Hovercraft

A hovercraft, also known as an air-cushion vehicle or ACV, is an amphibious craft capable of travelling over land, water, mud, ice, and other surfaces.

Hovercraft use blowers to produce a large volume of air below the hull (air cushion) that is slightly above atmospheric pressure. The pressure difference between the higher pressure air below the hull and lower pressure ambient air above it produces lift, which causes the hull to float above the running surface. For stability reasons, the air is typically blown through slots or holes around the outside of a disk- or oval-shaped platform, giving most hovercraft a characteristic rounded-rectangle shape. Typically this cushion is contained within a flexible "skirt", which allows the vehicle to travel over small obstructions without damage.

PA Griffon 2000TDX Mk II, 2006, deflated
A Lithuanian Coast Guard Griffon Hoverwork 2000TD hovercraft with engine off and skirt deflated
PA Griffon 2000TDX Mk II, 2006, inflated
The same hovercraft with engine on and skirt inflated

The first practical design for hovercraft was derived from a British invention in the 1950s to 1960s. They are now used throughout the world as specialised transports in disaster relief, coastguard, military and survey applications, as well as for sport or passenger service. Very large versions have been used to transport hundreds of people and vehicles across the English Channel, whilst others have military applications used to transport tanks, soldiers and large equipment in hostile environments and terrain.

Although now a generic term for the type of craft, the name Hovercraft itself was a trademark owned by Saunders-Roe (later British Hovercraft Corporation (BHC), then Westland), hence other manufacturers' use of alternative names to describe the vehicles.

Often referred to in the plural as 'Hovercrafts', the correct plural is 'Hovercraft' (in the same manner that 'aircraft' is both singular and plural). [1]

Formel1 hovercraft
A Formula 1 racing hovercraft
SRN4 Hovercraft Mountbatten Class
SR.N4 hovercraft arriving in Dover on its last commercial flight across the English Channel
USN hovercraft
U.S. Navy LCAC
DA-ST-87-01750.jpeg
A US Army LACV-30 (Lighter Air Cushion Vehicle - 30 Ton) hovercraft transports ground support equipment to shore in 1986

History

Early efforts

There have been many attempts to understand the principles of high air pressure below hulls and wings. Hovercraft are unique in that they can lift themselves while still, differing from ground effect vehicles and hydrofoils which require forward motion to create lift.

The first mention in the historical record of the concepts behind surface-effect vehicles that used the term hovering was by Swedish scientist Emanuel Swedenborg in 1716.[2]

The shipbuilder Sir John Isaac Thornycroft patented an early design for an air cushion ship / hovercraft in the 1870s, but suitable, powerful, engines were not available until the 20th century.[3]

In 1915, the Austrian Dagobert Müller von Thomamühl (1880–1956) built the world's first "air cushion" boat (Luftkissengleitboot). Shaped like a section of a large aerofoil (this creates a low pressure area above the wing much like an aircraft), the craft was propelled by four aero engines driving two submerged marine propellers, with a fifth engine that blew air under the front of the craft to increase the air pressure under it. Only when in motion could the craft trap air under the front, increasing lift. The vessel also required a depth of water to operate and could not transition to land or other surfaces. Designed as a fast torpedo boat, the Versuchsgleitboot had a top speed over 32 knots (59 km/h). It was thoroughly tested and even armed with torpedoes and machine guns for operation in the Adriatic. It never saw actual combat, however, and as the war progressed it was eventually scrapped due to the lack of interest and perceived need, and its engines returned to the air force.[4]

The theoretical grounds for motion over an air layer were constructed by Konstantin Eduardovich Tsiolkovskii in 1926 and 1927.[5][6]

In 1929, Andrew Kucher of Ford began experimenting with the "Levapad" concept, metal disks with pressurized air blown through a hole in the center. Levapads do not offer stability on their own. Several must be used together to support a load above them. Lacking a skirt, the pads had to remain very close to the running surface. He initially imagined these being used in place of casters and wheels in factories and warehouses, where the concrete floors offered the smoothness required for operation. By the 1950s, Ford showed a number of toy models of cars using the system, but mainly proposed its use as a replacement for wheels on trains, with the Levapads running close to the surface of existing rails.[7]

NJAHOF GlideMobile
Charles Fletcher's Glidemobile in the Aviation Hall of Fame and Museum of New Jersey

In 1931, Finnish aero engineer Toivo J. Kaario began designing a developed version of a vessel using an air cushion and built a prototype Pintaliitäjä (Surface Soarer), in 1937.[8] Kaario's design included the modern features of a lift engine blowing air into a flexible envelope for lift. Kaario never received funding to build his design, however. Kaario's efforts were followed closely in the Soviet Union by Vladimir Levkov, who returned to the solid-sided design of the Versuchsgleitboot. Levkov designed and built a number of similar craft during the 1930s, and his L-5 fast-attack boat reached 70 knots (130 km/h) in testing. However, the start of World War II put an end to Levkov's development work.[9][10]

During World War II, an American engineer, Charles Fletcher, invented a walled air cushion vehicle, the Glidemobile. Because the project was classified by the U.S. government, Fletcher could not file a patent.[11]

Christopher Cockerell

The idea of the modern hovercraft is most often associated with a British mechanical engineer Sir Christopher Cockerell. Cockerell's group was the first to develop the use of a ring of air for maintaining the cushion, the first to develop a successful skirt, and the first to demonstrate a practical vehicle in continued use.

Cockerell came across the key concept in his design when studying the ring of airflow when high-pressure air was blown into the annular area between two concentric tin cans (one coffee and the other from cat food) and a hair dryer. This produced a ring of airflow, as expected, but he noticed an unexpected benefit as well; the sheet of fast moving air presented a sort of physical barrier to the air on either side of it. This effect, which he called the "momentum curtain", could be used to trap high-pressure air in the area inside the curtain, producing a high-pressure plenum that earlier examples had to build up with considerably more airflow. In theory, only a small amount of active airflow would be needed to create lift and much less than a design that relied only on the momentum of the air to provide lift, like a helicopter. In terms of power, a hovercraft would only need between one quarter to one half of the power required by a helicopter.

Cockerell built several models of his hovercraft design in the early 1950s, featuring an engine mounted to blow from the front of the craft into a space below it, combining both lift and propulsion. He demonstrated the model flying over many Whitehall carpets in front of various government experts and ministers, and the design was subsequently put on the secret list. In spite of tireless efforts to arrange funding, no branch of the military was interested, as he later joked, "the navy said it was a plane not a boat; the air force said it was a boat not a plane; and the army was 'plain not interested.'"[12]

SR.N1

SRN1 General Arrangement
SR.N1 general arrangement

This lack of military interest meant that there was no reason to keep the concept secret, and it was declassified. Cockerell was finally able to convince the National Research Development Corporation to fund development of a full-scale model. In 1958, the NRDC placed a contract with Saunders-Roe for the development of what would become the SR.N1, short for "Saunders-Roe, Nautical 1".

