Sir George Cayley, 6th Baronet (27 December 1773 – 15 December 1857) was an English engineer, inventor, and aviator. He was a pioneer of aeronautical engineering and is sometimes referred to as "the father of aviation", He was also the inventor of the wire wheel.
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. Modern aeroplane design is based on those discoveries and on the cambered wings he proposed. He constructed the first flying model aeroplane and also diagrammed the elements of vertical flight. He correctly predicted that sustained flight would not occur until a lightweight engine was developed to provide adequate thrust and lift.
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 elected as a Vice-President of the Yorkshire Philosophical Society in 1824. 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, Yorkshire, inherited Brompton Hall, Wydale Hall and other estates on the death of his father, the 5th Baronet. Inspired by the optimism of the times, he engaged in a wide range of engineering projects. Among the many things that he developed are self-righting lifeboats, tension-spoke wheels, the "Universal Railway" (his term for caterpillar tractors), automatic signals for railway crossings, seat belts, small scale helicopters, and a kind of prototypical internal combustion engine fuelled by gunpowder (Gunpowder engine). He suggested that a more practical engine might be made using gaseous vapours rather than gunpowder, thus foreseeing the modern internal combustion engine. 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.<!--page170-->
According to the Institution of Mechanical Engineers, George Cayley was the inventor of the hot air engine in 1807:
Te Institution also commented on his second hot air engine of 1837 was a forerunner of the internal combustion engine:
Flying machines
thumb|upright|Cayley's glider in Mechanics' Magazine, 1852
Cayley 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), 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) revealed that even at school Cayley was developing his ideas on the theories of flight. It has been claimed 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.