Aeronautics

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Space Shuttle Atlantis on a Shuttle Carrier Aircraft Atlantis on Shuttle Carrier Aircraft.jpg
Space Shuttle Atlantis on a Shuttle Carrier Aircraft

Aeronautics is the science or art involved with the study, design, and manufacturing of air flight-capable machines, and the techniques of operating aircraft and rockets within the atmosphere. The British Royal Aeronautical Society identifies the aspects of "aeronautical Art, Science and Engineering" and "The profession of Aeronautics (which expression includes Astronautics)." [1]

Contents

While the term originally referred solely to operating the aircraft, it has since been expanded to include technology, business, and other aspects related to aircraft. [2] The term "aviation" is sometimes used interchangeably with aeronautics, although "aeronautics" includes lighter-than-air craft such as airships, and includes ballistic vehicles while "aviation" technically does not. [2]

A significant part of aeronautical science is a branch of dynamics called aerodynamics, which deals with the motion of air and the way that it interacts with objects in motion, such as an aircraft.

History

Early ideas

Designs for flying machines by Leonardo da Vinci, c. 1490 Leonardo da Vinci helicopter and lifting wing.jpg
Designs for flying machines by Leonardo da Vinci, c. 1490

Attempts to fly without any real aeronautical understanding have been made from the earliest times, typically by constructing wings and jumping from a tower with crippling or lethal results. [3]

Wiser investigators sought to gain some rational understanding through the study of bird flight. Medieval Islamic Golden Age scientists such as Abbas ibn Firnas also made such studies. [4] [5] [6] [7] The founders of modern aeronautics, Leonardo da Vinci in the Renaissance and Cayley in 1799, both began their investigations with studies of bird flight.

Man-carrying kites are believed to have been used extensively in ancient China. In 1282 the Italian explorer Marco Polo described the Chinese techniques then current. [8] The Chinese also constructed small hot air balloons, or lanterns, and rotary-wing toys.

An early European to provide any scientific discussion of flight was Roger Bacon, who described principles of operation for the lighter-than-air balloon and the flapping-wing ornithopter, which he envisaged would be constructed in the future. The lifting medium for his balloon would be an "aether" whose composition he did not know. [9]

In the late fifteenth century, Leonardo da Vinci followed up his study of birds with designs for some of the earliest flying machines, including the flapping-wing ornithopter and the rotating-wing helicopter. Although his designs were rational, they were not based on particularly good science. [10] Many of his designs, such as a four-person screw-type helicopter, have severe flaws. He did at least understand that "An object offers as much resistance to the air as the air does to the object." [11] (Newton would not publish the Third law of motion until 1687.) His analysis led to the realisation that manpower alone was not sufficient for sustained flight, and his later designs included a mechanical power source such as a spring. Da Vinci's work was lost after his death and did not reappear until it had been overtaken by the work of George Cayley.

Balloon flight

Francesco Lana de Terzi's flying boat concept c. 1670 Flying boat.png
Francesco Lana de Terzi's flying boat concept c. 1670

The modern era of lighter-than-air flight began early in the 17th century with Galileo's experiments in which he showed that air has weight. Around 1650 Cyrano de Bergerac wrote some fantasy novels in which he described the principle of ascent using a substance (dew) he supposed to be lighter than air, and descending by releasing a controlled amount of the substance. [12] Francesco Lana de Terzi measured the pressure of air at sea level and in 1670 proposed the first scientifically credible lifting medium in the form of hollow metal spheres from which all the air had been pumped out. These would be lighter than the displaced air and able to lift an airship. His proposed methods of controlling height are still in use today; by carrying ballast which may be dropped overboard to gain height, and by venting the lifting containers to lose height. [13] In practice de Terzi's spheres would have collapsed under air pressure, and further developments had to wait for more practicable lifting gases.

Montgolfier brothers flight, 1784 Montgolfier brothers flight.jpg
Montgolfier brothers flight, 1784

From the mid-18th century the Montgolfier brothers in France began experimenting with balloons. Their balloons were made of paper, and early experiments using steam as the lifting gas were short-lived due to its effect on the paper as it condensed. Mistaking smoke for a kind of steam, they began filling their balloons with hot smoky air which they called "electric smoke" and, despite not fully understanding the principles at work, made some successful launches and in 1783 were invited to give a demonstration to the French Académie des Sciences.

