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A flying saucer (also referred to as a flying disc) is a descriptive term for a supposed type of flying craft having a disc or saucer-shaped body, commonly used generically to refer to an anomalous flying object. The term was coined in 1930 but has generally been supplanted since 1952 by the United States Air Force term unidentified flying objects or UFO's. Early reported sightings of unknown "flying saucers" usually described them as silver or metallic, sometimes reported as covered with navigation lights or surrounded with a glowing light, hovering or moving rapidly, either alone or in tight formations with other similar craft, and exhibiting high maneuverability.
While disc-shaped flying objects have been interpreted as being sporadically recorded since the Middle Ages, the first recorded use of the term "flying saucer" for an unidentified flying object was to describe a probable meteor that fell over Texas and Oklahoma on June 17, 1930. "Some who saw the weird light described it as a huge comet, a flaming flying saucer, a great red glow, a ball of fire." The highly publicized sighting by Kenneth Arnold on June 24, 1947, resulted in the popularity of the term "flying saucer" by U.S. newspapers. Although Arnold never specifically used the term "flying saucer", he was quoted at the time saying the shape of the objects he saw was like a "saucer", "disc", or "pie-plate", and several years later added he had also said "the objects moved like saucers skipping across the water." Both the terms flying saucer and flying disc were used commonly and interchangeably in the media until the early 1950s.
Arnold's sighting was followed by thousands of similar sightings across the world. Such sightings were once very common, to such an extent that "flying saucer" was a synonym for UFO through the 1960s before it began to fall out of favor. A lot of sightings of the cigar-shaped UFO were reported following it. More recently, the flying saucer has been largely supplanted by other alleged UFO-related vehicles, such as the black triangle. The term UFO was, in fact, invented in 1952, to try to reflect the wider diversity of shapes being seen. However, unknown saucer-like objects are still reported, such as in the widely publicized 2006 sighting over Chicago-O'Hare airport.
Many of the alleged flying saucer photographs of the era are now believed to be hoaxes. The flying saucer is now considered largely an icon of the 1950s and of B-movies in particular, and is a popular subject in comic science fiction.
Beyond the common usage of the phrase, there have also been man-made saucer-like craft. The first flying disc craft was called the Discopter and was patented by Alexander Weygers in 1944. Other designs have followed, such as the American Vought V-173 / XF5U "Flying Flapjack", the British GFS Projects flying saucer, or the British "S.A.U.C.E.R." ("Saucer Aircraft Utilising Coanda Effect Reactions") flying saucer, by inventor Alf Beharie.
A record of a saucer-shaped object is from 1290 of a silver disc flying over a village in Yorkshire. Disc-like flying objects were occasionally reported throughout the millennium. For example, in a mass sighting over Nuremberg in 1561, discs and spheres were reported emerging from large cylinders (see woodcut at left). They are also claimed by ufologists to frequently show up in religious artwork.
Another well-documented instance to specifically compare the objects to saucers was the Kenneth Arnold sighting on June 24, 1947, while Arnold was flying near Mount Rainier. He reported seeing 9 brightly reflecting vehicles, one shaped like a crescent but the others more disc- or saucer-shaped, flying in an echelon formation, weaving like the tail of a kite, flipping and flashing in the sun, and traveling with a speed of at least 1,200 miles per hour (1,900 km/h). In addition to the saucer or disc shape (Arnold also used the terms "pie plate" and half-moon shaped), he also later said he described the motion of the craft as "like a saucer if you skip it across water", leading to the term "flying saucer" and also "flying disc" (which were synonymous for a number of years).
Immediately following the report, hundreds of sightings of usually saucer-like objects were reported across the United States and also in some other countries. The most widely publicized of these was the sighting by a United Airlines crew on July 4 of nine more disc-like objects pacing their plane over Idaho, not far from Arnold's initial sighting. On July 8, the Army Air Force base at Roswell, New Mexico issued a press release saying that they had recovered a "flying disc" from a nearby ranch, the so-called Roswell UFO incident, which was front-page news until the military issued a retraction saying that it was a weather balloon.