The SR.N1 was powered by a 450 hp Alvis Leonides engine powering a vertical fan in the middle of the craft. In addition to providing the lift air, a portion of the airflow was bled off into two channels on either side of the craft, which could be directed to provide thrust. In normal operation this extra airflow was directed rearward for forward thrust, and blew over two large vertical rudders that provided directional control. For low-speed maneuverability, the extra thrust could be directed fore or aft, differentially for rotation.

The SR.N1 made its first hover on 11 June 1959, and made its famed successful crossing of the English Channel on 25 July 1959. In December 1959, the Duke of Edinburgh visited Saunders-Roe at East Cowes and persuaded the chief test-pilot, Commander Peter Lamb, to allow him to take over the SR.N1's controls. He flew the SR.N1 so fast that he was asked to slow down a little. On examination of the craft afterwards, it was found that she had been dished in the bow due to excessive speed, damage that was never allowed to be repaired, and was from then on affectionately referred to as the 'Royal Dent'.[13]

Skirts and other improvements

Testing quickly demonstrated that the idea of using a single engine to provide air for both the lift curtain and forward flight required too many trade-offs. A Blackburn Marboré turbojet for forward thrust and two large vertical rudders for directional control were added, producing the SR.N1 Mk II. A further upgrade with the Armstrong Siddeley Viper produced the Mk III. Further modifications, especially the addition of pointed nose and stern areas, produced the Mk IV.

Although the SR.N1 was successful as a testbed, the design hovered too close to the surface to be practical; at 9 inches (23 cm) even small waves would hit the bow. The solution was offered by Cecil Latimer-Needham, following a suggestion made by his business partner Arthur Ord-Hume. In 1958, he suggested the use of two rings of rubber to produce a double-walled extension of the vents in the lower fuselage. When air was blown into the space between the sheets it exited the bottom of the skirt in the same way it formerly exited the bottom of the fuselage, re-creating the same momentum curtain, but this time at some distance from the bottom of the craft.

Latimer-Needham and Cockerell devised a 4 feet (1.2 m) high skirt design, which was fitted to the SR.N1 to produce the Mk V,[14] displaying hugely improved performance, with the ability to climb over obstacles almost as high as the skirt. In October 1961, Latimer-Needham sold his skirt patents to Westland, who had recently taken over Saunders Roe's interest in the hovercraft.[15] Experiments with the skirt design demonstrated a problem; it was originally expected that pressure applied to the outside of the skirt would bend it inward, and the now-displaced airflow would cause it to pop back out. What actually happened is that the slight narrowing of the distance between the walls resulted in less airflow, which in turn led to more air loss under that section of the skirt. The fuselage above this area would drop due to the loss of lift at that point, and this led to further pressure on the skirt.

After considerable experimentation, Denys Bliss at Hovercraft Development Ltd. found the solution to this problem. Instead of using two separate rubber sheets to form the skirt, a single sheet of rubber was bent into a U shape to provide both sides, with slots cut into the bottom of the U forming the annular vent. When deforming pressure was applied to the outside of this design, air pressure in the rest of the skirt forced the inner wall to move in as well, keeping the channel open. Although there was some deformation of the curtain, the airflow within the skirt was maintained and the lift remained relatively steady. Over time, this design evolved into individual extensions over the bottom of the slots in the skirt, known as "fingers".

Hovercraft-MVPP10
Passenger-carrying hovercraft, offshore from Ōita Airport in Japan

Commercialization

Through these improvements, the hovercraft became an effective transport system for high-speed service on water and land, leading to widespread developments for military vehicles, search and rescue, and commercial operations. By 1962, many UK aviation and ship building firms were working on hovercraft designs, including Saunders Roe/Westland, Vickers-Armstrong, William Denny, Britten-Norman and Folland.[16] Small-scale ferry service started as early as 1962 with the launch of the Vickers-Armstrong VA-3. With the introduction of the 254 passenger and 30 car carrying SR.N4 cross-channel ferry by Hoverlloyd and Seaspeed in 1968, hovercraft had developed into useful commercial craft.

Hovercraft in the Netherlands, newsreel from 1976

Another major pioneering effort of the early hovercraft era was carried out by Jean Bertin's firm in France. Bertin was an advocate of the "multi-skirt" approach, which used a number of smaller cylindrical skirts instead of one large one in order to avoid the problems noted above. During the early 1960s he developed a series of prototype designs, which he called "terraplanes" if they were aimed for land use, and "naviplanes" for water. The best known of these designs was the N500 Naviplane, built for Seaspeed by the Société d'Etude et de Développement des Aéroglisseurs Marins (SEDAM). The N500 could carry 400 passengers, 55 cars and five buses. It set a speed record between Boulogne and Dover of 74 kn (137 km/h). It was rejected by its operators, who claimed that it was unreliable.[17]

Hivus-48 hovercraft working at Nizhniy Novgorod-Bor crossing
Russian-built Aerohod A48 hovercraft with passengers

Another discovery was that the total amount of air needed to lift the craft was a function of the roughness of the surface it travelled over. On flat surfaces, like pavement, the needed air pressure was so low that hovercraft were able to compete in energy terms with conventional systems like steel wheels. However, as the hovercraft lift system acted as both a lift and very effective suspension, it naturally lent itself to high-speed use where conventional suspension systems were considered too complex. This led to a variety of "hovertrain" proposals during the 1960s, including England's Tracked Hovercraft and France's Aérotrain. In the U.S., Rohr Inc. and Garrett both took out licenses to develop local versions of the Aérotrain. These designs competed with maglev systems in the high-speed arena, where their primary advantage was the very "low tech" tracks they needed. On the downside, the air blowing dirt and trash out from under the trains presented a unique problem in stations, and interest in them waned in the 1970s.

Hovercraft - scheme
  1. Propellers
  2. Air
  3. Fan
  4. Flexible skirt

By the early 1970s, the basic concept had been well developed, and the hovercraft had found a number of niche roles where its combination of features were advantageous. Today, they are found primarily in military use for amphibious operations, search and rescue vehicles in shallow water, and sporting vehicles.

Design

Hovercraft can be powered by one or more engines. Small craft, such as the SR.N6, usually have one engine with the drive split through a gearbox. On vehicles with several engines, one usually drives the fan (or impeller), which is responsible for lifting the vehicle by forcing high pressure air under the craft. The air inflates the "skirt" under the vehicle, causing it to rise above the surface. Additional engines provide thrust in order to propel the craft. Some hovercraft use ducting to allow one engine to perform both tasks by directing some of the air to the skirt, the rest of the air passing out of the back to push the craft forward.

