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Snark: The First Intercontinental Guided Missile ~ 1957 Northop
🕑 Added 2020-08-16 20:48:26 +0000 UTCmore at http://quickfound.net/
Originally a public domain film, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/SM-62_Snark
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
The Northrop SM-62 Snark was an early-model intercontinental range ground-launched cruise missile that could carry a W39 thermonuclear warhead. The Snark was deployed by the United States Air Force's Strategic Air Command from 1958 through 1961. It represented an important step in weapons technology during the Cold War. The Snark took its name from the author Lewis Carroll's character the "snark".
The Snark missile was developed to present a nuclear deterrent to the Soviet Union and other potential enemies at a time when Intercontinental ballistic missiles (ICBMs) were still in development. The Snark was the only surface-to-surface cruise missile with such a long range that was ever deployed by the U.S. Air Force. Following the deployment of ICBMs, the Snark was rendered obsolete, and it was removed from deployment in 1961...
Design and development
Work on the project began in 1946. Initially there were two missiles designed—a subsonic design (the MX775A Snark) and a supersonic design (the MX775B Boojum).(From the same poem: "The snark was a boojum, you see".) Budget reductions threatened the project in its first year, but the intervention of Air Force General Carl Spaatz and the industrialist Jack Northrop saved the project. Despite this, its funding by Congress was low, and this program was dogged by changes in specifications. The earliest planned due date in 1953 passed with the design still in development, and the Strategic Air Command was gradually becoming less supportive of it. In 1955, President Dwight D. Eisenhower ordered that top priority be assigned to ICBMs and their associated guided missile programs.
Despite considerable difficulties with the development of the Snark, and reservations from the Department of Defense towards it, the engineering work continued.
In 1957, tests of the Snark showed an estimated circular error probable (CEP) of 31 kilometres; 20 miles (17 nmi). By 1958, the celestial navigation system used by the Snark allowed its most accurate test, which appeared to fall 7.4 kilometres (4 nmi) short of the target... the design was notoriously unreliable, with the majority of tests suffering mechanical failure thousands of miles before reaching the target. Other factors, such as the reduction in operating altitude from 46,000 to 17,000 metres (150,000 to 55,000 ft), and the inability of the Snark to detect countermeasures and perform evasive maneuvers also made it a questionable strategic deterrent.
Technical description
The jet propelled 20.5 meter-long Snark missile had a top speed of about 1,050 kilometres per hour (650 mph) and a maximum range of about 10,200 kilometres (5,500 nmi). Its complicated celestial navigation system gave it a claimed CEP of about 2,400 metres (8,000 ft).
The Snark was an air-breathing missile, intended to be launched from a truck-mounted platform by two solid-fueled rocket booster engines. The Snark next switched to an internal turbojet engine for the rest of its flight. The engine was a Pratt and Whitney J57, which was the first jet engine featuring a thrust of 44,000 N (10,000 lbf) or more. Since the Snark lacked a horizontal tail surface, it used elevons as its primary flight control surfaces, and it flew with an unusual nose-high angle during level flight. During the final phase of its flight, its nuclear warhead would have separated from its fuselage and then followed a ballistic trajectory towards its target. Due to the abrupt shift in its center of gravity caused by separation, the fuselage would have performed an abrupt pitch-up maneuver in order to avoid a collision with the warhead.
One unusual capability of the Snark missile was its ability to fly away from its launch point for up to 11 hours, and then return for a landing. If its warhead did not detach from its body, then the Snark could be flown repeatedly. Lacking any landing gear, it would have been necessary for the Snark to skid to a stop on a flat, level surface. A runway at the Cape Canaveral Air Force Station is still known as the "Skid Strip"...
