat at a given speed. Efficiency of a hull design depends on three factors: 1. The shape of the bottom surface 2. The shape of the top surface 3. And the material used to build the hull Let’s examine each of these factors separately.

Shape Of The Bottom Surface The shape of the bottom surface has a dramatic effect on the efficiency of a hull. In general, the more rounded the bottom, the more efficient the hull will be. Rounded bottoms act like an air cushion under the hull.


There are many different types of ship hulls. A ship’s hull is the part of the boat that is below the water line. The different types of hulls are designed to do different things.

There is another very interesting thing about the types of hulls and it is that they are designed according to different materials. In other words, the different types of hulls are designed to prevent different types of water from entering the ship.

The most important reason for knowing the different types of ship hulls is that it will help you choose the right one for your needs.