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A hovercraft or air-cushion vehicle (ACV) is a craft designed to travel over any smooth surface supported by a cushion of slow moving, high-pressure air, ejected downwards against the surface below, and contained within a "skirt." Hovercraft are used throughout the world as a method of specialized transport wherever there is the need to travel over multiple types of surfaces. Because they are supported by a cushion of air, hovercraft are unique among all forms of ground transportation in their ability to travel equally well over land, ice, and water. Small hovercraft are often used in physical activity, combustion, or passenger service, while giant hovercraft have been built for civilian and military applications to transport cars, tanks, and large equipment into difficult or hostile environments and terrain.

Today, often considered as the brainchild of Sir Christopher Cockerell, hovercraft are the result of a chain of developments from John Thornycroft's initial discovery in the late 1800s that air trapped beneath a ship's hull would reduce the friction imposed on the ship as it moved through water [1]. In the 1950s Sir Christopher Cockerell, a British engineer, discovered that by creating a wall of high pressure air forced beneath a hull, to create an air cushion, the hull (of the now Hovercraft) could be levitated furth

see

http://anggun3.wordpresstag/macbook/
http://en.wikipediawiki/Hovercraft
http://metacafewatch/567050/how_to_make_a_hovercraft/
http://youtubewatch?v=6Q7jul_QmW4
http://youtubewatch?v=zp9q_2uIk-M
http://xinventionsmain/hovercrafts/

In the world of crafts Air cushion vehicles (ACV) are fast catching up. Air cushion vehicle is a craft that travels on a layer of compressed air just above any kind of surface- land, water, ice etc. Their main area of applications are in military vehicles, helicopters and where transportation using wheeled or tracked vehicles are impossible. Air cushion vehicle (ACV) is a craft that travels on a layer of compressed air just above any kind of surface - land, water, ice, sand, mud etc. The compressed air serves as an invisible cushion that eliminates almost all friction between the vehicle and the surface. Air cushion vehicles are also known as Hovercraft. They can carry both passenger and freight. Some air cushion vehicles can travel as fast as 480 km per hour.In this seminar operations of ACV?s are reviewed.

Read the 700 page book 'On a Cushion of Air', (Amazon, The Book Depository, Kindle), which tells the story of Cockerell's discovery (heavy weights supported by low pressure air) and the development of the hovercraft from the early days to the heyday of the giant 165-ton SRN.4, which crossed the English Channel starting in 1968 carrying 30 cars and 254 passengers at speeds in excess of 75 knots. The service ended on 1st October 2000. Six SR.4s were built. See onacushionofair.com

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plz sent me de details of Hovercraft..so dat i can present it in my college as my final year seminars..plz do help me..

how much clearance between air cushion vehicle and surface which it move

http://seminarsprojects.net/Thread-Air-Cushion-Vehicles

read this also