Meanwhile, the discovery of hydrogen led Joseph Black in c. 1780 to propose its use as a lifting gas, though practical demonstration awaited a gas-tight balloon material. On hearing of the Montgolfier Brothers' invitation, the French Academy member Jacques Charles offered a similar demonstration of a hydrogen balloon. Charles and two craftsmen, the Robert brothers, developed a gas-tight material of rubberised silk for the envelope. The hydrogen gas was to be generated by chemical reaction during the filling process.

The Montgolfier designs had several shortcomings, not least the need for dry weather and a tendency for sparks from the fire to set light to the paper balloon. The manned design had a gallery around the base of the balloon rather than the hanging basket of the first, unmanned design, which brought the paper closer to the fire. On their free flight, De Rozier and d'Arlandes took buckets of water and sponges to douse these fires as they arose. On the other hand, the manned design of Charles was essentially modern. [14] As a result of these exploits, the hot air balloon became known as the Montgolfière type and the gas balloon the Charlière.

Charles and the Robert brothers' next balloon, La Caroline , was a Charlière that followed Jean Baptiste Meusnier's proposals for an elongated dirigible balloon, and was notable for having an outer envelope with the gas contained in a second, inner ballonet. On 19 September 1784, it completed the first flight of over 100 km, between Paris and Beuvry, despite the man-powered propulsive devices proving useless.

In an attempt the next year to provide both endurance and controllability, de Rozier developed a balloon having both hot air and hydrogen gas bags, a design which was soon named after him as the Rozière. The principle was to use the hydrogen section for constant lift and to navigate vertically by heating and allowing to cool the hot air section, in order to catch the most favourable wind at whatever altitude it was blowing. The balloon envelope was made of goldbeater's skin. The first flight ended in disaster and the approach has seldom been used since. [15]

Cayley and the foundation of modern aeronautics

Sir George Cayley (1773–1857) is widely acknowledged as the founder of modern aeronautics. He was first called the "father of the aeroplane" in 1846 [16] and Henson called him the "father of aerial navigation." [3] He was the first true scientific aerial investigator to publish his work, which included for the first time the underlying principles and forces of flight. [17]

In 1809 he began the publication of a landmark three-part treatise titled "On Aerial Navigation" (1809–1810). [18] In it he wrote the first scientific statement of the problem, "The whole problem is confined within these limits, viz. to make a surface support a given weight by the application of power to the resistance of air." He identified the four vector forces that influence an aircraft: thrust , lift , drag and weight and distinguished stability and control in his designs.

He developed the modern conventional form of the fixed-wing aeroplane having a stabilising tail with both horizontal and vertical surfaces, flying gliders both unmanned and manned.

He introduced the use of the whirling arm test rig to investigate the aerodynamics of flight, using it to discover the benefits of the curved or cambered aerofoil over the flat wing he had used for his first glider. He also identified and described the importance of dihedral, diagonal bracing and drag reduction, and contributed to the understanding and design of ornithopters and parachutes. [3]

Another significant invention was the tension-spoked wheel, which he devised in order to create a light, strong wheel for aircraft undercarriage.

The 19th century: Otto Lilienthal and the first human flights

Lilienthal in mid-flight, Berlin c. 1895 Otto Lilienthal gliding experiment ppmsca.02546.jpg
Lilienthal in mid-flight, Berlin c. 1895

During the 19th century Cayley's ideas were refined, proved and expanded on, culminating in the works of Otto Lilienthal.

Lilienthal was a German engineer and businessman who became known as the "flying man". [19] He was the first person to make well-documented, repeated, successful flights with gliders, [20] therefore making the idea of "heavier than air" a reality. Newspapers and magazines published photographs of Lilienthal gliding, favourably influencing public and scientific opinion about the possibility of flying machines becoming practical.

His work lead to him developing the concept of the modern wing. [21] [22] His flight attempts in Berlin in the year 1891 are seen as the beginning of human flight [23] and the "Lilienthal Normalsegelapparat" is considered to be the first air plane in series production, making the Maschinenfabrik Otto Lilienthal in Berlin the first air plane production company in the world. [24]

Otto Lilienthal is often referred to as either the "father of aviation" [25] [26] [27] or "father of flight". [28]

Other important investigators included Horatio Phillips.

Branches

The Eurofighter Typhoon Typhoon f2 zj910 arp.jpg
The Eurofighter Typhoon
Antonov An-225 Mriya, the largest aeroplane ever built An-225 Mriya.jpg
Antonov An-225 Mriya, the largest aeroplane ever built

Aeronautics may be divided into three main branches, Aviation, Aeronautical science and Aeronautical engineering.

