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A ground-effect vehicle (GEV), also called a wing-in-ground-effect (WIG), ground-effect craft, wingship, flarecraft or ekranoplan (russian: экранопла́н – "screenglider"), is a
vehicle A vehicle (from la, vehiculum) is a machine that transports people or cargo. Vehicles include wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses, mobility scooters for disabled people), railed vehicles (trains, trams), wa ...
that is able to move over the surface by gaining support from the reactions of the air against the surface of the earth or water. Typically, it is designed to glide over a level surface (usually over the sea) by making use of ground effect, the aerodynamic interaction between the moving wing and the surface below. Some models can operate over any flat area such as frozen lakes or flat plains similar to a
hovercraft A hovercraft, also known as an air-cushion vehicle or ACV, is an amphibious Craft (vehicle), 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 ...
.


Design

A ground-effect vehicle needs some forward velocity to produce lift dynamically, and the principal benefit of operating a wing in ground effect is to reduce its lift-dependent drag. The basic design principle is that the closer the wing operates to an external surface such as the ground, when it is said to be in ground effect, the less drag it feels. An
airfoil An airfoil (American English) or aerofoil (British English) is the cross-sectional shape of an object whose motion through a gas is capable of generating significant lift, such as a wing, a sail, or the blades of propeller, rotor, or turbine. ...
passing through air increases air pressure on the underside, while decreasing pressure across the top. The high and low pressures are maintained until they flow off the ends of the wings, where they form vortices which in turn are the major cause of
lift-induced drag In aerodynamics, lift-induced drag, induced drag, vortex drag, or sometimes drag due to lift, is an aerodynamic drag force that occurs whenever a moving object redirects the airflow coming at it. This drag force occurs in airplanes due to wings or ...
—normally a significant portion of the drag affecting an aircraft. The greater the span of a wing, the less induced drag created for each unit of lift and the greater the efficiency of the particular wing. This is the primary reason
glider Glider may refer to: Aircraft and transport Aircraft * Glider (aircraft), heavier-than-air aircraft primarily intended for unpowered flight ** Glider (sailplane), a rigid-winged glider aircraft with an undercarriage, used in the sport of glidin ...
s have long wings. Placing the same wing near a surface such as the water or the ground has the effect of increasing the aspect ratio, but without having the complications associated with a long and slender wing, so that the short stubs on a GEV can produce just as much lift as the much larger wing on a transport aircraft, though it can do this only when close to the earth's surface. Once sufficient speed has built up, some GEVs may be capable of leaving ground effect and functioning as normal aircraft until they approach their destination. The distinguishing characteristic is that they are unable to land or take off without a significant amount of help from the ground effect cushion, and cannot climb until they have reached a much higher speed. A GEV is sometimes characterized as a transition between a
hovercraft A hovercraft, also known as an air-cushion vehicle or ACV, is an amphibious Craft (vehicle), 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 ...
and an
aircraft An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines ...
, although this is not correct as a hovercraft is statically supported upon a cushion of pressurized air from an onboard downward-directed fan. Some GEV designs, such as the Russian ''Lun'' and ''Dingo'', have used forced blowing under the wing by auxiliary engines to increase the high pressure area under the wing to assist the takeoff; however they differ from hovercraft in still requiring forward motion to generate sufficient lift to fly. Although the GEV may look similar to the
seaplane A seaplane is a powered fixed-wing aircraft capable of takeoff, taking off and water landing, landing (alighting) on water.Gunston, "The Cambridge Aerospace Dictionary", 2009. Seaplanes are usually divided into two categories based on their tec ...
and share many technical characteristics, it is generally not designed to fly out of ground effect. It differs from the
hovercraft A hovercraft, also known as an air-cushion vehicle or ACV, is an amphibious Craft (vehicle), 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 ...
in lacking low-speed hover capability in much the same way that a fixed-wing airplane differs from the
helicopter A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward and laterally. These attributes ...
. Unlike the
hydrofoil A hydrofoil is a lifting surface, or foil, that operates in water. They are similar in appearance and purpose to aerofoils used by aeroplanes. Boats that use hydrofoil technology are also simply termed hydrofoils. As a hydrofoil craft gains sp ...
, it does not have any contact with the surface of the water when in "flight". The ground-effect vehicle constitutes a unique class of transportation. The Boston-based (United States) company REGENT proposed an electric-powered high-wing design with a standard hull for water operations, but also incorporated fore- and aft-mounted
hydrofoil A hydrofoil is a lifting surface, or foil, that operates in water. They are similar in appearance and purpose to aerofoils used by aeroplanes. Boats that use hydrofoil technology are also simply termed hydrofoils. As a hydrofoil craft gains sp ...
units designed to lift the craft out of the water during takeoff run, to facilitate lower liftoff speeds.


