George Cayley

For his grandson, the cricketer, see George Cayley (cricketer).
Sir George Cayley
Bt

George Cayley
Born (1773-12-27)27 December 1773
Scarborough, Yorkshire, England, Kingdom of Great Britain
Died 15 December 1857(1857-12-15) (aged 83)
Brompton, Yorkshire, England, United Kingdom
Citizenship British
Nationality English
Fields Aviation, Aerodynamics, Aeronautics, Aeronautical engineering
Known for Designed first successful human glider. Discovered the four aerodynamic forces of flight weight, lift, drag, thrust and cambered wings, basis for the design of the modern aeroplane.

Sir George Cayley, 6th Baronet (27 December 1773 – 15 December 1857) was a prolific English engineer and is one of the most important people in the history of aeronautics. Many consider him to be the first true scientific aerial investigator and the first person to understand the underlying principles and forces of flight.[1]

In 1799 he set forth the concept of the modern aeroplane as a fixed-wing flying machine with separate systems for lift, propulsion, and control.[2] [3] He was a pioneer of aeronautical engineering and is sometimes referred to as "the father of aviation",[1] Designer of the first glider to carry a human being aloft, he discovered and identified the four aerodynamic forces of flight, which act on any flying vehicle: weight, lift, drag, and thrust. Modern aeroplane design is based on those discoveries, and also on the importance of cambered wings, also identified by Cayley.[4]

He worked over half a century before the development of powered flight; his importance was acknowledged by the Wright brothers.[5][6] He constructed the first flying model aeroplane and also diagrammed the elements of vertical flight.[7]

A replica of Cayley's glider being flown by Derek Piggott in 1973

Cayley represented the Whig party as Member of Parliament for Scarborough from 1832 to 1835, and in 1838 helped found the UK's first Polytechnic Institute, the Royal Polytechnic Institution (now University of Westminster) and served as its chairman for many years. He was a founding member of the British Association for the Advancement of Science and was a distant cousin of the mathematician Arthur Cayley.

General engineering projects

Cayley, from Brompton-by-Sawdon, near Scarborough in Yorkshire, inherited Brompton Hall and Wydale Hall and other estates on the death of his father, the 5th baronet. Captured by the optimism of the times, he engaged in a wide variety of engineering projects. Among the many things that he developed are self-righting lifeboats, tension-spoke wheels, [8] the "Universal Railway" (his term for caterpillar tractors),[9] automatic signals for railway crossings,[10] seat belts, small scale helicopters, and a kind of prototypical internal combustion engine fuelled by gunpowder. He suggested that a more practical engine might be made using gaseous vapours rather than gunpowder, thus foreseeing the modern internal combustion engine.[11] He also contributed in the fields of prosthetics, air engines, electricity, theatre architecture, ballistics, optics and land reclamation, and held the belief that these advancements should be freely available.[12]

Flying machines

Yorkshire Air Museum

He is mainly remembered for his pioneering studies and experiments with flying machines, including the working, piloted glider that he designed and built. He wrote a landmark three-part treatise titled "On Aerial Navigation" (1809–1810),[13] which was published in Nicholson's Journal of Natural Philosophy, Chemistry and the Arts. The 2007 discovery of sketches in Cayley's school notebooks (held in the archive of the Royal Aeronautical Society Library)[14] revealed that even at school Cayley was developing his ideas on the theories of flight. It has been claimed[15] that these images indicate that Cayley identified the principle of a lift-generating inclined plane as early as 1792. To measure the drag on objects at different speeds and angles of attack, he later built a "whirling-arm apparatus", a development of earlier work in ballistics and air resistance. He also experimented with rotating wing sections of various forms in the stairwells at Brompton Hall.

These scientific experiments led him to develop an efficient cambered airfoil and to identify the four vector forces that influence an aircraft: thrust, lift, drag, and gravity. He discovered the importance of the dihedral angle for lateral stability in flight, and deliberately set the centre of gravity of many of his models well below the wings for this reason; these principles influenced the development of hang gliders. As a result of his investigations into many other theoretical aspects of flight, many now acknowledge him as the first aeronautical engineer. His emphasis on lightness led him to invent a new method of constructing lightweight wheels which is in common use today. For his landing wheels, he shifted the spoke's forces from compression to tension by making them from tightly-stretched string, in effect "reinventing the wheel".[16][17] Wire soon replaced the string in practical applications and over time the wire wheel came into common use on bicycles, cars, aeroplanes and many other vehicles.

The model glider successfully flown by Cayley in 1804 had the layout of a modern aircraft, with a kite-shaped wing towards the front and an adjustable tailplane at the back consisting of horizontal stabilisers and a vertical fin. A movable weight allowed adjustment of the model's centre of gravity.[18] Around 1843 he was the first to suggest the idea for a convertiplane, an idea which was published in a paper written that same year. At some time before 1849 he designed and built a biplane in which an unknown ten-year-old boy flew. Later, with the continued assistance of his grandson George John Cayley and his resident engineer Thomas Vick, he developed a larger scale glider (also probably fitted with "flappers") which flew across Brompton Dale in front of Wydale Hall in 1853. The first adult aviator has been claimed to be either Cayley's coachman, footman or butler: one source (Gibbs-Smith) has suggested that it was John Appleby, a Cayley employee: however there is no definitive evidence to fully identify the pilot. An entry in volume IX of the 8th Encyclopædia Britannica of 1855 is the most contemporaneous authoritative account regarding the event. A 2007 biography of Cayley (Richard Dee's The Man Who Discovered Flight: George Cayley and the First Airplane) claims the first pilot was Cayley's grandson George John Cayley (1826–1878). A replica of the 1853 machine was flown at the original site in Brompton Dale by Derek Piggott in 1973[19] for TV and in the mid-1980s[20] for the IMAX film On the Wing. The glider is currently on display at the Yorkshire Air Museum.[21] Another replica, piloted by Allan McWhirter,[22] flew in Salina, Kansas just before Steve Fossett landed the Virgin Atlantic GlobalFlyer there in March 2003, and later piloted by Richard Branson at Brompton in summer 2003.[23]