Aviation

Aviation is the art or practice of aeronautics. Historically aviation meant only heavier-than-air flight, but nowadays it includes flying in balloons and airships.

Aeronautical engineering

Aeronautical engineering covers the design and construction of aircraft, including how they are powered, how they are used and how they are controlled for safe operation. [29]

A major part of aeronautical engineering is aerodynamics, the science of passing through the air.

With the increasing activity in space flight, nowadays aeronautics and astronautics are often combined as aerospace engineering.

Aerodynamics

The science of aerodynamics deals with the motion of air and the way that it interacts with objects in motion, such as an aircraft.

The study of aerodynamics falls broadly into three areas:

Incompressible flow occurs where the air simply moves to avoid objects, typically at subsonic speeds below that of sound (Mach 1).

Compressible flow occurs where shock waves appear at points where the air becomes compressed, typically at speeds above Mach 1.

Transonic flow occurs in the intermediate speed range around Mach 1, where the airflow over an object may be locally subsonic at one point and locally supersonic at another.

Rocketry

Launch of Apollo 15 Saturn V rocket: T – 30 s through T + 40 s.

A rocket or rocket vehicle is a missile, spacecraft, aircraft or other vehicle which obtains thrust from a rocket engine. In all rockets, the exhaust is formed entirely from propellants carried within the rocket before use. [30] Rocket engines work by action and reaction. Rocket engines push rockets forwards simply by throwing their exhaust backwards extremely fast.

Rockets for military and recreational uses date back to at least 13th-century China. [31] Significant scientific, interplanetary and industrial use did not occur until the 20th century, when rocketry was the enabling technology of the Space Age, including setting foot on the Moon.

Rockets are used for fireworks, weaponry, ejection seats, launch vehicles for artificial satellites, human spaceflight and exploration of other planets. While comparatively inefficient for low speed use, they are very lightweight and powerful, capable of generating large accelerations and of attaining extremely high speeds with reasonable efficiency.

Chemical rockets are the most common type of rocket and they typically create their exhaust by the combustion of rocket propellant. Chemical rockets store a large amount of energy in an easily released form, and can be very dangerous. However, careful design, testing, construction and use minimizes risks.

See also

Related Research Articles

<span class="mw-page-title-main">Aircraft</span> Vehicle or machine that is able to fly by gaining support from the air

An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or the dynamic lift of an airfoil, or, in a few cases, direct downward thrust from its engines. Common examples of aircraft include airplanes, helicopters, airships, gliders, paramotors, and hot air balloons.

<span class="mw-page-title-main">Aerodynamics</span> Branch of dynamics concerned with studying the motion of air

Aerodynamics is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dynamics and its subfield of gas dynamics, and is an important domain of study in aeronautics. The term aerodynamics is often used synonymously with gas dynamics, the difference being that "gas dynamics" applies to the study of the motion of all gases, and is not limited to air. The formal study of aerodynamics began in the modern sense in the eighteenth century, although observations of fundamental concepts such as aerodynamic drag were recorded much earlier. Most of the early efforts in aerodynamics were directed toward achieving heavier-than-air flight, which was first demonstrated by Otto Lilienthal in 1891. Since then, the use of aerodynamics through mathematical analysis, empirical approximations, wind tunnel experimentation, and computer simulations has formed a rational basis for the development of heavier-than-air flight and a number of other technologies. Recent work in aerodynamics has focused on issues related to compressible flow, turbulence, and boundary layers and has become increasingly computational in nature.

<span class="mw-page-title-main">Unpowered aircraft</span> Aerial vehicle capable of sustaining flight without onboard propulsion

Unpowered aircraft can remain airborne for a significant period of time without onboard propulsion. They can be classified as gliders, lighter-than-air balloons and tethered kites. In the case of kites, lift is obtained by tethering to a fixed or moving object, perhaps another kite, to obtain a flow of wind over the lifting surfaces. In the case of balloons, lift is obtained through inherent buoyancy and the balloon may or may not be tethered. Free balloon flight has little directional control. Gliding aircraft include sailplanes, hang gliders, and paragliders that have full directional control in free flight.

<span class="mw-page-title-main">Fixed-wing aircraft</span> Heavier-than-air aircraft with fixed wings generating aerodynamic lift

A fixed-wing aircraft is a heavier-than-air flying machine, such as an airplane, which is capable of flight using wings that generate lift caused by the aircraft's forward airspeed and the shape of the wings. Fixed-wing aircraft are distinct from rotary-wing aircraft, and ornithopters. The wings of a fixed-wing aircraft are not necessarily rigid; kites, hang gliders, variable-sweep wing aircraft and airplanes that use wing morphing are all examples of fixed-wing aircraft.