Uses

Commercial

The British aircraft and marine engineering company Saunders-Roe built the first practical human-carrying hovercraft for the National Research Development Corporation, the SR.N1, which carried out several test programmes in 1959 to 1961 (the first public demonstration was in 1959), including a cross-channel test run in July 1959, piloted by Peter "Sheepy" Lamb, an ex-naval test pilot and the chief test pilot at Saunders Roe. Christopher Cockerell was on board, and the flight took place on the 50th anniversary of Louis Blériot's first aerial crossing.[18]

The SR.N1 was powered by a single piston engine, driven by expelled air. Demonstrated at the Farnborough Airshow in 1960,[18] it was shown that this simple craft can carry a load of up to 12 marines with their equipment as well as the pilot and co-pilot with only a slight reduction in hover height proportional to the load carried. The SR.N1 did not have any skirt, using instead the peripheral air principle that Christopher had patented. It was later found that the craft's hover height was improved by the addition of a skirt of flexible fabric or rubber around the hovering surface to contain the air. The skirt was an independent invention made by a Royal Navy officer, C.H. Latimer-Needham, who sold his idea to Westland (by then the parent of Saunders-Roe's helicopter and hovercraft interests), and who worked with Christopher to develop the idea further.

The first passenger-carrying hovercraft to enter service was the Vickers VA-3, which, in the summer of 1962, carried passengers regularly along the north Wales coast from Moreton, Merseyside, to Rhyl. It was powered by two turboprop aero-engines and driven by propellers.[19]

RNLI Hovercraft H-001 2005-07-16
In Britain, the RNLI operate a small fleet of hovercraft lifeboats
Hovercraft leaving Ryde
The Hovertravel service uses Griffon Hoverwork BHT130 between the Isle of Wight and mainland England, as of 2018, is the only public hovercraft service in the United Kingdom

During the 1960s, Saunders-Roe developed several larger designs that could carry passengers, including the SR.N2, which operated across the Solent, in 1962, and later the SR.N6, which operated across the Solent from Southsea to Ryde on the Isle of Wight for many years. In 1963 the, SR.N2 was used in experimental service between Weston-super-Mare and Penarth under the aegis of P & A Campbell, the paddle steamer operators.

Operations by Hovertravel commenced on 24 July 1965, using the SR.N6, which carried 38 passengers.[18] Two 98 seat AP1-88 hovercraft were introduced on this route in 1983, and in 2007, these were joined by the first 130-seat BHT130 craft. The AP1-88 and the BHT130 were notable as they were largely built by Hoverwork using shipbuilding techniques and materials (i.e. welded aluminium structure and diesel engines) rather than the aircraft techniques used to build the earlier craft built by Saunders-Roe-British Hovercraft Corporation. Over 20 million passengers had used the service as of 2004 – the service is still operating (as of 2018) and is by far the longest, continuously operated hovercraft service.

In 1966, two cross-channel passenger hovercraft services were inaugurated using SR.N6 hovercraft. Hoverlloyd ran services from Ramsgate Harbour, England, to Calais, France, and Townsend Ferries also started a service to Calais from Dover, which was soon superseded by that of Seaspeed.

As well as Saunders-Roe and Vickers (which combined in 1966 to form the British Hovercraft Corporation (BHC)), other commercial craft were developed during the 1960s in the UK by Cushioncraft (part of the Britten-Norman Group) and Hovermarine based at Woolston (the latter being sidewall hovercraft, where the sides of the hull projected down into the water to trap the cushion of air with normal hovercraft skirts at the bow and stern). One of these models, the HM-2, was used by Red Funnel between Southampton (near the Woolston Floating Bridge) and Cowes.[20]

Hoverlloyd hovercraft on an English Channel beach, 1973
The Hoverlloyd SR.N4 craft Swift GH-2004 on the pad at Pegwell Bay Hoverport, 1973

The world's first car-carrying hovercraft was made in 1968, the BHC Mountbatten class (SR.N4) models, each powered by four Bristol Proteus turboshaft engines. These were both used by rival operators Hoverlloyd and Seaspeed (joined to form Hoverspeed in 1981) to operate regular car and passenger carrying services across the English Channel. Hoverlloyd operated from Ramsgate, where a special hoverport had been built at Pegwell Bay, to Calais. Seaspeed operated from Dover, England, to Calais and Boulogne in France. The first SR.N4 had a capacity of 254 passengers and 30 cars, and a top speed of 83 kn (154 km/h). The channel crossing took around 30 minutes and was run like an airline with flight numbers. The later SR.N4 Mk.III had a capacity of 418 passengers and 60 cars. These were later joined by the French-built SEDAM N500 Naviplane with a capacity of 385 passengers and 45 cars; only one entered service and was used intermittently for a few years on the cross-channel service until returned to SNCF in 1983. The service ceased on 1 October 2000 after 32 years, due to competition with traditional ferries, catamaran, the disappearance of duty-free shopping within the EU, the advancing age of the SR.N4 hovercraft and the opening of the Channel Tunnel.[21]

The commercial success of hovercraft suffered from rapid rises in fuel prices during the late 1960s and 1970s, following conflict in the Middle East. Alternative over-water vehicles, such as wave-piercing catamarans (marketed as the SeaCat in the UK until 2005), use less fuel and can perform most of the hovercraft's marine tasks. Although developed elsewhere in the world for both civil and military purposes, except for the Solent Ryde to Southsea crossing, hovercraft disappeared from the coastline of Britain until a range of Griffon Hovercraft were bought by the Royal National Lifeboat Institution.

Hovercraft feuerwehr steinberg 09012009
A volunteer fire department in Bavaria using a hovercraft to practise a rescue

Hovercraft used to ply between the Gateway of India in Mumbai and CBD Belapur and Vashi in Navi Mumbai between 1994 and 1999, but the services were subsequently stopped due to the lack of sufficient water transport infrastructure.[22]

Civilian non-commercial

In Finland, small hovercraft are widely used in maritime rescue and during the rasputitsa ("mud season") as archipelago liaison vehicles. In England, hovercraft of the Burnham-on-Sea Area Rescue Boat (BARB) are used to rescue people from thick mud in Bridgwater Bay. Avon Fire and Rescue Service became the first Local Authority fire service in the UK to operate a hovercraft. It is used to rescue people from thick mud in the Weston-super-Mare area and during times of inland flooding. A Griffon rescue Hovercraft has been in use for a number of years with the Airport Fire Service at Dundee Airport in Scotland. It is used in the event of an aircraft ditching in the Tay estuary. Numerous fire departments around the US/Canadian Great Lakes operate hovercraft for water and ice rescues, often of ice fisherman stranded when ice breaks off from shore. The Canadian Coast Guard uses hovercraft to break light ice.[23][24]

Caiman hovercraft
Civilian Caiman-10 hovercraft for fishing and hunting

In October 2008, The Red Cross commenced a flood-rescue service hovercraft based in Inverness, Scotland.[25] Gloucestershire Fire and Rescue Service received two flood-rescue hovercraft donated by Severn Trent Water following the 2007 UK floods.[26]

Since 2006, hovercraft have been used in aid in Madagascar by HoverAid, an international NGO who use the hovercraft to reach the most remote places on the island.[27]

MarshalHovercraft
Modern hovercraft "Marshal"

The Scandinavian airline SAS used to charter an AP1-88 hovercraft for regular passengers between Copenhagen Airport, Denmark, and the SAS Hovercraft Terminal in Malmö, Sweden.