Wing configurations


Straight wing

Used by the Russian
Rostislav Alexeyev Rostislav Evgenievich Alexeyev (russian: Ростисла́в Евге́ньевич Алексе́ев; December 18, 1916 – February 9, 1980) was a Russian Soviet Director & Chief of Design known for his pioneering work on hydrofoil ships and ...
for his ekranoplan. The wings are significantly shorter than those of comparable aircraft, and this configuration requires a high aft-placed horizontal tail to maintain stability. The pitch and altitude stability comes from the lift slopeCl/da, with Cl = lift coefficient, and a = angle of incidence. difference between a front low wing in ground-effect (commonly the main wing) and an aft, higher-located second wing nearly out of ground-effect (generally named a stabilizer).


Reverse-delta wing

Developed by
Alexander Lippisch Alexander Martin Lippisch (November 2, 1894 – February 11, 1976) was a German aeronautical engineer, a pioneer of aerodynamics who made important contributions to the understanding of tailless aircraft, delta wings and the ground effect, and a ...
, this wing allows stable flight in ground-effect through self-stabilization. This is the main Class B form of GEV.


Tandem wings

Tandem wings can have three configurations: * A
biplane A biplane is a fixed-wing aircraft with two main wings stacked one above the other. The first powered, controlled aeroplane to fly, the Wright Flyer, used a biplane wing arrangement, as did many aircraft in the early years of aviation. While ...
-style type-1 utilising a shoulder-mounted main lift wing and belly-mounted
sponson Sponsons are projections extending from the sides of land vehicles, aircraft or watercraft to provide protection, stability, storage locations, mounting points for weapons or other devices, or equipment housing. Watercraft On watercraft, a spon ...
s similar to those on combat and transport helicopters. * A canard-style type-2 with a mid-size horizontal wingNot a stabilizer because destabilizing. near the nose of the craft directing airflow under the main lift airfoil. This type-2 tandem design is a major improvement during takeoff, as it creates an air cushion to lift the craft above the water at a lower speed, thereby reducing water drag, which is the biggest obstacle to successful seaplane launches. * Two stubby wings as in the tandem-airfoil flairboat produced by Günther Jörg in Germany. His particular design is self-stabilizing longitudinally.


