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In aeronautics, a balloon is an unpowered aerostat, which remains aloft or floats due to its buoyancy. A balloon may be free, moving with the wind, or tethered to a fixed point. It is distinct from an airship, which is a powered aerostat that can propel itself through the air in a controlled manner.
- 1 Principles
- 2 History
- 3 Modern ballooning
- 4 Ballooning records
- 5 See also
- 6 References
- 7 External links
A balloon is conceptually the simplest of all flying machines. The balloon is a fabric envelope filled with a gas that is lighter than the surrounding atmosphere. As the entire balloon is less dense than its surroundings, it rises, taking along with it a basket, attached underneath, which carries passengers or payload. Although a balloon has no propulsion system, a degree of directional control is possible through making the balloon rise or sink in altitude to find favorable wind directions.
There are three main types of balloon:
- The hot air balloon or Montgolfière obtains its buoyancy by heating the air inside the balloon. It has become the most common type.
- The gas balloon or Charlière is inflated with a gas of lower molecular weight than the ambient atmosphere. Most gas balloons operate with the internal pressure of the gas the same as the pressure of the surrounding atmosphere. A superpressure balloon can operate with the lifting gas at pressure that exceeds that of the surrounding air, with the objective of limiting or eliminating the loss of gas from day-time heating. Gas balloons are filled with gases such as:
- hydrogen – originally used extensively but since the Hindenburg disaster is now seldom used due to its high flammability.
- Coal gas - Although giving around half the lift of hydrodgen, extensively used during the nineteenth and early twentieth century since it was cheaper than hydrogen and readily available.
- helium – used today for all airships and most manned gas balloons.
- Other gases have included ammonia, and methane, but these have poor lifting capacity and other safety defects and have never been widely used.
- The Rozière type has both heated and unheated lifting gases in separate gasbags. This type of balloon is sometimes used for long-distance record flights such as the recent circumnavigations, but is not otherwise in use.
Both the hot air, or Montgolfière, balloon and the gas balloon are still in common use. Montgolfière balloons are relatively inexpensive as they do not require high-grade materials for their envelopes, and they are popular for balloonist sport activity.
Hot air balloons
When heated, air expands, so a given volume of space contains less air. This makes it lighter and, if its lifting power is greater than the weight of the balloon containing it, it will lift the balloon upwards. A hot air balloon can only stay up while it has fuel for its burner, to keep the air hot enough.
The Montgolfiers' early hot air balloons used a solid-fuel brazier which proved less practical than the hydrogen balloons that had followed almost immediately, and hot air ballooning soon died out.
In the 1950s, the convenience and low cost of bottled gas burners led to a revival of hot air ballooning for sport and leisure.
The height or altitude of a hot air balloon is controlled by turning the burner up or down as needed, unlike a gas balloon where ballast weights are often carried so that they can be dropped if the balloon gets too low, and in order to land some lifting gas must be vented through a valve.
A man-carrying balloon using the light gas hydrogen for buoyancy was made by Professor Jacques Charles and flown less than a month after the Montgolfier flight, on 1 December 1783. Gas balloons have greater lift for a given volume, so they do not need to be so large, and they can also stay up for much longer than hot air, so gas balloons dominated ballooning for the next 200 years. In the 19th century, it was common to use town gas to fill balloons; this was not as light as pure hydrogen gas, having about half the lifting power, but it was much cheaper and readily available.
Light gas balloons are predominant in scientific applications, as they are capable of reaching much higher altitudes for much longer periods of time. They are generally filled with helium. Although hydrogen has more lifting power, it is explosive in an atmosphere rich in oxygen. With a few exceptions, scientific balloon missions are unmanned.
There are two types of light-gas balloons: zero-pressure and superpressure. Zero-pressure balloons are the traditional form of light-gas balloon. They are partially inflated with the light gas before launch, with the gas pressure the same both inside and outside the balloon. As the zero-pressure balloon rises, its gas expands to maintain the zero pressure difference, and the balloon's envelope swells.
At night, the gas in a zero-pressure balloon cools and contracts, causing the balloon to sink. A zero-pressure balloon can only maintain altitude by releasing gas when it goes too high, where the expanding gas can threaten to rupture the envelope, or releasing ballast when it sinks too low. Loss of gas and ballast limits the endurance of zero-pressure balloons to a few days.
A superpressure balloon, in contrast, has a tough and inelastic envelope that is filled with light gas to pressure higher than that of the external atmosphere, and then sealed. The superpressure balloon cannot change size greatly, and so maintains a generally constant volume. The superpressure balloon maintains an altitude of constant density in the atmosphere, and can maintain flight until gas leakage gradually brings it down.
Superpressure balloons offer flight endurance of months, rather than days. In fact, in typical operation an Earth-based superpressure balloon mission is ended by a command from ground control to open the envelope, rather than by natural leakage of gas.