In 1998, the US Postal Service began using the British built Hoverwork AP1-88 to haul mail, freight, and passengers from Bethel, Alaska, to and from eight small villages along the Kuskokwim River. Bethel is far removed from the Alaska road system, thus making the hovercraft an attractive alternative to the air based delivery methods used prior to introduction of the hovercraft service. Hovercraft service is suspended for several weeks each year while the river is beginning to freeze to minimize damage to the river ice surface. The hovercraft is able to operate during the freeze-up period; however, this could potentially break the ice and create hazards for villagers using their snowmobiles along the river during the early winter.

СВП Хивус-10 на Таймыре
Hivus-10 hovercraft on Taimyr peninsula in April 2013

In 2006, Kvichak Marine Industries of Seattle, US built, under license, a cargo/passenger version of the Hoverwork BHT130. Designated 'Suna-X', it is used as a high speed ferry for up to 47 passengers and 47,500 pounds (21,500 kg) of freight serving the remote Alaskan villages of King Cove and Cold Bay.

An experimental service was operated in Scotland across the Firth of Forth (between Kirkcaldy and Portobello, Edinburgh), from 16 to 28 July 2007. Marketed as Forthfast, the service used a craft chartered from Hovertravel and achieved an 85% passenger load factor. As of 2009, the possibility of establishing a permanent service is still under consideration.[28]

Since the channel routes abandoned hovercraft, and pending any reintroduction on the Scottish route, the United Kingdom's only public hovercraft service is that operated by Hovertravel between Southsea (Portsmouth) and Ryde on the Isle of Wight.

From the 1960s, several commercial lines were operated in Japan, without much success. In Japan the last commercial line had linked Ōita Airport and central Ōita but was shut down in October 2009.

LCAC 19970620
A U.S. Navy Landing Craft Air Cushion, an example of a military hovercraft
Zapad-2009 military exercises
A Russian navy Landing Craft Zubr class, an example of a large armed military hovercraft

Hovercraft are still manufactured in the UK, near to where they were first conceived and tested, on the Isle of Wight. They can also be chartered for a wide variety of uses including inspections of shallow bed offshore wind farms and VIP or passenger use. A typical vessel would be a Tiger IV or a Griffon. They are light, fast, road transportable and very adaptable with the unique feature of minimising damage to environments.

Military

First applications of the hovercraft in military use was with the SR.N1 through SR.N6 craft built by Saunders-Roe in the Isle of Wight in the UK and used by the UK joint forces. To test the use of the hovercraft in military applications the UK set up the Interservice Hovercraft Trials Unit (IHTU) base at Lee-on-the-Solent (now the site of the Hovercraft Museum). This unit carried out trials on the SR.N1 from Mk1 through Mk5 as well as testing the SR.N2, SR.N3, SR.N5 and SR.N6 craft. Currently, the Royal Marines use the Griffonhoverwork 2400TD hovercraft, the replacement for the Griffon 2000 TDX Class ACV as a tactical craft. The 2000 was deployed by the UK in Iraq.

The hovercraft's inventor, Sir Christopher Cockerell, claimed late in his life that the Falklands War could have been won far more easily had the British military shown more interest in hovercraft.[29]

South Vietnam....A U.S. Navy patrol air cushion vehicle (PACV) glides over the waters of Cau Hai Bay near Hue. - NARA - 558515
A U.S. patrol air cushion vehicle (PACV) in Cau Hai Bay near Hue South Vietnam 1968.

In the US, during the 1960s, Bell licensed and sold the Saunders-Roe SR.N5 as the Bell SK-5. They were deployed on trial to the Vietnam War by the United States Navy as PACV patrol craft in the Mekong Delta where their mobility and speed was unique. This was used in both the UK SR.N5 curved deck configuration and later with modified flat deck, gun turret and grenade launcher designated the 9255 PACV. The United States Army also experimented with the use of SR.N5 hovercraft in Vietnam. Three hovercraft with the flat deck configuration were deployed to Đồng Tâm in the Mekong Delta region and later to Ben Luc. They saw action primarily in the Plain of Reeds. One was destroyed in early 1970 and another in August of that same year, after which the unit was disbanded. The only remaining U.S. Army SR.N5 hovercraft is currently on display in the Army Transport Museum in Virginia. Experience led to the proposed Bell SK-10, which was the basis for the LCAC-class air-cushioned landing craft now deployed by the U.S. and Japanese Navy. Developed and tested in the mid-1970s, the LACV-30 was used by the US Army to transport military cargo in logistics-over-the-shore operations from the early 1980s thru the mid 1990s.[30]

The Soviet Union was the world's largest developer of military hovercraft. Their designs range from the small Czilim class ACV, comparable to the SR.N6, to the monstrous Zubr class LCAC, the world's largest hovercraft. The Soviet Union was also one of the first nations to use a hovercraft, the Bora, as a guided missile corvette, though this craft possessed rigid, non-inflatable sides. With the fall of the Soviet Union, most Soviet military hovercraft fell into disuse and disrepair. Only recently has the modern Russian Navy begun building new classes of military hovercraft.

The Iranian Navy operates multiple British made[31][32] and some Iranian produced hovercraft.[33][34][35] The Tondar or Thunderbolt comes in varieties designed for combat and transportation. Iran has equipped the Tondar with mid-range missiles, machine guns and retrievable reconnaissance drones. Currently they are used for water patrols and combat against drug smugglers.

The Finnish Navy designed an experimental missile attack hovercraft class, Tuuli class hovercraft, in the late 1990s. The prototype of the class, Tuuli, was commissioned in 2000. It proved an extremely successful design for a littoral fast attack craft, but due to fiscal reasons and doctrinal change in the Navy, the hovercraft was soon withdrawn.

The People's Army Navy of China operates the Jingsah II class LCAC. This troop and equipment carrying hovercraft is roughly the Chinese equivalent of the U.S. Navy LCAC.

Recreational/sport

Small commercially manufactured, kit or plan-built hovercraft are increasingly being used for recreational purposes, such as inland racing and cruising on inland lakes and rivers, marshy areas, estuaries and inshore coastal waters.[36]

The Hovercraft Cruising Club[37] supports the use of hovercraft for cruising in coastal and inland waterways, lakes and lochs.

