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An 'observation wheel' is a large slowly rotating and vertically oriented nonbuilding structure carrying enclosed passenger cars or pods along its circumference. Although observation wheels are often described as Ferris wheels, the two differ in a number of significant respects:

★ Ferris wheels often have open cars or, in small wheels, individual bucket seats. An observation wheel has completely enclosed cars.

★ A Ferris wheel's passenger cars hang ''within'' the wheel's frame and are usually kept level by gravity. An observation wheel's cars are mounted on the ''outside'' of the frame and are stabilised mechanically.

★ A Ferris wheel is supported by two towers on each side of the axle. An observation wheel is supported by a single A-frame mounted on one side.
A famous observation wheel is the London Eye in London, UK, operated by The Tussauds Group. The eye is 443 feet (135 metres) tall. Its great popularity has led to a number of other cities, including Manchester, Birmingham and York (The Yorkshire Wheel), Moscow, Kuala Lumpur (Eye on Malaysia), Las Vegas, Shanghai, Melbourne and Singapore (Singapore Flyer) proposing to erect similar wheels. The proposed Birmingham wheel would perhaps be the most unusual, as it would be fixed in place while the pods would move around the circumference along a rail track.
As of June 2007, the world's tallest observation wheel is The Star of Nanchang, which is 162 meters high^[1]. Las Vegas and Singapore are competing to build the highest in the world, with the Singapore Flyer set to take over the title in February 2008. The Shanghai Star, initially planned as a 200 m (656 ft) tall wheel to be built by 2005, was revised to 170 m with a completion date set in 2007. It was cancelled in 2006 due to "political incorrectness". The plans to build a 600 ft wheel at the Rio in Las Vegas were cancelled in May 2004. Currently, developers are working on a deal to redesign the New Frontier including a 485 ft observation wheel, but construction is not expected to start until 2007.
The 120 m (394 ft) tall Southern Star Observation Wheel is under construction and expected to open in Melbourne in 2008.

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See also

References

See also

★ Ferris wheel

★ Las Vegas Voyager

★ London Eye

★ Singapore Flyer

References

1. http://www.boston.com/news/odd/articles/2006/05/02/china_claims_worlds_largest_ferris_wheel/