Advantages and disadvantages

Given similar hull size and power, and depending on its specific design, the lower
lift-induced drag In aerodynamics, lift-induced drag, induced drag, vortex drag, or sometimes drag due to lift, is an aerodynamic drag force that occurs whenever a moving object redirects the airflow coming at it. This drag force occurs in airplanes due to wings or ...
of a GEV, as compared to an aircraft of similar capacity, will improve its fuel efficiency and, up to a point, its speed. GEVs are also much faster than surface vessels of similar power, because they avoid drag from the water. On the water the aircraft-like construction of GEVs increases the risk of damage in collisions with surface objects. Furthermore, the limited number of egress points make it more difficult to evacuate the vehicle in an emergency. Since most GEVs are designed to operate from water, accidents and engine failure typically are less hazardous than in a land-based aircraft, but the lack of altitude control leaves the pilot with fewer options for avoiding collision, and to some extent that negates such benefits. Low altitude brings high-speed craft into conflict with ships, buildings and rising land, which may not be sufficiently visible in poor conditions to avoid. GEVs may be unable to climb over or turn sharply enough to avoid collisions, while drastic, low-level maneuvers risk contact with solid or water hazards beneath. Aircraft can climb over most obstacles, but GEVs are more limited. In high winds, take-off must be into the wind, which takes the craft across successive lines of waves, causing heavy pounding, stressing the craft and creating an uncomfortable ride. In light winds, waves may be in any direction, which can make control difficult as each wave causes the vehicle to both pitch and roll. The lighter construction of GEVs makes their ability to operate in higher sea states less than that of conventional ships, but greater than the ability of hovercraft or hydrofoils, which are closer to the water surface. The demise of the conventional seaplane was a result of its inability to operate in rough sea conditions even while flying conditions were good, and its use lasted only until runways were more commonly available. GEVs are similarly limited. Like conventional aircraft, greater power is needed for takeoff, and, like seaplanes, ground-effect vehicles must get on the
step Step(s) or STEP may refer to: Common meanings * Stairs#Step, Steps, making a staircase * Walking * Dance move * Military step, or march ** Marching Arts Films and television * Steps (TV series), ''Steps'' (TV series), Hong Kong * Step (film), ' ...
before they can accelerate to flight speed. Careful design, usually with multiple redesigns of hullforms, is required to get this right, which increases engineering costs. This obstacle is more difficult for GEVs with short production runs to overcome. For the vehicle to work, its hull needs to be stable enough longitudinally to be controllable yet not so stable that it cannot lift off the water. The bottom of the vehicle must be formed to avoid excessive pressures on landing and taking off without sacrificing too much lateral stability, and it must not create too much spray, which damages the airframe and the engines. The Russian ekranoplans show evidence of fixes for these problems in the form of multiple chines on the forward part of the hull undersides and in the forward location of the jet engines. Finally, limited utility has kept production levels low enough that it has been impossible to amortize development costs sufficiently to make GEVs competitive with conventional aircraft. A 2014 study by students at NASA's Ames Research Center claims that use of GEVs for passenger travel could lead to cheaper flights, increased accessibility and less pollution.


Classification

One obstacle to GEV development is the classification and legislation to be applied. The
International Maritime Organization The International Maritime Organization (IMO, French: ''Organisation maritime internationale'') is a specialised agency of the United Nations responsible for regulating shipping. The IMO was established following agreement at a UN conference ...
has studied the application of rules based on the International Code of Safety for High-Speed Craft (HSC code) which was developed for fast ships such as
hydrofoil A hydrofoil is a lifting surface, or foil, that operates in water. They are similar in appearance and purpose to aerofoils used by aeroplanes. Boats that use hydrofoil technology are also simply termed hydrofoils. As a hydrofoil craft gains sp ...
s, hovercraft,
catamaran A Formula 16 beachable catamaran Powered catamaran passenger ferry at Salem, Massachusetts, United States A catamaran () (informally, a "cat") is a multi-hulled watercraft featuring two parallel hulls of equal size. It is a geometry-stab ...
s and the like. The Russian Rules for classification and construction of small type A ekranoplans is a document upon which most GEV design is based. However, in 2005, the IMO classified the WISE or GEV under the category of ships. The International Maritime Organization recognizes three types of GEVs: At the time of writing, those classes only applied to craft carrying 12 passengers or more, and (as of 2019) there was disagreement between national regulatory agencies about whether these vehicles should be classified, and regulated, as aircraft or as boats.


History

By the 1920s, the ''ground effect'' phenomenon was well-known, as pilots found that their airplanes appeared to become more efficient as they neared the runway surface during landing. In 1934 the US
National Advisory Committee for Aeronautics The National Advisory Committee for Aeronautics (NACA) was a United States federal agency founded on March 3, 1915, to undertake, promote, and institutionalize aeronautical research. On October 1, 1958, the agency was dissolved and its assets ...
issued Technical Memorandum 771, ''Ground Effect on the Takeoff and Landing of Airplanes'', which was a translation into English of a summary of French research on the subject. The French author Maurice Le Sueur had added a suggestion based on this phenomenon: "Here the imagination of inventors is offered a vast field. The ground interference reduces the power required for level flight in large proportions, so here is a means of rapid and at the same time ''economic'' locomotion: Design an airplane which is always within the ground-interference zone. At first glance this apparatus is dangerous because the ground is uneven and the altitude called skimming permits no freedom of maneuver. But on large-sized aircraft, over water, the question may be attempted ..." By the 1960s, the technology started maturing, in large part due to the independent contributions of
Rostislav Alexeyev Rostislav Evgenievich Alexeyev (russian: Ростисла́в Евге́ньевич Алексе́ев; December 18, 1916 – February 9, 1980) was a Russian Soviet Director & Chief of Design known for his pioneering work on hydrofoil ships and ...
in the
Soviet Union The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen national ...
and
German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ger ...
Alexander Lippisch Alexander Martin Lippisch (November 2, 1894 – February 11, 1976) was a German aeronautical engineer, a pioneer of aerodynamics who made important contributions to the understanding of tailless aircraft, delta wings and the ground effect, and a ...
, working in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
. Alexeyev worked from his background as a ship designer whereas Lippisch worked as an aeronautical engineer. The influence of Alexeyev and Lippisch remains noticeable in most GEVs seen today.