The Hovercraft Club of Great Britain, founded in 1966, regularly organizes inland and coastal hovercraft race events at various venues across the United Kingdom.[38]

Onemanhovercrafts
Single seater racing hovercraft

In August 2010, the Hovercraft Club of Great Britain hosted the World Hovercraft Championships at Towcester Racecourse[39] The World Hovercraft Championships are run under the auspices of the World Hovercraft Federation.[40] Similar events are also held in Europe and the US.[41][42]

Apart from the craft designed as "racing hovercraft", which are often only suitable for racing, there is another form of small personal hovercraft for leisure use, often referred to as cruising hovercraft, capable of carrying up to four people. Just like their full size counterparts, the ability of these small personal hovercraft to safely cross all types of terrain, (e.g. water, sandbanks, swamps, ice, etc.) and reach places often inaccessible by any other type of craft, makes them suitable for a number of roles, such as survey work and patrol and rescue duties in addition to personal leisure use. Increasingly, these craft are being used as yacht tenders, enabling yacht owners and guests to travel from a waiting yacht to, for example, a secluded beach. In this role, small hovercraft can offer a more entertaining alternative to the usual small boat and can be a rival for the jet-ski. The excitement of a personal hovercraft can now be enjoyed at "experience days", which are popular with families, friends and those in business, who often see them as team building exercises. This level of interest has naturally led to a hovercraft rental sector and numerous manufacturers of small, ready built designs of personal hovercraft to serve the need.[43]

Other uses

Hoverbarge

A real benefit of air cushion vehicles in moving heavy loads over difficult terrain, such as swamps, was overlooked by the excitement of the British Government funding to develop high-speed hovercraft. It was not until the early 1970s that the technology was used for moving a modular marine barge with a dragline on board for use over soft reclaimed land.

Mackace (Mackley Air Cushion Equipment), now known as Hovertrans, produced a number of successful Hoverbarges, such as the 250 ton payload "Sea Pearl", which operated in Abu Dhabi, and the twin 160 ton payload "Yukon Princesses", which ferried trucks across the Yukon River to aid the pipeline build. Hoverbarges are still in operation today. In 2006, Hovertrans (formed by the original managers of Mackace) launched a 330-ton payload drilling barge in the swamps of Suriname.[44]

The Hoverbarge technology is somewhat different from high-speed hovercraft, which has traditionally been constructed using aircraft technology. The initial concept of the air cushion barge has always been to provide a low-tech amphibious solution for accessing construction sites using typical equipment found in this area, such as diesel engines, ventilating fans, winches and marine equipment. The load to move a 200 ton payload ACV barge at 5 kn (9.3 km/h) would only be 5 tons. The skirt and air distribution design on high-speed craft again is more complex, as they have to cope with the air cushion being washed out by a wave and wave impact. The slow speed and large mono chamber of the hover barge actually helps reduce the effect of wave action, giving a very smooth ride.

The low pull force enabled a Boeing 107 helicopter to pull a hoverbarge across snow, ice and water in 1982.[45][46]

Hovertrains

Several attempts have been made to adopt air cushion technology for use in fixed track systems, in order to utilize the lower frictional forces for delivering high speeds. The most advanced example of this was the Aérotrain, an experimental high speed hovertrain built and operated in France between 1965 and 1977. The project was abandoned in 1977 due to lack of funding, the death of its lead engineer and the adoption of the TGV by the French government as its high-speed ground transport solution.

A test track for a tracked hovercraft system was built at Earith near Cambridge, England. It ran southwest from Sutton Gault, sandwiched between the Old Bedford River and the smaller Counter Drain to the west. Careful examination of the site will still reveal traces of the concrete piers used to support the structure. The actual vehicle, RTV31, is preserved at Railworld in Peterborough[47] and can be seen from trains, just south west of Peterborough railway station. The vehicle achieved 104 mph (167 km/h) on 7 February 1973[48] but the project was cancelled a week later. The project was managed by Tracked Hovercraft Ltd., with Denys Bliss as Director in the early 1970s, then axed by the Aerospace Minister, Michael Heseltine. Records of this project are available from the correspondence and papers of Sir Harry Legge-Bourke, MP at Leeds University Library.[49] Heseltine was accused by Airey Neave and others of misleading the House of Commons when he stated that the government was still considering giving financial support to the Hovertrain, when the decision to pull the plug had already been taken by the Cabinet.

After the Cambridge project was abandoned due to financial constraints, parts of the project were picked up by the engineering firm Alfred McAlpine, and abandoned in the mid-1980s. The Tracked Hovercraft project and Professor Laithwaite's Maglev train system were contemporaneous, and there was intense competition between the two prospective British systems for funding and credibility.

At the other end of the speed spectrum, the Dorfbahn Serfaus has been in continuous operation since 1985. This is an unusual underground air cushion funicular rapid transit system, situated in the Austrian ski resort of Serfaus. Only 1,280 m (4,200 ft) long, the line reaches a maximum speed of 25 mph (40 km/h). A similar system also exists in Narita International Airport near Tokyo, Japan.

In the late 1960s and early 1970s, the U.S. Department of Transport's Urban Mass Transit Administration funded several hovertrain projects, which were known as Tracked Air Cushion Vehicles or TACVs. They were also known as Aerotrains since one of the builders had a licence from Bertin's Aerotrain company. Three separate projects were funded. Research and development was carried out by Rohr, Inc., Garrett AiResearch and Grumman. The UMTA built an extensive test site in Pueblo, Colorado, with different types of tracks for the different technologies used by the prototype contractors. They managed to build prototypes and do a few test runs before the funding was cut.

Non-transportation

The Hoover Constellation was a spherical canister-type vacuum cleaner notable for its lack of wheels. Floating on a cushion of air, it was a domestic hovercraft. They were not especially good as vacuum cleaners as the air escaping from under the cushion blew uncollected dust in all directions, nor as hovercraft as their lack of a skirt meant that they only hovered effectively over a smooth surface. Despite this, original Constellations are sought-after collectibles today.

The Flymo is an air-cushion lawn mower that uses a fan on the cutter blade to provide lift. This allows it to be moved in any direction, and provides double-duty as a mulcher.

The Marylebone Cricket Club owns a "hover cover" that it uses regularly to cover the pitch at Lord's Cricket Ground. This device is easy and quick to move, and has no pressure points, making damage to the pitch less likely. The system is quite popular at major pitches in the UK.

Preservation

Lee-on-the-Solent, Hampshire, England, is the home of the Hovercraft Museum, which houses the world's largest collection of hovercraft designs, including some of the earliest and largest. Much of the collection is housed within the retired SR.N4 hovercraft Princess Anne. She is the last of her kind in the world. There are many hovercraft in the museum but all are non-operational.

Hovercraft are still in use between Ryde on the Isle of Wight and Southsea on the mainland. The service, operated by Hovertravel, schedules up to three crossings each hour, and is the fastest way of getting on or off the island. Large passenger hovercraft are still manufactured on the Isle of Wight.

Records

Hovercraft, Petone, Wellington 15 July 2005
Hovercraft parked on foreshore in Wellington, New Zealand
  • World's Largest Civil Hovercraft[50] - The BHC SR.N4 Mk.III, at 56.4 m (185 ft) length and 310 metric tons (305 long tons) weight, can accommodate 418 passengers and 60 cars.
  • World's largest military hovercraft - The Russian Zubr class LCAC at 57.6 meters (188 feet) length and a maximum displacement of 535 tons. This hovercraft can transport three T-80 main battle tanks (MBT), 140 fully equipped troops, or up to 130 tons of cargo. Four have been purchased by the Greek Navy.
  • English Channel crossing - 22 minutes by Princess Anne Mountbatten class hovercraft SR.N4 Mk.III on 14 September 1995
  • World Hovercraft Speed Record[51] - 137.4 km/h (85.38 mph or 74.19 knots). Bob Windt (USA) at World Hovercraft Championships, Rio Douro River, Peso de Regua, Portugal on 18 September 1995.
  • Hovercraft land speed record[52] - 56.25 mph (90.53 km/h or 48.88 knots). John Alford (USA) at Bonneville Salt Flats, Utah, USA on 21 September 1998.
  • Longest continuous use - The original prototype SR.N6 Mk.I (009) was in service for over 20 years, and logged a remarkable 22,000 hours of use. It is currently on display at the Hovercraft Museum in Lee-on-the-Solent, Hampshire, England.

