Hovercraft

A hovercraft can move on many things.

It can go on water. It can go on land. It can even go on ice!

A hovercraft uses big blowers. These blowers push a lot of air under the craft.

This air makes a soft cushion.

The air pushes up on the craft. This makes it float. Because it floats, it can move over mud too.

Some hovercraft have a rubber skirt.

This skirt helps the craft go over bumps. It keeps the air inside.

People use them for many jobs. They help during disasters. They also carry people across the sea.

A hovercraft is a special vehicle. It can travel over land, water, mud, and ice.

Most hovercraft have a rounded shape. They look like a rectangle with soft edges.

How does it work? A hovercraft uses blowers to push air downward. This air goes under the bottom of the craft. This creates an air cushion. The air under the craft has high pressure. The air outside has lower pressure. This difference in pressure creates lift. Lift makes the craft float above the ground.

Many hovercraft use a skirt to help them. A skirt is a ring of rubber.

It hangs down from the craft. The air fills the skirt. This helps the craft go over bumps or waves. It also keeps the air trapped inside.

People use hovercraft for many jobs. They help during disasters. The military uses them to carry tanks and soldiers. Some carry hundreds of people across the sea.

In the UK, they carry people across the English Channel.

A hovercraft is a very special kind of vehicle. It is also called an air-cushion vehicle or ACV. These crafts are amazing because they can travel almost anywhere. They move easily over water, land, mud, and even ice.

This makes them great for many different jobs. They help with disaster relief and coastguard work. Some are used for military tasks or even for sport.

Because they do not need a road, they can go where other vehicles cannot.

How does a hovercraft stay up in the air? It works by using blowers to push a lot of air underneath the hull. This creates an air cushion. The air under the craft has high pressure. The air outside has lower pressure. This difference in pressure creates lift. This lift makes the hull float above the surface.

To keep the craft stable, the air is usually blown through holes or slots. This gives most hovercraft a rounded-rectangle shape.

Many people think of Christopher Cockerell when they think of the modern hovercraft. He was a British engineer who lived in the 1950s. He discovered a way to use a ring of air to hold the cushion. He called this a "momentum curtain." This special ring of air traps the high-pressure air inside. This means the craft needs much less power to fly. It uses much less power than a helicopter would. He even tested his models on carpets in front of government leaders.

There were many other ideas before Cockerell's success. In 1915, Dagobert Müller von Thomamühl built an air cushion boat. It was a fast torpedo boat that could reach 30 knots. In 1929, Andrew Kucher at Ford worked on Levapads. These were metal disks that used pressurized air. Later, in 1958, Ford showed a Glide-air model. This vehicle could speed on a thin film of air. It was only 76.2 micrometers above its roadbed.

One important part of a hovercraft is the skirt. A skirt is a ring of rubber that hangs down. Cecil Latimer-Needham helped develop the high skirt design. This allows the craft to climb over waves or bumps. Without a skirt, a hovercraft might hit a wave and stop.

Today, hovercraft are still used in places like the UK and Japan. Some carry hundreds of people across the English Channel. They are a clever way to move across the world.

A hovercraft is an amphibious vehicle known technically as an air-cushion vehicle, or ACV. These crafts are unique because they can travel over diverse surfaces like water, land, mud, and ice.

Unlike hydrofoils or ground effect vehicles, a hovercraft can lift itself while remaining perfectly still. This versatility makes them essential for specialized tasks. They are used in military operations, coastguard duties, and disaster relief. Some are even used for passenger services or high-speed sports.

The mechanism of flight relies on creating a pressure difference. Blowers inside the craft push a large volume of air beneath the hull to create an air cushion. This air has a higher pressure than the ambient air outside. This pressure difference produces lift, which causes the hull to float above the surface.

To maintain stability, the air is typically blown through slots or holes around the edge of the platform. This often results in a characteristic rounded-rectangle shape.

A major breakthrough in this technology was the development of the skirt. Early designs hovered too close to the surface and could be stopped by small waves. In 1958, Cecil Latimer-Needham suggested using two rings of rubber to create a double-walled extension. This high skirt design allows the craft to climb over obstacles nearly as high as the skirt itself.

When the engines are on, the skirt inflates to trap the air.

This allows the vehicle to maintain its momentum curtain even on uneven terrain.

The history of air-cushion travel spans over a century of experimentation. In 1870, John Isaac Thornycroft patented an early design, though engines were not yet powerful enough. In 1915, Dagobert Müller von Thomamühl built the first air cushion boat. It was a fast torpedo boat that reached speeds over 30 knots. However, it could only operate in water and could not transition to land.

Later, in 1929, Andrew Kucher at Ford experimented with Levapads. These were metal disks that used pressurized air to support loads on smooth factory floors.

Modern hovercraft design is most closely linked to British engineer Christopher Cockerell. In the early 1950s, Cockerell discovered the "momentum curtain" effect. By blowing air into the space between two concentric tin cans, he noticed a ring of airflow created a physical barrier. This barrier trapped high-pressure air inside a plenum. This method is highly efficient. A hovercraft needs only one quarter to one half of the power required by a helicopter to achieve lift.

Cockerell's work led to the development of the SR.N1 by Saunders-Roe. The SR.N1 was powered by a 450 hp Alvis Leonides engine. It successfully crossed the English Channel on July 25, 1959. During a flight, the Duke of Edinburgh even took the controls of the SR.N1. He flew so fast that the bow of the craft became dished, creating a permanent mark known as the "Royal Dent."

This craft proved that air-cushion technology was a viable method for large-scale transport.

Today, hovercraft serve various global roles with impressive scales of operation. Large versions have transported hundreds of people and vehicles across the English Channel. In the military, they carry tanks and soldiers through hostile environments.

While many commercial services have declined, two year-round public services remain. Hovertravel operates in the UK, and Oita Hovercraft resumed services in Japan in July 2025.

From racing to military defense, the air-cushion vehicle remains a vital tool for traversing the world's most difficult surfaces.