Soviet Union

Led by Alexeyev, the Soviet Central Hydrofoil Design Bureau (russian: ЦКБ СПК) was the center of ground-effect craft development in the USSR. The vehicle came to be known as an ekranoplan (russian: экранопла́н, экран ''screen'' + план ''plane'', from russian: эффект экрана, literally ''screen effect'', or ''ground effect'' in English). The military potential for such a craft was soon recognized, and Alexeyev received support and financial resources from Soviet leader
Nikita Khrushchev Nikita Sergeyevich Khrushchev (– 11 September 1971) was the First Secretary of the Communist Party of the Soviet Union from 1953 to 1964 and chairman of the country's Council of Ministers from 1958 to 1964. During his rule, Khrushchev s ...
. Some manned and unmanned prototypes were built, ranging up to eight tonnes in
displacement Displacement may refer to: Physical sciences Mathematics and Physics *Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...
. This led to the development of a 550-tonne military ''ekranoplan'' of length. The craft was dubbed the ''
Caspian Sea Monster The KM (Korabl Maket) (Russian: Корабль-Макет, literally "Ship-maquette" or "Model-Ship"), known colloquially as the Caspian Sea Monster, was an experimental ground effect vehicle developed in the Soviet Union in the 1960s by the C ...
'' by U.S. intelligence experts, after a huge, unknown craft was spotted on satellite reconnaissance photos of the Caspian Sea area in the 1960s. With its short wings, it looked airplane-like in planform, but would probably be incapable of flight. Although it was designed to travel a maximum of above the sea, it was found to be most efficient at , reaching a top speed of in research flights. The Soviet ''ekranoplan'' program continued with the support of
Minister of Defence A defence minister or minister of defence is a Cabinet (government), cabinet official position in charge of a ministry of defense, which regulates the armed forces in sovereign states. The role of a defence minister varies considerably from coun ...
Dmitriy Ustinov Dmitriy Fyodorovich Ustinov (russian: Дмитрий Фёдорович Устинов; 30 October 1908 – 20 December 1984) was a Marshal of the Soviet Union and Soviet politician during the Cold War. He served as a Central Committee sec ...
. It produced the most successful ''ekranoplan'' so far, the 125-tonne A-90 ''Orlyonok''. These craft were originally developed as high-speed military transports and were usually based on the shores of the
Caspian Sea The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad steppe of Central Asia ...
and
Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Roma ...
. The Soviet Navy ordered 120 ''Orlyonok''-class ''ekranoplans'', but this figure was later reduced to fewer than 30 vessels, with planned deployment mainly in the Black Sea and
Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden and the North and Central European Plain. The sea stretches from 53°N to 66°N latitude and from ...
fleets. A few ''Orlyonoks'' served with the Soviet Navy from 1979 to 1992. In 1987, the 400-tonne ''Lun''-class ''ekranoplan'' was built as an anti-ship missile launch platform. A second ''Lun'', renamed ''
Spasatel Spasatel (russian: Спасатель "Rescuer", "Lifesaver", Project 9038) is a ground-effect vehicle, originally planned by the Soviet Ministry of Defense. The vehicle was intended to serve as the missile carrier of the project ''Lun''-class e ...
'', was laid down as a rescue vessel, but was never finished. The two major problems that the Soviet ''ekranoplans'' faced were poor
longitudinal stability In flight dynamics, longitudinal stability is the stability of an aircraft in the longitudinal, or pitching, plane. This characteristic is important in determining whether an aircraft pilot will be able to control the aircraft in the pitching pla ...
and a need for reliable navigation. Minister Ustinov died in 1984, and the new Minister of Defence, Marshal Sokolov, cancelled funding for the program. Only three operational ''Orlyonok''-class ''ekranoplans'' (with revised hull design) and one ''Lun''-class ''ekranoplan'' remained at a naval base near
Kaspiysk Kaspiysk (russian: Каспи́йск; lbe, Ккасппи; av, Каспиялъухъ) is a city in the Republic of Dagestan, Russia, located on the Caspian Sea, southeast of Makhachkala. The 2010 Russian census recorded the city as being the f ...
. Since the
dissolution of the Soviet Union The dissolution of the Soviet Union, also negatively connoted as rus, Разва́л Сове́тского Сою́за, r=Razvál Sovétskogo Soyúza, ''Ruining of the Soviet Union''. was the process of internal disintegration within the Sov ...
, ''ekranoplans'' have been produced by the Volga Shipyard in
Nizhniy Novgorod Nizhny Novgorod ( ; rus, links=no, Нижний Новгород, a=Ru-Nizhny Novgorod.ogg, p=ˈnʲiʐnʲɪj ˈnovɡərət ), colloquially shortened to Nizhny, from the 13th to the 17th century Novgorod of the Lower Land, formerly known as Gork ...
. Smaller ''ekranoplans'' for non-military use have been under development. The CHDB had already developed the eight-seat Volga-2 in 1985, and Technologies and Transport is developing a smaller version called the Amphistar.
Beriev The PJSC Beriev Aircraft Company (russian: Таганрогский авиационный научно-технический комплекс им. Г. М. Бериева, , Beriev Taganrog Aviation Scientific Technical Complex), formerly Beriev ...
proposed a large craft of the type, the Be-2500, as a "flying ship" cargo carrier, but nothing came of the project.