<span class="mw-page-title-main">Aviation</span> Design, development, production, operation and use of aircraft

Aviation includes the activities surrounding mechanical flight and the aircraft industry. Aircraft includes fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air craft such as hot air balloons and airships.

<span class="mw-page-title-main">Flight</span> Process by which an object moves, through an atmosphere or beyond it

Flight or flying is the process by which an object moves through a space without contacting any planetary surface, either within an atmosphere or through the vacuum of outer space. This can be achieved by generating aerodynamic lift associated with gliding or propulsive thrust, aerostatically using buoyancy, or by ballistic movement.

<span class="mw-page-title-main">History of aviation</span>

The history of aviation extends for more than two thousand years, from the earliest forms of aviation such as kites and attempts at tower jumping to supersonic and hypersonic flight by powered, heavier-than-air jets.

<span class="mw-page-title-main">Ornithopter</span> Aircraft which use flapping movement of the wings to generate lift

An ornithopter is an aircraft that flies by flapping its wings. Designers sought to imitate the flapping-wing flight of birds, bats, and insects. Though machines may differ in form, they are usually built on the same scale as flying animals. Larger, crewed ornithopters have also been built and some have been successful. Crewed ornithopters are generally either powered by engines or by the pilot.

<span class="mw-page-title-main">Otto Lilienthal</span> German aviation pioneer (1848–1896)

Karl Wilhelm Otto Lilienthal was a German pioneer of aviation who became known as the "flying man". He was the first person to make well-documented, repeated, successful flights with gliders, therefore making the idea of "heavier than air" a reality. Newspapers and magazines published photographs of Lilienthal gliding, favourably influencing public and scientific opinion about the possibility of flying machines becoming practical.

This is a list of aviation-related events from 1905:

<span class="mw-page-title-main">Aerostat</span> Lighter-than-air aircraft

An aerostat is a lighter-than-air aircraft that gains its lift through the use of a buoyant gas. Aerostats include unpowered balloons and powered airships. A balloon may be free-flying or tethered. The average density of the craft is lower than the density of atmospheric air, because its main component is one or more gasbags, a lightweight skin containing a lifting gas to provide buoyancy, to which other components such as a gondola containing equipment or people are attached. Especially with airships, the gasbags are often protected by an outer envelope.

This is a list of aviation-related events during the 18th century :

This is a list of aviation-related events during the 19th century :

<span class="mw-page-title-main">Airplane</span> Powered, flying vehicle with wings

An airplane, or aeroplane, informally plane, is a fixed-wing aircraft that is propelled forward by thrust from a jet engine, propeller, or rocket engine. Airplanes come in a variety of sizes, shapes, and wing configurations. The broad spectrum of uses for airplanes includes recreation, transportation of goods and people, military, and research. Worldwide, commercial aviation transports more than four billion passengers annually on airliners and transports more than 200 billion tonne-kilometers of cargo annually, which is less than 1% of the world's cargo movement. Most airplanes are flown by a pilot on board the aircraft, but some are designed to be remotely or computer-controlled such as drones.

<span class="mw-page-title-main">Early flying machines</span> Aircraft developed before the modern aeroplane

Early flying machines include all forms of aircraft studied or constructed before the development of the modern aeroplane by 1910. The story of modern flight begins more than a century before the first successful manned aeroplane, and the earliest aircraft thousands of years before.

<span class="mw-page-title-main">Hybrid airship</span> Partially aero-static aircraft

A hybrid airship is a powered aircraft that obtains some of its lift as a lighter-than-air (LTA) airship and some from aerodynamic lift as a heavier-than-air aerodyne.

James D. DeLaurier is an inventor and professor emeritus of the University of Toronto Institute for Aerospace Studies. He is a leader in design and analysis of lighter than air vehicles and flapping winged aircraft.

<span class="mw-page-title-main">Paul Bikle</span> American aviator

Paul F. Bikle was director of the U.S. National Aeronautics and Space Administration (NASA) Dryden Flight Research Facility from 1959 until 1971, and author of more than 40 technical publications. He was associated with major aeronautical research programs including the hypersonic X-15 rocket plane, and was a world record-setting glider pilot.

<span class="mw-page-title-main">Aerospace engineering</span> Branch of engineering

Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches: aeronautical engineering and astronautical engineering. Avionics engineering is similar, but deals with the electronics side of aerospace engineering.

