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Amphibious Encyclopedia · Hovercraft and aircraft

Hovercraft

A hovercraft, or air-cushion vehicle, rides on a cushion of air that it blows beneath itself, which lets it travel over water, land, mud and ice [5]. British engineer Christopher Cockerell developed the practical form in the 1950s, and the Saunders-Roe SR.N1 made the first public flight of a full-size hovercraft in 1959 [2][3]. Because it can move from water onto land without stopping, the hovercraft is classed as an amphibious craft and has been used for ferries, rescue work and military landings [3][5][8].

  • Hovercraft and aircraft
  • 1959 to present
  • United Kingdom (origin); used worldwide

Invention

Christopher Cockerell, a British electronics engineer who had moved into boatbuilding, began looking in the 1950s for a way to reduce the drag of a hull pushing through water [2][3]. His best-known early experiment used a cat food tin set inside a coffee tin, a vacuum cleaner set to blow, and kitchen scales to measure the lift produced by air forced through the gap between the tins [2][3]. In 1955 he won backing from Britain's Ministry of Supply, and because of its possible military value the idea was placed on the government's secret list [3].

Saunders-Roe, an aircraft and marine engineering company at East Cowes on the Isle of Wight, carried out a feasibility study in 1957 [2]. In January 1958 Hovercraft Development Limited was formed with funding from the NRDC, a government development agency, and Cockerell became its technical director [2]. Saunders-Roe then built the first full-size craft, the SR.N1 (Saunders-Roe Nautical 1) [1][2].

The SR.N1 made its first public flight on 11 June 1959 at East Cowes, with chief test pilot Peter Lamb at the controls [1][2]. On 25 July 1959 it crossed the English Channel from Calais to Dover in just over two hours, with Lamb, Cockerell and a third crew member aboard [1][2]. Cockerell was knighted in 1969 for his contribution to British engineering [3]. The SR.N1 is preserved by the Science Museum Group at its Wroughton site in Wiltshire [2].

How a hovercraft works

A hovercraft blows a large volume of air underneath itself at slightly more than atmospheric pressure, and the trapped air lifts the hull clear of the surface [5]. Most craft hold the air in with a flexible skirt around the edge and use separate fans, propellers or ducted air for forward thrust and steering [5]. On the SR.N1, a single large fan drew air in through a central funnel; about two thirds of it formed the cushion and the rest left through side ducts to drive and steer the craft [2]. Flexible skirts, patented in 1962, later let hovercraft ride over larger waves and obstacles [2].

Because the cushion works over almost any fairly flat surface, a hovercraft can run from open water onto a beach, a ramp, mud or ice without changing mode, which is why it is counted as an amphibious vehicle [5][8]. British law reflects this. The Hovercraft Act 1968 defines a hovercraft by an air cushion whose boundaries include "the ground, water or other surface beneath the vehicle" [4]. The same act says that, unless a law provides otherwise, a hovercraft is not to be treated as a ship, an aircraft or a motor vehicle [4].

Cross-Channel and passenger services

Car-carrying SR.N4 hovercraft, built by the British Hovercraft Corporation, began cross-Channel service in 1968 [2][6]. Seaspeed opened its Dover to Boulogne route in August 1968, and Hoverlloyd also flew SR.N4s; the two operators merged in 1981 to form Hoverspeed [6]. The first SR.N4s carried about 250 passengers and 30 cars, and the lengthened Mk III up to 418 passengers and 60 cars, making the SR.N4 the largest civil hovercraft put into service [5][6]. A crossing took about 30 minutes, against about 90 minutes by conventional ferry [2]. The fastest crossing by a commercial car-carrying hovercraft, 22 minutes, was made by The Princess Anne on 14 September 1995 [6].

The last cross-Channel hovercraft service ran on 1 October 2000, after 32 years [5]. Sources point to competition from ferries, fast catamarans and the Channel Tunnel, the end of duty-free sales within the European Union, rising fuel costs and the age of the craft [2][5]. Six SR.N4s were built, and The Princess Anne is preserved at the Hovercraft Museum at Lee-on-the-Solent [6].

Smaller passenger hovercraft have had a longer run. Hovertravel began services between Ryde on the Isle of Wight and the mainland in 1965 with two 38-seat SR.N6 craft and still runs the Ryde to Southsea route [7]. Its two 12000TD craft, in service since 2016, each carry 78 passengers, and the crossing takes about 10 minutes [2][7]. The company describes itself as the world's longest-running hovercraft operator [7].

Military hovercraft

Armed forces use hovercraft to carry troops and vehicles from ships directly onto the shore. The US Navy's Landing Craft, Air Cushion (LCAC) grew out of test craft of the early 1970s; the first was delivered in 1984 [8]. It carries a payload of 60 tons, or 75 tons overloaded, enough for an M-1 tank, at more than 40 knots (46 mph, 74 km/h) when fully loaded [8]. Four gas turbines power its lift fans and two large reversible-pitch propellers [8]. The Navy has stated that air-cushion craft can reach more than 70 percent of the world's coastline, compared with about 15 percent for conventional landing craft [8].

The 91st and last LCAC was delivered in 2001 [8]. Japan's Maritime Self-Defense Force also operates the type, and a successor, the Ship-to-Shore Connector (LCAC-100), began entering US Navy service in 2019 [9]. The Soviet-designed Zubr class is described as the largest class of hovercraft ever built and remains in service with several navies [5].

Sources

  1. Hovercraft SR-N1, Science Museum Group Collection. collection.sciencemuseumgroup.org.uk/objects/co41524/hovercraft-sr-n1
  2. The Saunders-Roe Nautical 1: a game-changing hovercraft, Science Museum Group Blog (2024-06-11). blog.sciencemuseumgroup.org.uk/the-saunders-roe-nautical-1-a-game-changing-hovercraft
  3. 1959: First public flight by a full-sized hovercraft, Guinness World Records (2015-08-19). www.guinnessworldrecords.com/news/2015/8/60/1959-first-public-flight-by-a-full-sized-hovercraft-393014
  4. Hovercraft Act 1968, section 4, legislation.gov.uk (The National Archives). www.legislation.gov.uk/ukpga/1968/59/section/4
  5. Hovercraft, Wikipedia. en.wikipedia.org/wiki/Hovercraft
  6. SR.N4, Wikipedia. en.wikipedia.org/wiki/SR.N4
  7. Hovercraft History (Legacy of hovercraft innovation), Hovertravel. www.hovertravel.co.uk/legacy-of-hovercraft-innovation
  8. Navy Fact File: Landing Craft, Air Cushioned (archived copy), US Navy, archived by webharvest.gov (2004-10-16). webharvest.gov/peth04/20041016160604/http:/www.chinfo.navy.mil/navpalib/factfile/ships/ship-lcac.html
  9. Landing Craft Air Cushion, Wikipedia. en.wikipedia.org/wiki/Landing_Craft_Air_Cushion

Last reviewed November 2026. Spotted something to correct or add? Tell us and include a source.

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WaterCar has designed and built amphibious vehicles in Southern California for more than 25 years. We keep this encyclopedia so anyone curious about vehicles that cross between land and water has one place to start, with the sources listed for every fact.

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