Germany


Lippisch Type and Hanno Fischer

In Germany, Lippisch was asked to build a very fast boat for
American American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...
businessman
Arthur A. Collins Arthur Andrews Collins (September 9, 1909 – February 25, 1987) was a radio engineer and entrepreneur. He first gained national recognition as a teenager for significant advances in radio communication. He later founded his own radio engineering ...
. In 1963 Lippisch developed the X-112, a revolutionary design with reversed delta wing and T-tail. This design proved to be stable and efficient in ground effect, and even though it was successfully tested, Collins decided to stop the project and sold the patents to the German company Rhein Flugzeugbau (RFB), which further developed the inverse delta concept into the X-113 and the six-seat X-114. These craft could be flown out of ground effect so that, for example, peninsulas could be overflown. Hanno Fischer took over the works from RFB and created his own company, Fischer Flugmechanik, which eventually completed two models. The Airfisch 3 carried two persons, and the FS-8 carried six persons. The FS-8 was to be developed by Fischer Flugmechanik for a Singapore-Australian joint venture called Flightship. Powered by a V8 Chevrolet automobile engine rated at 337 kW, the prototype made its first flight in February 2001 in the Netherlands. The company no longer exists but the prototype craft was bought by Wigetworks, a company based in Singapore and renamed as AirFish 8. In 2010, that vehicle was registered as a ship in the Singapore Registry of Ships. The
University of Duisburg-Essen The University of Duisburg-Essen (german: link=no, Universität Duisburg-Essen) is a public research university in North Rhine-Westphalia, Germany. In the 2019 ''Times Higher Education World University Rankings'', the university was awarded ...
is supporting an ongoing research project to develop the ''Hoverwing''.