High-altitude balloons are used as high flying vessels to carry scientific instruments (like weather balloons), or reach near-space altitudes to take footage or photos of the earth. These balloons can fly over 100,000 feet (30.5 km) into the air, and are designed to burst at a set altitude where the parachute will deploy to safely carry the payload back to earth.
Early hot air balloons could not stay up for very long because they used a lot of fuel, while early hydrogen balloons were difficult to take higher or lower as desired because the aeronaut could only vent the gas or drop off ballast a limited number of times. Pilâtre de Rozier realised that for a long-distance flight such as crossing the English Channel, the aeronaut would need to make use of the differing wind directions at different altitudes. It would be essential therefore to have good control of altitude while still able to stay up for a long time. He developed a combination balloon having two gas bags, the Rozier balloon. The upper one held hydrogen and provided most of the steady lift. The lower one held hot air and could be quickly heated or cooled to provide the varying lift for good altitude control.
In 1785 Pilâtre de Rozier took off in an attempt to fly across the Channel, but shortly into the flight the hydrogen gas bag caught fire and de Rozier did not survive the ensuing accident. This earned de Rozier the title "The First to Fly and the First to Die".
It wasn't until the 1980s that technology was developed to allow safe operation of the Rozier type, for example by using non-flammable helium as the lifting gas, and several designs have successfully undertaken long-distance flights.
Tethering and kite balloons
As an alternative to free flight, a balloon may be tethered to allow reliable take off and landing at the same location. Some of the earliest balloon flights were tethered for safety, and since then balloons have been tethered for many purposes, including military observation and aerial barrage, meteorological and commercial uses.
The natural spherical shape of a balloon is unstable in high winds. Tethered balloons for use in windy conditions are often stabilised by aerodynamic shaping and connecting to the tether by a halter arrangement. These are called kite balloons.
A kite balloon is distinct from a kytoon, which obtains a portion of its lift aerodynamically.
Unmanned hot air balloons are popular in Chinese history. Zhuge Liang of the Shu Han kingdom, in the Three Kingdoms era (220–280 AD) used airborne lanterns for military signaling. These lanterns are known as Kongming lanterns (孔明灯).
In 1709 the Portuguese cleric Bartolomeu de Gusmão made a balloon filled with heated air rise inside a room in Lisbon. He is also claimed to have built a balloon named Passarola (Big bird) and attempted to lift himself from Saint George Castle in Lisbon, landing about one kilometre away. This claim is not generally recognized by aviation historians outside the Portuguese speaking community, in particular the FAI.
The first modern balloons
The first recorded manned flight was made in a hot air balloon built by the Montgolfier brothers on 21 November 1783. The flight started in Paris and reached a height of 500 feet or so. The pilots, Jean-François Pilâtre de Rozier and François Laurent d'Arlandes, covered about 5½ miles in 25 minutes.
On 1 December 1783, Professor Jacques Charles and the Robert brothers made the first gas balloon flight, also from Paris. Their hydrogen-filled balloon flew to almost 2,000 feet (600 m), stayed aloft for over 2 hours and covered a distance of 27 miles (43 km), landing in the small town of Nesles-la-Vallée.
Pilâtre Rozier took part in a further flight on 23 June 1784, in a modified version of the Montgolfiers' first balloon christened La Marie-Antoinette after the Queen, which took off in front of the King of France and King Gustav III of Sweden. Together with Joseph Proust, the balloon flew north at an altitude of approximately 3,000 metres, above the clouds. They travelled 52 km in 45 minutes before cold and turbulence forced them to descend past Luzarches, between Coye et Orry-la-Ville, near the Chantilly forest. They set records for speed, altitude and distance travelled.
The first aircraft disaster occurred in May 1785 when the town of Tullamore, County Offaly, Ireland was seriously damaged when the crash of a balloon resulted in a fire that burned down about 100 houses, making the town home to the world's first aviation disaster. To this day, the town shield depicts a phoenix rising from the ashes.
Jean-Pierre Blanchard went on to make the first manned flight of a balloon in America on 9 January 1793, after touring Europe to set the record for the first balloon flight in countries including the Austrian Netherlands, Germany, the Netherlands and Poland. His hydrogen filled balloon took off from a prison yard in Philadelphia, Pennsylvania. The flight reached 5,800 feet (1,770 m) and landed in Gloucester County, New Jersey. President George Washington was among the guests observing the takeoff.
Gas balloons became the most common type from the 1790s until the 1960s. The French military observation balloon L'Intrépide of 1795 is the oldest preserved aircraft in Europe; it is on display in the Heeresgeschichtliches Museum in Vienna. Jules Verne wrote a short, non-fiction story, published in 1852, about being stranded aboard a hydrogen balloon.
The earliest successful balloon flight recorded in Australia was by William Dean in 1858. His balloon was gas-filled and travelled 30 km with two people aboard.
Henri Giffard also developed a tethered balloon for passengers in 1878 in the Tuileries Garden in Paris. The first tethered balloon in modern times was made in France at Chantilly Castle in 1994 by Aerophile SA.