On July 9, the Army Air Force Directorate of Intelligence, assisted by the FBI, began a secret study of the best of the flying saucer reports, including Arnold's and the United Airlines' crew. Three weeks later they issued an intelligence estimate describing the typical characteristics reported (including that they were often reported as disc-like and metallic) and concluded that something was really flying around. A follow-up investigation by the Air Materiel Command at Wright Field, Ohio arrived at the same conclusion. A widespread official government study of the saucers was urged by General Nathan Twining. This led to the formation of Project Sign (also known as Project Saucer) at the end of 1947, the first public Air Force UFO study. This evolved into Project Grudge (1949–1951) and then Project Blue Book (1952–1970).
The term "flying saucer" quickly became deeply ingrained in the English vernacular. A Gallup poll from August 1947 found that 90% had heard about the mysterious flying saucers or flying discs, and a 1950 Gallup poll found that 94% of those polled had heard the term, easily beating out all other mentioned commonly used terms in the news such as "Cold War", "universal military training", and "bookie."
Air Force statistics indicated that the basic saucer-shape continued to be the most commonly reported one through the 1950s and 1960s until Project Blue Book ended in 1970. There have been some claims, still undocumented by scientific study, that reports of saucers began to decline in the 1970s, being supplanted by other craft such as black triangles, cylinders, and amorphous shapes. It has also been asserted that despite the increase in portable cameras, photographs dwindled as Cold War and Space Race interest decreased and a number of notable images were exposed as fakes.
In addition to the extraterrestrial hypothesis, a variety of possible explanations for flying saucers have been put forward. One of the most common states that most photos of saucers were hoaxes; cylindrical metal objects such as pie tins, hubcaps and dustbin lids were easy to obtain, and the poor focus seen in UFO images makes the true scale of the object difficult to ascertain. However, some photos and movies were deemed authentic after intensive study. An example was the saucer-like object photographed by farmer Paul Trent near Portland, Oregon in 1950, which passed all tests when studied by the Condon Committee in the 1960s.
A third theory puts all saucer sightings down to a form of mass hysteria. Arnold described the craft he saw as saucer-like but not perfectly round (he described them as thin, flat, rounded in front but chopped in back and coming to a point), but the image of the circular saucer was fixed in the public consciousness. The theory posits that as the use of the term flying saucer in popular culture decreased, so too did sightings.
Long before the Kenneth Arnold sighting of 1947 and the adoption of the term "flying saucer" by the public, depictions of streamlined saucer-shaped aircraft or spacecraft had appeared in the popular press, dating back to at least 1911. In particular, commentators like Milton Rothman have noted the appearance of the "flying saucers" concept in the fantasy artwork of the 1930s pulp science fiction magazines, by artists like Frank R. Paul. Frank Wu, a notable contemporary science fiction illustrator, has written:
The point is that the idea of space vehicles shaped like flying saucers was imprinted in the national psyche for many years prior to 1947, when the Roswell incident took place. It didn't take much stretching for the first observers of UFOs to assume that the unknown objects hovering in the sky had the same disk shape as the science fictional vehicles.
However, one Air Force commissioned study contradicted some of these contentions. A scientific and statistical analysis of 3200 Air Force cases by the Battelle Memorial Institute from 1952 to 1954 found that most were indeed due to natural phenomena, about 2% were due to hoaxes or psychological effects and only 0.4% were thought due to clouds. Other very minor contributors were birds, light phenomena such as mirages or searchlights, and various miscellany such as flares or kites. The vast majority of identified objects (about 84%) were explained as balloons, aircraft, or astronomical objects. However, about 22% of all sightings still defied any plausible explanation by the team of scientists, and percentage of unidentifieds rose to 33% for the best witnesses and cases. Thus when carefully studied, a substantial fraction of reports (given the available data) is currently not understood.
Fata Morgana (mirages) and flying saucers
Fata Morgana, a type of mirage, may be responsible for some flying saucers sightings, by displaying objects located below the astronomical horizon hovering in the sky, and magnifying and distorting them.
Similarly some unidentifieds seen on radar might also be due to Fata Morgana-type atmospheric phenomena, though more technically known as "anomalous propagation" and more commonly as "radar ghosts". Official UFO investigations in France suggest:
As is well known, atmospheric ducting is the explanation for certain optical mirages, and in particular the arctic illusion called "fata morgana" where distant ocean or surface ice, which is essentially flat, appears to the viewer in the form of vertical columns and spires, or "castles in the air."