Aerodynamics is a branch of dynamics concerned with the study of the motion of air. It is a sub-field of fluid and gas dynamics, and the term "aerodynamics" is often used when referring to fluid dynamics

References

Citations

  1. ↑ A Learned and Professional Society Archived 2014-02-09 at the Wayback Machine (Retrieved 8 March 2014)
  2. 1 2 Aeronautics. Vol. 1. Grolier. 1986. p. 226.
  3. 1 2 3 Wragg 1974.
  4. ↑ Lévi-Provençal, E. (1986). "ʿAbbās b. Firnās". In Bearman, P.; Bianquis, Th.; Bosworth, C.E.; van Donzel, E.; Heinrichs, W.P. (eds.). Encyclopaedia of Islam. Vol. I (2nd ed.). Brill publishers. p. 11.
  5. ↑ How Invention Begins: Echoes of Old Voices in the Rise of New Machines By John H. Lienhard
  6. ↑ John H. Lienhard (2004). "'Abbas Ibn Firnas". The Engines of Our Ingenuity. Episode 1910. NPR. KUHF-FM Houston. Transcript.
  7. ↑ Lynn Townsend White, Jr. (Spring, 1961). "Eilmer of Malmesbury, an Eleventh Century Aviator: A Case Study of Technological Innovation, Its Context and Tradition", Technology and Culture2 (2), p. 97-111 [100f.]
  8. ↑ Pelham, D.; The Penguin book of kites, Penguin (1976)
  9. ↑ Wragg 1974, pp. 10–11.
  10. ↑ Wragg 1974, p. 11.
  11. ↑ Fairlie & Cayley 1965, p. 163.
  12. ↑ Ege 1973, p. 6.
  13. ↑ Ege 1973, p. 7.
  14. ↑ Ege 1973, pp. 97–100.
  15. ↑ Ege 1973, p. 105.
  16. ↑ Fairlie & Cayley 1965.
  17. ↑ "Sir George Carley". Flyingmachines.org. Archived from the original on 2009-02-11. Retrieved 2009-07-26. Sir George Cayley is one of the most important people in the history of aeronautics. Many consider him the first true scientific aerial investigator and the first person to understand the underlying principles and forces of flight.
  18. ↑ Cayley, George. "On Aerial Navigation" Part 1 Archived 2013-05-11 at the Wayback Machine , Part 2 Archived 2013-05-11 at the Wayback Machine , Part 3 Archived 2013-05-11 at the Wayback Machine Nicholson's Journal of Natural Philosophy, 1809–1810. (Via NASA). Raw text Archived 2016-03-03 at the Wayback Machine . Retrieved: 30 May 2010.
  19. ↑ "Killed In Trying To Fly", New York Herald, August 12, 1896, retrieved 11 June 2019
  20. ↑ DLR baut das erste Serien-Flugzeug der Welt nach 2017. Retrieved: 3 March 2017.
  21. ↑ "Otto-Lilienthal-Museum Anklam".
  22. ↑ "The Lilienthal glider project". Archived from the original on 2022-03-07. Retrieved 2022-02-26.
  23. ↑ "Otto-Lilienthal-Museum Anklam".
  24. ↑ "Like a bird".
  25. ↑ "DPMA | Otto Lilienthal".
  26. ↑ "In perspective: Otto Lilienthal".
  27. ↑ "Remembering Germany's first "flying man"". The Economist. 20 September 2011.
  28. ↑ "Otto Lilienthal, the Glider King". 23 May 2020.
  29. ↑ Aeronautical engineering Archived 2012-07-27 at the Wayback Machine , University of Glasgow.
  30. ↑ Sutton, George (2001). "1". Rocket Propulsion Elements (7th ed.). Chichester: John Wiley & Sons. ISBN   978-0-471-32642-7.
  31. ↑ MSFC History Office. "Rockets in Ancient Times (100 B.C. to 17th Century)". A Timeline of Rocket History. NASA. Archived from the original on 2009-07-09. Retrieved 2009-06-28.

Sources

  • Ege, L. (1973). Balloons and airships. Blandford.
  • Fairlie, Gerard; Cayley, Elizabeth (1965). The life of a genius. Hodder and Stoughton.
  • Wragg, D.W. (1974). Flight before flying. Osprey. ISBN   978-0850451658.
  • Lawrence W. Reithmaier, Ernest James Gentle (1980). Aviation Space Dictionary. Aero Publishers. ISBN   0816830029.

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