Memorial

Cayley is commemorated in Scarborough at the University of Hull, Scarborough Campus, where a hall of residence and a teaching building are named after him. He is one of many scientists and engineers commemorated by having a hall of residence and a bar at Loughborough University named after him. The University of Westminster also honours Cayley's contribution to the formation of the institution with a gold plaque at the entrance of the Regent Street building.

There are display boards and a video film at the Royal Air Force Museum London in Hendon honouring Cayley's achievements and a modern exhibition and film "Pioneers of Aviation" at the Yorkshire Air Museum, Elvington,York. The Sir George Cayley Sailwing Club is a Yorkshire-based free flight club, affiliated to the British Hang Gliding and Paragliding Association, which has borne his name since its founding in 1975.[24]

Ancestry

See also

Notes

  1. 1 2
  2. ↑ "Aviation History". Retrieved 26 July 2009.
  3. ↑ "Sir George Cayley (British Inventor and Scientist)". Britannica. Retrieved 26 July 2009.
  4. ↑ C. H. Gibbs-Smith (20 September 1962) New Light on Cayley Flight International, link from Flightglobal
  5. ↑ "The Pioneers: Aviation and Airmodelling". Retrieved 26 July 2009.
  6. ↑ Dee, Richard. Retrieved: 30 May 2010.
  7. ↑ "U.S Centennial of Flight Commission.". Retrieved 10 September 2008.
  8. ↑ In his notebook, dated March 19, 1808, Cayley proposed that in order to produce "the lightest possible wheel for aerial navigation cars," one should "do away with wooden spokes altogether and refer the whole firmness of the wheel to the strength of the rim only, by the intervention of tight strong cording … " See: J.A.D. Ackroyd (2011) "Sir George Cayley: The invention of the aeroplane near Scarborough at the time of Trafalgar," Journal of Aeronautical History [Internet publication], paper no. 6, pages 130–181. Cayley's tension-spoke wheel appears on page 152, "3.7 The Tension Wheel, 1808".
  9. ↑ "Sir George Cayley's patent universal railway," Mechanics' Magazine, 5 (127) : 225–227 (Jan. 28, 1826).
  10. ↑ George Cayley (February 13, 1841) "Essay on the means of promoting safety in railway carriages," Mechanics' Magazine, 34 (914) : 129–133. See also letters in reply on pages 180–181.
  11. ↑ Raleigh, W; The War in the Air, Vol. 1, Clarendon 1922.
  12. ↑ Ackroyd, J.A.D. Sir George Cayley, the father of Aeronautics Notes Rec. R. Soc. Lond. 56 (2), 167–181 (2002). Retrieved: 29 May 2010.
  13. ↑ Cayley, George. "On Aerial Navigation" Part 1, Part 2, Part 3 Nicholson's Journal of Natural Philosophy, 1809–1810. (Via NASA). Raw text. Retrieved: 30 May 2010.
  14. ↑ http://www.adsadvance.co.uk/sir-george-cayley-s-notebooks-featured-on-antiques-roadshow.html
  15. ↑ Dee, Richard (2007). The Man who Discovered Flight: George Cayley and the First Airplane. Toronto: McClelland and Stewart. ISBN 978-0-7710-2971-4.
  16. ↑ Pritchard, J. Laurence. Summary of First Cayley Memorial Lecture at the Brough Branch of the Royal Aeronautical Society Flight number 2390 volume 66 page 702, 12 November 1954. Retrieved: 29 May 2010"
  17. ↑ John Lloyd and John Mitchinson; QI: The Second Book of General Ignorance, Faber & Faber 2010, Page 1.
  18. ↑ Gibbs-Smith 2002, p. 35
  19. ↑ Piggott, Derek. Gliding 1852 Style Gliding Magazine issue 10, 2003. Accessed 11 August 2008
  20. ↑ Short, Simine. Stamps that tell a story Gliding Magazine issue 10, 2003. Retrieved: 29 May 2010
  21. ↑ "Cayley glider".
  22. ↑ Cayley Flyer, oldest plane welcomes home Virgin Atlantic GlobalFlyer Virgin, 4 March 2005. Retrieved: 29 May 2010.
  23. ↑ Duplicate better than the original Popular Mechanics page 20, November 2003. Retrieved: 29 May 2010.
  24. ↑ "Sir George Cayley Sailwing Club". cayleyparagliding.co.uk. Retrieved July 2015.

References

External links

Parliament of the United Kingdom
Preceded by
Charles Manners-Sutton
Edmund Phipps		 Member of Parliament for Scarborough
1832–1835
With: Sir John Vanden-Bempde-Johnstone, Bt		 Succeeded by
Sir John Vanden-Bempde-Johnstone, Bt
Sir Frederick Trench
Baronetage of England
Preceded by
Thomas Cayley		 Baronet
(of Brompton)
1792–1857 		Succeeded by
Digby Cayley
This article is issued from Wikipedia - version of the Tuesday, April 26, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.