Günther Jörg-type tandem-airfoil flairboat

German engineer Günther Jörg, who had worked on Alexeyev's first designs and was familiar with the challenges of GEV design, developed a GEV with two wings in a tandem arrangement, the Jörg-II. It was the third, manned, tandem-airfoil boat, named "Skimmerfoil", which was developed during his consultancy period in South Africa. It was a simple and low-cost design of a first 4-seater tandem-airfoil flairboat completely constructed of aluminium. The prototype was in the SAAF Port Elizabeth Museum from 4 July 2007 until 2013, and is now in private use. Pictures of the museum show the boat after a period of some years outside the museum and without protection against the sun. The consultancy of Dipl. Ing. Günther Jörg, a specialist and insider of German airplane industry from 1963 and a colleague of Alexander Lippisch and Hanno Fischer, was founded with a fundamental knowledge of wing in ground effect physics, as well as results of fundamental tests under different conditions and designs having begun in 1960. For over 30 years, Jörg built and tested 15 different tandem-airfoil flairboats in different sizes and made of different materials. The following tandem-airfoil flairboat (TAF) types had been built after a previous period of nearly 10 years of research and development: # TAB VII-3: First manned tandem W.I.G type Jörg, being built at Technical University of Darmstadt, Akaflieg # TAF VII-5: Second manned tandem-airfoil Flairboat, 2 seater made of wood # TAF VIII-1: 2-seater tandem-airfoil flairboat built of glass-reinforced plastic (GRP) and aluminium. A small serie of 6 Flairboats had been produced by former Botec Company # TAF VIII-2: 4-seater tandem-airfoil Flairboat built of full aluminium (2 units) and built of GRP (3 units) # TAF VIII-3: 8-seater tandem-airfoil Flairboat built of aluminium combined with GRP parts # TAF VIII-4: 12-seater tandem-airfoil Flairboat built of aluminium combined with GRP parts # TAF VIII-3B: 6-seater tandem-airfoil flairboat under carbon fibre composite construction Bigger concepts are: 25-seater, 32-seater, 60-seater, 80-seater and bigger up to the size of a passenger airplane. Those tandem-airfoil flairboats are registered as motorboat and classified as type A WIG. In 1984, Jörg received the "Philip Morris Award" for future transportation. In 1987, the Botec Company was founded. After his death in 2010, the company continued under his daughter and former assistant Ingrid Schellhaas with her company Tandem WIG Consulting.


1980–1999

Since the 1980s GEVs have been primarily smaller craft designed for the recreational and civilian ferry markets.
Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...
,
Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...
and the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
have provided most of the activity with some development in
Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
,
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
,
Korea Korea ( ko, 한국, or , ) is a peninsular region in East Asia. Since 1945, it has been divided at or near the 38th parallel, with North Korea (Democratic People's Republic of Korea) comprising its northern half and South Korea (Republic o ...
and
Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the nort ...
. In these countries and regions, small craft with up to ten seats have been built. Other larger designs such as ferries and heavy transports have been proposed but have not been carried to completion. Besides the development of appropriate design and structural configuration, automatic control and navigation systems have been developed. These include altimeters with high accuracy for low altitude flight and lesser dependence on weather conditions. "Phase
radio altimeter Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmit ...
s" have become the choice for such applications beating
laser altimeter A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word "laser" is an acronym for "light amplification by stimulated emission of radiation". The fir ...
, isotropic or ultrasonic altimeters. With Russian consultation, the United States
Defense Advanced Research Projects Agency The Defense Advanced Research Projects Agency (DARPA) is a research and development agency of the United States Department of Defense responsible for the development of emerging technologies for use by the military. Originally known as the Adv ...
(DARPA) studied the
Aerocon Dash 1.6 wingship The Aerocon Dash-1.6 wingship was a proposed American ground-effect vehicle intended to carry large cargos and thousands of passengers over long distances at near-aircraft speeds. The vehicle was claimed to be able to carry a combination of of c ...
. Universal Hovercraft developed a flying hovercraft, first flying a prototype in 1996. Since 1999, the company has offered plans, parts, kits and manufactured ground effect hovercraft called the Hoverwing.


