Aircraft

Aircraft are things that fly in the air.

Some use big bags of gas to float. This helps them stay up like a ship on water.

Other aircraft use wings to fly. Air moves past the wings to lift them up. Some have spinning wings called rotors. This is how a helicopter flies.

People can fly these machines. A pilot sits inside to steer. Some machines have no pilot. Computers or people use a remote to move them. Flying is a very big part of our world.

An aircraft is a vehicle that can fly.

Some aircraft float in the air. These are called aerostats. They use gas like helium or hot air to float. This works just like a ship on water.

Other aircraft are heavier than air. They must find lift to stay up. One way is using an airfoil. An airfoil is a special wing shape. When air moves past it, the wing lifts up.

Fixed-wing aircraft have wings that do not move. Airplanes and gliders use this way. Gliders are special because they have no engine.

Some aircraft use a rotor. A rotor is a set of blades that spins. These are called rotorcraft. Helicopters use rotors to fly.

People can fly these machines. We call the pilot an onboard pilot. Some aircraft have no pilot. These are called drones. Computers or people control them from far away.

An aircraft is any vehicle built to fly in the air.

These machines must fight against gravity to stay up. Some aircraft use buoyancy to float like a ship on water. These are called aerostats. They use large cells filled with gases like helium or hot air.

Because these gases are less dense than the air, the craft stays aloft. Other aircraft are heavier than the air around them. These must find a way to create lift to fly.

There are different ways that lift happens. One way is through an airfoil, which is a special wing shape. When air flows past this shape, it creates upward force. Fixed-wing aircraft, like airplanes or gliders, move forward to make this happen. Gliders are unique because they fly without any engine. Another way to fly is using a rotor. A rotor is a set of blades that spins around a mast.

This is how rotorcraft, such as helicopters, generate lift.

Humans have dreamed of flight for thousands of years. People in China used kites for flight many centuries before the common era.

In the 15th century, Leonardo da Vinci drew designs for flying machines. However, people did not have the right tools to build them then. In the late 1700s, the Montgolfier brothers invented the hot-air balloon. This led to the first manned flights in balloons. Later, Sir George Cayley helped develop the science of aerodynamics. He was the first to discover the four major forces of flight.

Important milestones changed how we travel through the sky. In 1903, the Wright brothers flew the first successful airplane. By 1909, aircraft began to look more like the planes we see today. Ferdinand von Zeppelin pioneered large, steerable airships.

After World War II, jet engines changed everything for travelers. These engines made flight much faster and more reliable. Today, we even use pilotless drones for many different jobs.

Aircraft come in many different sizes and shapes. The Airlander 10 is a huge hybrid blimp. It can stay in the air for two weeks. The Antonov An-225 Mriya was the largest fixed-wing aircraft ever built.

It was a Soviet-built plane with six engines. It held records for carrying the heaviest loads. You can see how aircraft relate to things you know. A helicopter's rotor works like a spinning fan to push air. An airship floats just like a boat on a lake.

An aircraft is any device used or intended for flight in the air.

To fly, a vehicle must overcome the constant downward pull of gravity. This is achieved by generating lift, which is an upward force. The study of how aircraft are designed and built is called aeronautics. The human activity surrounding these machines is known as aviation. Aircraft can be categorized by how they stay aloft, how they move, or how they are used. Some are flown by a pilot, while others are unmanned aerial vehicles, often called drones. These drones can be controlled by a person from a distance or by onboard computers.

There are two primary ways to achieve flight: through buoyancy or through dynamic lift. Lighter-than-air aircraft, or aerostats, use buoyancy to float. They function much like a ship floating on water. These craft use large cells or canopies filled with gases like helium or hydrogen. They may also use hot air. Because these gases are less dense than the surrounding atmosphere, they create upward pressure.

Small versions, such as sky lanterns, were invented in China before the 3rd century BC. While balloons are general aerostats, the term airship usually refers to large, powered designs.

Heavier-than-air aircraft, known as aerodynes, are denser than the air around them. They must generate enough lift to counteract their own weight. This is often done using an airfoil, which is a specific wing shape. When air flows across an airfoil, it creates aerodynamic lift. Fixed-wing aircraft, such as airplanes and gliders, move the entire vehicle forward to force air over the wings. Gliders are unique because they do not use an engine to achieve this movement. Another method is through rotorcraft, which include helicopters and autogyros. These machines use a rotor, which is an assembly of blades spinning around a vertical mast.

This spinning motion creates the necessary lift to stay airborne.

Some specialized designs use different methods to fly. A lifting body generates lift through the shape of its entire fuselage rather than using separate wings. NASA experimented with these designs during the 1960s and 1970s. There are also powered-lift aircraft capable of vertical takeoff and landing (VTOL). This includes jet aircraft like the Harrier or tiltrotors like the Bell Boeing V-22 Osprey. These machines must transition from vertical to lateral movement during flight. An ornithopter is another type that produces lift by flapping wings, similar to a bird.

The history of aviation spans over two thousand years. Early examples include Chinese kites, which used air pressure differences to fly. In the 15th century, Leonardo da Vinci designed flying machines based on aeronautical concepts. However, these remained unworkable due to the technology of that era. In the late 18th century, the Montgolfier brothers invented the hot-air balloon. This era also saw the discovery of hydrogen gas, leading to hydrogen balloons. Sir George Cayley later helped develop modern aerodynamics by studying fluid dynamics and Newton's laws of motion.

Significant progress occurred in the 19th and 20th centuries. Scientists like Otto Lilienthal and Octave Chanute conducted glider experiments to understand wing dynamics. In 1903, the Wright brothers achieved the first controlled, powered, manned flight in an airplane. By 1909, aircraft began to adopt a standard configuration, including a cruciform tail.

Ferdinand von Zeppelin pioneered rigid, steerable airships that dominated long-distance travel until the 1930s. After World War II, the development of jet engines revolutionized both military and civilian aviation. In the latter half of the 20th century, digital electronics introduced "fly-by-wire" systems to improve flight control.

Aircraft vary wildly in size and capability. The Airlander 10 is a massive hybrid blimp that can stay airborne for two weeks. It can carry a payload of up to 5,000 kilograms. On the other hand, the Antonov An-225 Mriya was the largest fixed-wing aircraft ever built.

This Soviet-built transport had a wingspan of 88.4 meters. It held the world record for payload and was the heaviest aircraft ever constructed, with a maximum loaded weight of 640,000 kilograms. While the An-225 was destroyed during the Russo-Ukrainian War, it remains a famous example of heavy-lift engineering.