See also

References

Notes

  1. ^ Hovercraft Definition and Meaning, collinsdictionary.com, retrieved 2019-07-02
  2. ^ "House of Commons Debates: Hovercraft Bill", Hansard, Hansard.millbanksystems.com, 764, cc1479-522, 1968-05-16, archived from the original on 2012-11-27, retrieved 2012-05-26
  3. ^ "BBC ON THIS DAY - 11 - 1959: Hovercraft marks new era in transport". BBC. Archived from the original on 2008-01-06. Retrieved 2007-07-10.
  4. ^ "Technic - Austro-Hungarian Hovercraft - The Development". Homepages.fh-giessen.de. 1915-03-26. Archived from the original on 2007-10-09. Retrieved 2012-05-26.
  5. ^ Tsiolkovskii, Konstantin, Friction and resistance of air (in Russian), personal archive published by the Russian Academy of Sciences (in author's own handwriting, pp. 55 and 56
  6. ^ ""Russia and the Ground-effect Vehicle". Flight International. 1962-04-05. Archived from the original on 2015-10-05. Retrieved 2015-10-05.
  7. ^ "Cars that Fly" Archived 2016-01-29 at the Wayback Machine, Modern Mechanix, October 1959, pp. 91-95
  8. ^ "TamPub" (PDF). uta.fi. Archived (PDF) from the original on 2012-03-26. Retrieved 2010-01-22.
  9. ^ "Судно на воздушной подушке" [Hovercraft] (in Russian). Great Soviet Encyclopedia. Archived from the original on 2011-08-14. Retrieved 2013-05-06.
  10. ^ Первый боевой корабль на воздушной подушке, советский торпедный катер Л-5 [The first air-cushion warship, the Soviet torpedo boat L-5]. 1940. Archived from the original on 2019-05-10. Retrieved 2017-11-17 – via YouTube.
  11. ^ Inventor of the week: Christopher Cockerell, MIT, August 2007, archived from the original on 2012-06-13, retrieved 2012-04-24
  12. ^ "Air apparent", Maritime Defence Management Journal, Issue 47
  13. ^ Raymond Wheeler, "From River to Sea", Cross Publishing, 1993
  14. ^ Bill Gunston, "Hydrofoils and Hovercraft: new vehicles for sea and land", Doubleday, 1969, p.93
  15. ^ as part of consolidation of British helicopter activities by several aero companies into one
  16. ^ "Hovercraft: New Generations Ahead". Flight International: 528. 1961-10-05. Archived from the original on 2012-06-22. Retrieved 2010-01-13.
  17. ^ "Aérotrain et Naviplanes - L'histoire de la SEDAM et des Naviplanes". Aérotrain et Naviplanes. Archived from the original on 2011-09-27. Retrieved 2006-07-28.
  18. ^ a b c Lefeaux, John (2001). Whatever Happened to the Hovercraft?. Pentland Books. ISBN 1-85821-850-0.
  19. ^ "Hoylake-Rhyl Hovercraft Service". Archived from the original on 2014-02-01. Retrieved 2013-02-08.
  20. ^ "Hovercraft of Hovermarine Transport Ltd". Bartiesworld.co.uk. 1974-12-18. Archived from the original on 2012-05-29. Retrieved 2012-05-26.
  21. ^ Young, Robin (2000-10-02). "Fans mourn last hovercraft crossing". The Times. UK. p. 6.
  22. ^ "Navi Mumbai mulls hovercraft services". Sify. Navi Mumbai. 2011-11-03. Archived from the original on 2015-09-24. Retrieved 2015-01-03.
  23. ^ "CCGS Mamilossa". Archived from the original on 2015-12-08. Retrieved 2015-12-04.
  24. ^ "CCGS Sipu Muin". Archived from the original on 2015-12-08. Retrieved 2015-12-04.
  25. ^ "SVCO".
  26. ^ "County lends Cumbria hovercraft". BBC News. 2009-11-20. Retrieved 2010-05-04.
  27. ^ "hoveraid.org - Home". hoveraid.org. Archived from the original on 2014-02-13. Retrieved 2014-02-10.
  28. ^ "Forthfast". Stagecoach Bus. Archived from the original on 2009-10-02. Retrieved 2009-09-12.
  29. ^ Margolis, Jonathan (1995-12-10). "Hover bother on the horizon". The Sunday Times.
  30. ^ John Pike. "Lighter Air Cushioned Vehicle 30-ton (LACV 30)". globalsecurity.org. Archived from the original on 2016-09-21. Retrieved 2016-05-22.
  31. ^ "LCAC / PGAC Wellington BH.7 (Iran) class". harpoondatabases.com. Archived from the original on 2014-02-22. Retrieved 2014-02-10.
  32. ^ John Pike. "Iranian Warships". globalsecurity.org. Archived from the original on 2014-04-06. Retrieved 2014-02-10.
  33. ^ "Iran unveils home-made missile launching hovercraft - NZweek". nzweek.com. Archived from the original on 2014-02-23. Retrieved 2014-02-10.
  34. ^ english.farsnews.com/newstext.php?nn=8803051171
  35. ^ "Media/images/1388/03/06/100907865558". jamejamonline.ir. Archived from the original on 2014-03-06. Retrieved 2014-02-10.
  36. ^ "Welcome to the Hovercruiser Web site". hovercruiser.org.uk. 2008. Archived from the original on 2010-02-03. Retrieved 2009-10-24.
  37. ^ "Hovercraft Cruising Club UK !". Archived from the original on 2018-12-27. Retrieved 2019-05-17.
  38. ^ "Hovercraft Club of Great Britain". Archived from the original on 2009-09-25. Retrieved 2009-10-24.
  39. ^ "World Hovercraft Championships". 2010. Archived from the original on 2010-05-03. Retrieved 2010-05-16.
  40. ^ "World Hovercraft Federation". 2011. Archived from the original on 2015-02-17. Retrieved 2019-05-17.
  41. ^ "European Hovercraft Federation". 2011. Archived from the original on 2011-07-04. Retrieved 2011-06-23.
  42. ^ "Hoverclub of America". 2011. Archived from the original on 2011-06-28. Retrieved 2011-06-23.
  43. ^ "RC Hovercraft". hovercrafthq.com. Archived from the original on 2014-12-17. Retrieved 2014-12-10.
  44. ^ "History of the Hoverbarge". HoverTrans
  45. ^ "Happy birthday to Columbia Helicopters! Oregon-based company celebrates its 50th anniversary". Vertical. 2007-04-18. Retrieved 2012-08-24.
  46. ^ "The hover barge". Columbia Helicopters. Archived from the original on 2016-02-13. Retrieved 2012-08-24.
  47. ^ "Hover Trains". Railworld. Archived from the original on 2007-09-10. Retrieved 2009-09-12.
  48. ^ "*** MISSING TITLE *** MISSING TITLE ***", The Railway Magazine, p. 235, May 1973
  49. ^ "Correspondence and papers of Sir Harry Legge-Bourke, MP" (PDF). University of Leeds. 2004-06-02. Archived (PDF) from the original on 2009-03-27. Retrieved 2009-10-14.
  50. ^ "Largest Hovercraft". Guinness World Records. Archived from the original on 2006-05-25. Retrieved 2006-07-18.
  51. ^ "Guinness World Records - Fastest Hovercraft". Archived from the original on 2014-11-03. Retrieved 2014-11-02.
  52. ^ "Fastest speed on land for a hovercraft". Archived from the original on 2014-11-03. Retrieved 2014-11-02.