2000-

Iran deployed three squadrons of
Bavar 2 The HESA Bavar 2 ( fa, باور ٢) is a ground effect vehicle unveiled in September 2010 by the IRGC Navy. It is designed to have a small radar signature, and therefore be difficult to track on radar, to be able to remain undetected while carry ...
two-seat GEVs in September 2010. This GEV carries one machine gun and surveillance gear, and incorporates features to reduce its radar signature. In October 2014, satellite images showed the GEV in a shipyard in southern Iran. The GEV has two engines and no armament. In Singapore, Wigetworks obtained certification from
Lloyd's Register Lloyd's Register Group Limited (LR) is a technical and professional services organisation and a maritime classification society, wholly owned by the Lloyd’s Register Foundation, a UK charity dedicated to research and education in science and ...
for entry into class. On 31 March 2011, AirFish 8-001 became one of the first GEVs to be flagged with the Singapore Registry of Ships, one of the largest ship registries. Wigetworks partnered with
National University of Singapore The National University of Singapore (NUS) is a national public research university in Singapore. Founded in 1905 as the Straits Settlements and Federated Malay States Government Medical School, NUS is the oldest autonomous university in the c ...
's Engineering Department to develop higher capacity GEVs.
Burt Rutan Elbert Leander "Burt" Rutan (; born June 17, 1943) is a retired American aerospace engineer and entrepreneur noted for his originality in designing light, strong, unusual-looking, and energy-efficient air and space craft. He designed the record- ...
in 2011 and Korolev in 2015 showed GEV projects. In Korea, Wing Ship Technology Corporation developed and tested a 50-seat passenger GEV named the WSH-500. in 2013 Estonian transport company Sea Wolf Express planned to launch passenger service in 2019 between
Helsinki Helsinki ( or ; ; sv, Helsingfors, ) is the Capital city, capital, primate city, primate, and List of cities and towns in Finland, most populous city of Finland. Located on the shore of the Gulf of Finland, it is the seat of the region of U ...
and
Tallinn Tallinn () is the most populous and capital city of Estonia. Situated on a bay in north Estonia, on the shore of the Gulf of Finland of the Baltic Sea, Tallinn has a population of 437,811 (as of 2022) and administratively lies in the Harju ' ...
, a distance of 87 km taking only half an hour, using a Russian-built ekranoplan. The company ordered 15 ekranoplans with maximum speed of 185 km/h and capacity of 12 passengers, built by Russian RDC Aqualines. In 2021
Brittany Ferries Brittany Ferries is the trading name of the French shipping company, BAI Bretagne Angleterre Irlande S.A. founded in 1973 by Alexis Gourvennec, that operates a fleet of ferries and cruiseferries between France and the United Kingdom, Ireland, ...
announced that they were looking into using REGENT (Regional Electric Ground Effect Naval Transport) ground effect craft "seagliders" for cross
English Channel The English Channel, "The Sleeve"; nrf, la Maunche, "The Sleeve" (Cotentinais) or ( Jèrriais), (Guernésiais), "The Channel"; br, Mor Breizh, "Sea of Brittany"; cy, Môr Udd, "Lord's Sea"; kw, Mor Bretannek, "British Sea"; nl, Het Kana ...
services.
Southern Airways Express Southern Airways Express is a commuter airline operating across the United States with headquarters in Palm Beach, Florida. Southern Airways acts as a local service airline for dozens of cities across all U.S. time zones, Approximately a third ...
also placed firm orders for seagliders with intent to operate them along Florida's east coast. Around mid-2022, the Pentagon’s Defense Advanced Research Projects Agency (DARPA) launched its Liberty Lifter project, with the goal of creating a long-range, low-cost transport using the ekranoplan concept. The challenge is to carry 100 tons over 7,500 km, operate at sea without ground-based maintenance, all using low-cost materials.


See also

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Aerodynamically alleviated marine vehicle An aerodynamically alleviated marine vehicle (AAMV) is a high speed marine vehicle configuration that uses aerodynamically generated forces (lift) to 'alleviate' its weight. The advantage is that the hydrodynamic lift required to sustain the weight ...
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Ground effect (aerodynamics) For fixed-wing aircraft, ground effect is the reduced aerodynamic drag that an aircraft's wings generate when they are close to a fixed surface.. Reduced drag when in ground effect during takeoff can cause the aircraft to "float" while below the re ...
* Ground-effect train * List of ground-effect vehicles *
Surface effect ship A Surface Effect Ship (SES) or Sidewall Hovercraft is a watercraft that has both an air cushion, like a hovercraft, and twin hulls, like a catamaran. When the air cushion is in use, a small portion of the twin hulls remains in the water. When the ...
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Caspian Sea Monster The KM (Korabl Maket) (Russian: Корабль-Макет, literally "Ship-maquette" or "Model-Ship"), known colloquially as the Caspian Sea Monster, was an experimental ground effect vehicle developed in the Soviet Union in the 1960s by the C ...


Footnotes


Notes


Citations


Bibliography

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External links

* * * * * * * * * * * * * * {{DEFAULTSORT:Ground-Effect Vehicle Amphibious vehicles Aircraft configurations
Ekranoplan A ground-effect vehicle (GEV), also called a wing-in-ground-effect (WIG), ground-effect craft, wingship, flarecraft or ekranoplan (russian: экранопла́н – "screenglider"), is a vehicle that is able to move over the surface by gainin ...
Soviet inventions