The first military use of a balloon was at the Battle of Fleurus in 1794, when L'Entreprenant was used by the French Aerostatic Corps to watch the movements of the enemy. On 2 April 1794, an aeronauts corps was created in the French army; however, given the logistical problems linked with the production of hydrogen on the battlefield (it required constructing ovens and pouring water on white-hot iron), the corps was disbanded in 1799.
Balloons were used by the British Royal Engineers in 1885 for reconnaissance and observation purposes during the Bechuanaland Expedition and the Sudan Expedition. Although experiments in Britain had been conducted as early as 1863, a School of Ballooning was not established at Chatham, Medway, Kent until 1888. During the Anglo-Boer War (1899–1902), use was made of observation balloons. A 11,500 cubic feet (330 m3) balloon was kept inflated for 22 days and marched 165 miles into the Transvaal with the British forces.
Hydrogen-filled balloons were widely used during World War I (1914–1918) to detect enemy troop movements and to direct artillery fire. Observers phoned their reports to officers on the ground who then relayed the information to those who needed it. Balloons were frequently targets of opposing aircraft. Planes assigned to attack enemy balloons were often equipped with incendiary bullets, for the purpose of igniting the hydrogen.
The Aeronaut Badge was established by the United States Army in World War I to denote service members who were qualified balloon pilots. Observation balloons were retained well after the Great War, being used in the Russo-Finnish Wars, the Winter War of 1939–40, and the Continuation War of 1941–45.
During World War II the Japanese launched thousands of helium "fire balloons" against the United States and Canada. In Operation Outward the British used balloons to carry incendiaries to Nazi Germany.
Large helium balloons are used by the South Korean government and private activists advocating freedom in North Korea. They float hundreds of kilometers across the border carrying news from the outside world, illegal radios, foreign currency and gifts of personal hygiene supplies. A North Korean military official has described it as "psychological warfare" and threatened to attack South Korea if their release continued.
Hot air returns
Ed Yost redesigned the hot air balloon in the late 1950s using rip-stop nylon fabrics and high-powered propane burners to create the modern hot air balloon. His first flight of such a balloon, lasting 25 minutes and covering 3 miles (5 km), occurred on 22 October 1960 in Bruning, Nebraska. Yost's improved design for hot air balloons triggered the modern sport balloon movement. Today, hot air balloons are much more common than gas balloons.
In the late 1970s the British hot air balloonist Julian Nott constructed a hot air balloon using technologies he believed would have been available to the Nazca culture of Peru some 1500 to 2000 years earlier, and demonstrated that it could fly. and again in 2003, Nott has speculated that the Nazca might have used it as a tool for designing the famous Nazca ground figures and lines.
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Tethered gas balloons have been installed as amusement rides in Paris since 1999, in Berlin since 2000, in Disneyland Paris since 2005, in the San Diego Wild Animal Park since 2005, in Walt Disney World in Orlando since 2009, and the DHL Balloon in Singapore in 2006. Modern tethered gas balloons are made by Aerophile SAS.
Hot air balloons used in sport flying are sometimes made a special designs to advertise a company or product, such as the Chubb fire extinguisher illustrated.
The Echo satellite was a balloon satellite launched into Earth orbit in 1960 and used for passive relay of radio communication. PAGEOS was launched in 1966 for worldwide satellite triangulation, allowing for greater precision in the calculation of different locations on the planet's surface.
Ben Abruzzo was the first man to cross the Pacific Ocean in a hot air Balloon.
On 31 August 1933, Alexander Dahl took the first picture of the Earth's curvature in an open hydrogen gas balloon.
The helium-filled Explorer II balloon, piloted by US Army Air Corps officers Capt. Orvil A. Anderson, Maj. William E. Kepner and Capt. Albert W. Stevens, reached a new record height of 22,066 m (72,395 ft) on 11 November 1935. This followed the same crew's previous near-fatal plunge in July 1934 in a predecessor craft, Explorer, after its canopy ruptured just 190 m (624 ft) short (it transpired) of the then-current altitude record of 22,000 m (72,178 ft) set by the Soviet balloon Osoaviakhim-1.
The previous altitude record for a manned balloon was set at 34,668 m (113,739 ft) on 4 May 1961 by Malcolm Ross and Victor Prather in the Strato-Lab V balloon payload launched from the deck of the USS Antietam in the Gulf of Mexico.
On 1 March 1999 Bertrand Piccard and Brian Jones set off in the balloon Breitling Orbiter 3 from Château d'Oex in Switzerland on the first non-stop balloon circumnavigation around the globe. They landed in Egypt after a 40,814 km (25,361 mi) flight lasting 19 days, 21 hours and 55 minutes.
The altitude record for an unmanned balloon is 53.0 kilometres (173,882 ft), reached with a volume of 60,000 cubic metres. The balloon was launched by JAXA on 25 May 2002 from Iwate Prefecture, Japan. This is the greatest height ever obtained by an atmospheric vehicle. Only rockets, rocket planes, and ballistic projectiles have flown higher.
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