Bibliography

External links

Air-cushioned landing craft

An air-cushioned landing craft, also called an LCAC (landing craft, air cushioned) is a modern variation on the amphibious landing boat. The majority of these craft are small- to mid-sized multi-purpose hovercraft, also known as "over the beach" ("OTB") craft. This allows troops and material to access more than 70 percent of the world's coastline, while only approximately 15 percent of that coastline is available to conventional boat-type landing craft. Typical barriers to conventional landing craft are soft sandy beaches, marshes, swampland, and loose surfaces. Air cushion technology has vastly increased the landing capability of the craft, providing greater speed and flexibility over traditional landing craft.

Like the mechanized landing craft, they are usually equipped with mounted machine guns; they also support grenade launchers and heavy weapons.

Bora-class hovercraft

The Bora-class hoverborne guided missile corvette of the Russian Navy, also bears the NATO class name Dergach, is one of the few types of military surface effect ship built solely for marine combat purposes, rather than troop landing or transport. Its designation in the Soviet and Russian navies is Project 1239; the first vessel produced under this designation was Sivuch, which was later renamed Bora. It is one of the largest combat sea vehicles with catamaran design.

The ship is one of many marine craft built by the Russian Federation for coastal defense, both domestically and for export. The weapons array Bora class warships carry varies depending on which of several configurations it is built to. The specifications listed are for the two existing craft.

British Hovercraft Corporation

British Hovercraft Corporation was the corporate entity created when the Saunders-Roe division of Westland Aircraft and Vickers Supermarine combined March 1966 with the intention of creating viable commercial hovercraft. Westland Aircraft held 65% of the shares, Vickers 25% and the National Research Development Corporation 10%.

None of the Vickers designs were 'taken forward', the existing production of the Saunders-Roe designs continued (SR.N5 Warden class and SR.N6 Winchester class) and the Saunders-Roe designed SR.N4 (Mountbatten class), was completed and entered service on the English Channel.

Only one new design was produced (1969) by the British Hovercraft Corporation, the BH.7 (Wellington class).

In 1970, Westland Aircraft acquired the shares of the other parties. In 1971 Cushioncraft was acquired from Britten-Norman. In 1984, the company was renamed Westland Aerospace – hovercraft design/manufacture had effectively ceased and the company was involved with the manufacture of composites for the aerospace industry.

The British Hovercraft Corporation was responsible for the largest Union Flag in the world. It was painted on the doors of their hangar on the seafront at East Cowes in 1977 to celebrate the Silver Jubilee of Elizabeth II.

Czilim-class hovercraft

The Czilim class ACV (Project 20910) is a small patrol hovercraft operated by the Border Guard Service of Russia.

Dave Krusen

David Karl Krusen (born March 10, 1966) is an American musician who is best known for being the first drummer for the American rock band Pearl Jam and for his work on the band's debut album, Ten. Krusen was also a member of the bands Hovercraft and Unified Theory, and is currently the drummer for Candlebox.

Krusen was inducted into the Rock and Roll Hall of Fame as a member of Pearl Jam on April 7, 2017.

Dirty Hungarian Phrasebook

"Dirty Hungarian Phrasebook" is a Monty Python sketch. It first aired in 1970 on Monty Python's Flying Circus as part of Episode 25. Atlas Obscura has noted that it may have been inspired by English As She Is Spoke, a 19th-century Portuguese/English phrase book regarded as a classic source of unintentional humour, as the given English translations are generally completely incoherent.

Griffon Hoverwork

Griffon Hoverwork Ltd (GHL) is a British hovercraft designer and manufacturer. It was founded after Griffon Hovercraft Ltd of Southampton, and Hoverwork Ltd of the Isle of Wight, were acquired by the Bland Group in 2008, then merged in 2009. Griffon is now based along the River Itchen in Southampton.

The company supply hovercraft, boats and other specialised marine services to governments, NGOs, and private companies for use in humanitarian, search and rescue, security and commercial roles.

Ground effect train

A ground effect train is an alternative to a magnetic levitation (maglev) train. In both cases the objective is to prevent the vehicle from making contact with the ground. Whereas a maglev train accomplishes this through the use of magnetism, a ground effect train uses an air cushion; either in the manner of a hovercraft (as in hovertrains) or using the "wing-in-ground" design.

The advantages of a ground effect train over a maglev are lower cost due to simpler construction. Disadvantages include either constant input of energy to keep the train hovering (in the case of hovercraft-like vehicles) or the necessity to keep the vehicle moving for it to remain off the ground (in the case of Wing In Ground effect vehicles). Furthermore, these vehicles may be very drastically affected by wind, air turbulence, and weather. Whereas the magnetic levitation train can be built to operate in a vacuum to minimise air resistance, the ground effect train must operate in an atmosphere in order for the air cushion to exist.

Development work has been undertaken in several countries since the middle 20th century. No ground effect train has entered regular commercial service.

Yusuke Sugahara and his team of researchers at Tohoku University, in Sendai, Japan have developed the Aero-Train that uses wings attached to a fuselage to literally fly inches off the ground. Dubbed a “ground-effect vehicle” the train is designed to be completely powered by wind and solar energy — making this a true zero-carbon transportation system.

Gus-class LCAC

The Gus-class LCAC was a medium-sized assault hovercraft operated by the Soviet Navy from 1969 until the early 1990s.

High-speed craft

A high-speed craft (HSC) is a high-speed water vessel for civilian use, also called a fastcraft or fast ferry. The first high-speed craft were often hydrofoils or hovercraft, but in the 1990s catamaran and monohull designs become more popular and large hydrofoils and hovercraft are no longer built. Most high-speed craft serve as passenger ferries, but the largest catamarans and monohulls also carry cars, buses, large trucks and freight.

In the 1990s there were a variety of builders, but many ship builders have withdrawn from this market so the construction of the largest fast ferries, up to 127 metres, has been consolidated to two Australian companies, Austal of Perth and Incat of Hobart. There is still a wide variety of builders for smaller fast catamaran ferries between 24 and 60 metres.