People often assume that mirages occur only rarely. This may be true of optical mirages, but conditions for radar mirages are more common, due to the role played by water vapor which strongly affects the atmospheric refractivity in relation to radio waves. Since clouds are closely associated with high levels of water vapor, optical mirages due to water vapor are often rendered undetectable by the accompanying opaque cloud. On the other hand, radar propagation is essentially unaffected by the water droplets of the cloud so that changes in water vapor content with altitude are very effective in producing atmospheric ducting and radar mirages.
Manmade flying saucer aircraft
The first documented patent for a lenticular flying machine was submitted by Romanian inventor Henri Coanda. He made a functional small scale model which was flown in 1932 and a patent was granted in 1935  At a Symposionum organized by the Romanian Academy in 1967 Coanda said:
"These airplanes we have today are no more than a perfection of a toy made of paper children use to play with. My opinion is we should search for a completely different flying machine, based on other flying principles. I consider the aircraft of the future, that which will take off vertically, fly as usual and land vertically. This flying machine should have no parts in movement. The idea came from the huge power of the cyclons" 
Other attempts have been made, with limited success, to produce manned vehicles based on the flying saucer design. While some, such as the Avrocar and M200G Volantor have been produced in limited numbers, most fail to leave the drawing board. The Avrocar, with vertical takeoff and landing, was originally intended to replace both the Jeep and the helicopter in combat situations, but proved to be inadequate for both. In spite of a powerful turbojet, it could not rise more than four or five feet off the ground, i.e., out of ground effect. Thus, the Avrocar could be seen as a prototype for the early generations of hovercraft, lacking only a 'skirt' to make it a truly effective example of the type. Unmanned saucers have had more success; the Sikorsky Cypher is a saucer-like UAV which uses the disc-shaped shroud to protect rotor blades.
Some more advanced flying saucers capable of spaceflight have been proposed, often as black projects by aeronautics companies. The Lenticular Reentry Vehicle was a secret project run by Convair for a saucer device which could carry both astronauts and nuclear weapons into orbit; the nuclear-powered system was planned in depth, but is not believed to have ever flown. More exotically, British Rail worked on plans for the British Rail "Space Vehicle" a proposed, saucer-shaped craft based on so far undiscovered technologies such as nuclear fusion and superconductivity, which was supposed to have been able to transport multiple passenger between planets, but never went beyond the patent stage.
There is at least one design that received a US patent in 2005: U.S. Patent 6,960,975 It claims to be "propelled by the pressure of inflationary vacuum state".
Additionally, a professor at the University of Florida has begun work on a Wingless Electromagnetic Air Vehicle (WEAV) for NASA which has received public interest because of its coincidental resemblance to a flying saucer.
In popular culture
After 1947, the flying saucer quickly became a stereotypical symbol of both extraterrestrials and science fiction, and features in many films of mid-20th century science fiction, including The Atomic Submarine, The Day the Earth Stood Still, Plan 9 from Outer Space, Earth vs. the Flying Saucers, as well as the television series The Invaders. As the flying saucer was surpassed by other designs and concepts, it fell out of favor with straight science-fiction movie makers, but continued to be used ironically in comedy movies, especially in reference to the low-budget B movies which often featured saucer-shaped alien craft.
MGM, however, gave its high production value 1956 film Forbidden Planet a flying saucer called the United Planets Cruiser C-57D, presenting a plausible human exploration, faster-than-light starship of the 23rd century. In the 1965-1968 TV show Lost in Space, the Robinson family had a disc-shaped space ship. Saucers appeared in the 1994-1998 television series Babylon 5 as the standard ship design used by a race called the Vree. Aliens in the 1996 film Independence Day attacked humanity in giant city-sized saucer-shaped space ships.
The sleek, silver flying saucer in particular is seen as a symbol of 1950s culture; the motif is common in Googie architecture and in Atomic Age décor. The image is often invoked retrofuturistically to produce a nostalgic feel in period works, especially in comic science fiction; both Mars Attacks! and Destroy All Humans! draw on the flying saucer as part of the larger satire of 1950s B movie tropes.
The Twilight Zone episodes "The Monsters Are Due on Maple Street", "Third from the Sun", "Death Ship", "To Serve Man", "The Invaders" and "On Thursday We Leave for Home" all make use of Forbidden Planet's iconic saucer.
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