Hot air balloon

A hot air balloon is a big flying machine.

It has a large bag. Inside the bag is hot air. A burner makes a flame to heat the air. This hot air makes the bag rise up.

A basket hangs under the bag. People sit in the basket to fly. Some balloons are shaped like rocket ships.

People use them for fun today. It is a very old way to fly.

A hot air balloon is a way to fly.

It has a large bag called an envelope. This bag holds hot air. Beneath the bag, a basket or gondola carries people.

A burner makes a flame to heat the air. This burner uses fuel called propane. The hot air is lighter than the cold air outside. This makes the balloon rise up.

Hot air balloons are very old. The Montgolfier brothers made one in France. In 1783, two men made the first free flight.

Today, people fly balloons for fun. Some balloons have many shapes. They can look like rocket ships or even bees.

Pilots use a vent at the top to let air out. This helps the balloon go down. Some balloons are very small. These are called Hoppers.

Large balloons can carry over two dozen people at once.

A hot air balloon is a special way to fly through the sky.

It is a lighter-than-air aircraft that uses heat to stay up. The main part is a large fabric bag called an envelope.

Hanging underneath this bag is a basket or a gondola. This basket carries the passengers and the tools needed for flight. A burner sits above the basket to heat the air.

This burner uses a liquid fuel called propane to make a flame. The hot air inside the bag is less dense than the cold air outside. This difference in density is what makes the balloon rise.

Watching a balloon work is like watching a slow, floating dance.

First, a fan blows cold air into the envelope to start it. Next, the pilot uses the propane burner to heat that air. As the air gets hot, it pushes against the inside of the fabric. The envelope is made of strong nylon or polyester. The bottom of the bag stays open to let air flow in. This keeps the pressure inside the same as the air outside. To go down, the pilot opens a vent at the top.

This vent is often a fabric flap called a parachute vent. It lets the hot air escape so the balloon can descend.

People have been interested in flying for a very long time.

Long ago, sky lanterns were used for military signals in China. In 1709, a priest named Bartolomeu de Gusmão showed an unmanned model in Brazil. The Montgolfier brothers later developed the first real hot air balloons in France.

They showed an unmanned flight in September 1783. A few weeks later, the first free flight with humans happened. Jean-François Pilâtre de Rozier and François Laurent d'Arlandes flew in Paris. This was the first successful human-carrying flight in history.

There are many amazing records for these flying machines.

In 1991, a balloon called the Virgin Pacific Flyer set a speed record. It was a huge balloon with a volume of 74,000 cubic meters.

In 1999, Bertrand Piccard and Brian Jones flew around the whole world. They traveled for 19 days, 21 hours, and 55 minutes. Vijaypat Singhania set an altitude record in 2005. He reached 69,852 feet while flying over Mumbai, India. These numbers show just how far humans can go in the sky.

Today, most people use hot air balloons for fun and recreation.

You might see balloons shaped like rocket ships or even bees.

Some balloons are very small and are called Hoppers.

These tiny ones can only carry one person. Other large balloons can carry more than two dozen people at once. They are great for seeing the world from a new view. Flying in a balloon is a wonderful way to see the Earth.

A hot air balloon is a lighter-than-air aircraft that uses heated air to achieve buoyancy.

This technology is significant because it represents the first successful human-carrying flight technology in history. The aircraft consists of a large fabric bag known as an envelope.

Suspended beneath this envelope is a gondola or a wicker basket. In some high-altitude or long-distance missions, this basket is replaced by a specialized capsule. The balloon carries both passengers and a heat source to maintain flight.

This heat source is typically an open flame produced by burning liquid propane.

The physics of flight rely on the concept of density. The heated air inside the envelope has a lower density than the colder air outside.

This density difference creates buoyancy, which allows the balloon to rise. The envelope does not need to be sealed at the bottom. This is because the air pressure inside the envelope remains roughly equal to the surrounding atmospheric pressure. To control the flight, pilots use a vent at the top of the envelope.

A common type is the parachute vent, which is a disk-shaped fabric flap. By pulling a control line, the pilot opens this vent to release hot air. Releasing this air allows the balloon to slow its ascent or begin a descent. Some balloons also feature turning vents on the sides to help the pilot rotate the basket.

Modern hot air balloons are complex machines built with specific materials. The envelope is usually constructed from ripstop nylon or dacron, which is a type of polyester.

During manufacturing, fabric panels are sewn together using techniques like the French felled seam. This method involves folding two pieces of fabric over each other and using two rows of parallel stitching. The envelope is divided into sections called gores, which can number anywhere from 4 to over 24. At the very top, a metal hoop called a crown ring holds the vertical load tapes. These tapes carry the weight of the gondola through cables, often called flying wires, which connect to the basket via carabiners. The area closest to the burner, known as the inlet, is made of fire-resistant Nomex.

Humanity has explored the skies through various precursors to the modern balloon. During the Three Kingdoms era in China, sky lanterns were used for military signaling.

In the 13th century, the Mongolian army used these Kongming lanterns during the Battle of Legnica. In the 18th century, the Jesuit priest Bartolomeu de Gusmão envisioned an aerial apparatus in Brazil. In 1709, King John V of Portugal funded an unmanned demonstration of Gusmão's project. Later, the Montgolfier brothers developed the hot air balloon in France. They demonstrated an unmanned flight on September 19, 1783.

On November 21, 1783, Jean-François Pilâtre de Rozier and François Laurent d'Arlandes completed the first untethered manned flight in Paris.

Ballooning has produced many incredible records regarding speed, altitude, and distance.

On November 26, 2005, Vijaypat Singhania reached an altitude of 69,852 feet over Mumbai, India. This surpassed the previous record of 45,000 feet set by Per Lindstrand in 1988. In 1991, Per Lindstrand and Richard Branson flew the "Virgin Pacific Flyer" from Japan to Northern Canada. This balloon was the largest ever built, with an envelope volume of 74,000 cubic meters.

It also set a ground speed record of 186.7 miles per hour. In 1999, Bertrand Piccard and Brian Jones completed the first nonstop trip around the world. They traveled for 19 days, 21 hours, and 55 minutes, landing in the Egyptian desert.

Balloons come in many different sizes to suit different needs. Small, one-person balloons are called "Hoppers" or "Cloudhoppers."

These have an envelope volume as small as 60 cubic meters. On the other end of the scale, commercial sightseeing balloons can carry over two dozen people. These large envelopes can have volumes up to 100,000 cubic meters. The most common size for recreational use is approximately 2,800 cubic meters, which carries 3 to 5 people. Modern balloons are often used for fun and can be shaped like rocket ships or even bees.

Beyond simple drifting, some specialized aircraft are designed for more control. Thermal airships are balloons that can be propelled through the air rather than just drifting with the wind.

This ability to move independently of the wind changes how the aircraft interacts with the atmosphere. While most modern balloons are used for recreation, the technology remains a vital part of aviation history. From military observation in 1794 to modern record-breaking expeditions, the hot air balloon continues to connect us to the sky.