Hulled designs are often powered by pump-jets coupled to medium-speed diesel engines. Hovercraft are usually powered by gas turbines or diesel engines driving propellers and impellers.

The design and safety of high-speed craft is regulated by the International Convention for the Safety of Life at Sea (SOLAS) Convention, Chapter 10, High-Speed Craft (HSC) Codes of 1994 and 2000, adopted by the Maritime Safety Committee of the International Maritime Organization (IMO).

In accordance with SOLAS Chapter 10 Reg. 1.3, high-speed crafts are crafts capable of a maximum speed, in metres per second (m/s), equal to or exceeding:

where = volume of displacement in cubic metres corresponding to the design waterline, excluding craft of which the hull is supported clear above the water surface in non-displacement mode by aerodynamic forces generated by ground effect.

Hovercar

A hover car is a personal vehicle that flies at a constant altitude of up to few meters (some feet) above the ground and used for personal transportation in the same way a modern automobile is employed. It usually appears in works of science fiction.

In science fiction, it is usually capable of elevating itself some distance from the ground through some repulsion technology, presumably exploiting some short range anti-gravity principle so as to eliminate most friction forces which act against conventional vehicles. Other works feature vehicles that hover by having magnetic plates lined along roads, operating in a similar principle to Maglev. The capability of hovering above the ground eliminates the need for tires, and unlike an air-cushion vehicle, it does not produce a dust cloud.

The closest real-world devices are the hovercraft, which elevates itself above a water or level hard surface using a cushion of air retained by a flexible skirt, and the hovertrain, which is a type of high-speed train that replaces conventional steel wheels with hovercraft lift pads, and the conventional railway bed with a paved road-like surface, known as the "track" or "guideway".

Hovercraft (band)

Hovercraft was an instrumental experimental rock group that formed in Seattle, Washington in 1993. It was co-founded by its core duo of guitarist/samplist/tape looper Ryan Shinn, and bassist Beth Liebling. Liebling and Shinn would use the pseudonyms "Sadie 7" and "Campbell 2000", respectively, throughout the duration of the band's history. Hovercraft has been cited as one of the most abrasive, non-commercial sounding bands ever to receive major-label distribution for its albums. Though somewhat overlooked and sometimes heavily criticized because of the band's early association with a platinum-selling rock star, the group was largely well respected and well received by critics and developed a cult following.

Lebed-class LCAC

The Kalmar class (Project 1206, NATO reporting name Lebed) are a class of medium-sized assault hovercraft designed for the Soviet Navy. The few remaining craft are operated by the Russian Navy.

Designed by the design bureau wing of Almaz shipbuilding company early in the 1970s, production started in 1972 and continued until 1985 in plants at Leningrad and Theodosia.

Oita Airport

Oita Airport (大分空港, Ōita Kūkō) (IATA: OIT, ICAO: RJFO) is an airport in Kunisaki, Ōita, Japan, 16 NM (30 km; 18 mi) northeast of Ōita.

The airport is accessible by bus but not by train. Hovercraft service to Oita was available until 2009, it was the last hovercraft service in Japan.

RNLI hovercraft lifeboat

H-class Rescue Hovercraft serve the shores of the United Kingdom as a part of the RNLI inshore fleet. The class are of a modified Type 470TD design built by Griffon Hovercraft.

The hovercraft was developed to operate in tidal areas such as Morecambe Bay where strandings by incoming tides can have fatal consequences and where normal craft are unable to operate, for example due to mud flats.

Hovercraft also operate out of Hunstanton, Hoylake, and Southend-on-Sea stations.

SR.N6

The Saunders-Roe (later British Hovercraft Corporation) SR.N6 hovercraft (also known as the Winchester class) was essentially a larger version of the earlier SR.N5 series. It incorporated several features that resulted in the type becoming the one of most produced and commercially successful hovercraft designs in the world.

While the SR.N2 and SR.N5s operated in commercial service as trials craft, the SR.N6 has the distinction of being the first production hovercraft to enter commercial service. In comparison to the SR.N5, the SR.N6 was stretched in length, providing more than double the seating capacity. Some models of the craft were stretched further, enabling an even greater capacity.

Experience gained in the development of the SR.N6 has been attributed as heavily contributing towards the design and production of the largest civil hovercraft to be ever produced, the SR.N4. Several major design features of the SR.N6 appeared on both the SR.N4 and further hovercraft designs by Saunders-Roe and its successor, the British Hovercraft Corporation.

Tracked Hovercraft

Tracked Hovercraft was an experimental high speed train developed in the United Kingdom during the 1960s. It combined two British inventions, the hovercraft and linear induction motor, in an effort to produce a train system that would provide 250 mph (400 km/h) inter-city service with lowered capital costs compared to other high-speed solutions. Substantially similar to the French Aérotrain and other hovertrain systems of the 1960s, Tracked Hovercraft suffered a similar fate to these projects when it was cancelled as a part of wide budget cuts in 1973.

Westland Helicopters

Westland Helicopters was a British aerospace company. Originally Westland Aircraft, the company focused on helicopters after the Second World War. It was amalgamated with several other British firms in 1960 and 1961. In 2000, it merged with Italian helicopter manufacturer Agusta to form AgustaWestland, which in turn merged into Leonardo-Finmeccanica in 2016.

Zubr-class LCAC

The Zubr class (Project 1232.2, NATO reporting name "Pomornik") is a class of air-cushioned landing craft (LCAC). This class of military hovercraft is, as of 2012, the world's largest, with a standard full load displacement of 555 tons. The hovercraft is designed to sealift amphibious assault units (such as marines and tanks) from equipped/non-equipped vessels to non-equipped shores, as well as transport and plant naval mines.

There are ten Zubr-class hovercraft in service. There are two vessels in the Russian Navy and four with the Hellenic Navy. In 2009, China placed an order for four vessels from Ukraine [order transferred to Russia now] as part of a deal worth 315 million USD. Two updated versions of the vessels were built by Crimea's Feodosia Shipbuilding Company, followed by two advanced models of the surface warship.The purchase of HS Cephalonia (L 180) for the Hellenic Navy marked the first time a Soviet-designed naval craft had been built for a NATO member.In June 2017, Russia announced it was restarting production of the Zubr-class craft. Representatives from the Russian shipbuilding industry soon after responded by stating production could not possibly resume in 2018 and would only be possible by 2019–2021, refuting the government position. Representatives cited the lack of availability of and inability to mass-produce components, notably gas turbine engines and reduction gears as the main obstacles.NPO Saturn (ODK GT) and Turboros developed marine gas turbine M70FRU (D090), FR RU, M70FRU2 (DP/DM71) along M90FR, M75RU, E70RD8 and Elektrosila, AO Zvezda, Metallist, Samara and others developed redactors and gears. Fan and Turboprop provided by NK Kuznetsov, Aerosila, among others (perhaps some like Aviadvigatel, Salut, AMNTK, UMPO, KMPO, having high and long experience and production).

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