Amphibious vehicle

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An amphibious vehicle (or simply amphibian), is a vehicle that is a means of transport viable on land as well as on or under water. Amphibious vehicles include amphibious bicycles, ATVs, cars, buses, trucks, railway vehicles, combat vehicles and hovercraft.

Contents

Classic landing craft are not amphibious vehicles as they do not offer any real land transportation at all, although they are part of amphibious warfare. Ground effect vehicles, such as ekranoplans, will likely crash on any but the flattest of landmasses so are also not considered to be amphibious vehicles.

A LARC-V 5-ton U.S. amphibious cargo vehicle LARC V vehicle.JPEG
A LARC-V 5-ton U.S. amphibious cargo vehicle

General technical notes

Pod Water Jet on a French VAB French VAB propeller dsc06844.jpg
Pod Water Jet on a French VAB
A Land Rover with inflatable floats to create a vehicle that will swim much like an improvised raft PICT6224 1 AMPHIBIOUS LAND ROVER 1.jpg
A Land Rover with inflatable floats to create a vehicle that will swim much like an improvised raft
Amphibious tour bus - a converted DUKW - , called Duck tour, on Thames river in London near Lambeth Bridge. Amphibious bus on Thames river.jpg
Amphibious tour bus a converted DUKW  , called Duck tour, on Thames river in London near Lambeth Bridge.

Apart from the distinction in sizes mentioned above, two main categories of amphibious vehicles are immediately apparent: those that travel on an air-cushion (Hovercraft) and those that do not. Amongst the latter, many designs were prompted by the desire to expand the off-road capabilities of land-vehicles to an "all-terrain" ability, in some cases not only focused on creating a transport that will work on land and water, but also on intermediates like ice, snow, mud, marsh, swamp etc. This explains why many designs use tracks in addition to or instead of wheels, and in some cases even resort to articulated body configurations or other unconventional designs such as screw-propelled vehicles which use auger-like barrels which propel a vehicle through muddy terrain with a twisting motion.[ citation needed ]

Most land vehicles – even lightly armoured ones – can be made amphibious simply by providing them with a waterproof hull and perhaps a propeller. This is possible as a vehicle's displacement is usually greater than its weight, and thus it will float. Heavily armoured vehicles however sometimes have a density greater than water (their weight in kilograms exceeds their volume in litres) and will need additional buoyancy measures. These can take the form of inflatable floatation devices, much like the sides of a rubber dinghy, or a waterproof fabric skirt raised from the top perimeter of the vehicle, to increase its displacement.

For propulsion in or on the water some vehicles simply make do by spinning their wheels or tracks, [1] [2] while others can power their way forward more effectively using (additional) screw propeller(s) or water jet(s). Most amphibians will work only as a displacement hull when in the water – only a small number of designs have the capability to raise out of the water when speed is gained, to achieve high velocity hydroplaning, skimming over the water surface like speedboats.

History

Alligator tug Bonnechere, 1907 Alligator boat 1.jpg
Alligator tug Bonnechere, 1907
LVT 'Buffalos' taking Canadian troops across the Scheldt in 1944 Acrossthescheldt.jpg
LVT 'Buffalos' taking Canadian troops across the Scheldt in 1944

Some of the earliest known amphibious vehicles were amphibious carriages, the invention of which is credited to the Neapolitan polymath Prince Raimondo di Sangro of Sansevero [3] in July 1770 or earlier, or Samuel Bentham whose design of 1781 was built in June 1787.

The first known self-propelled amphibious vehicle, a steam-powered wheeled dredging barge, named the Orukter Amphibolos, was conceived and built by United States inventor Oliver Evans in 1805, although it is disputed to have successfully travelled over land or water under its own steam. [4]

Inventor Gail Borden, better known for condensed milk, designed and tested a sail-powered wagon in 1849. On testing, it reportedly tipped over 50 feet (15 m) from shore, from an apparent lack of ballast to counteract the force of the wind in the sail. [5]

In the 1870s, logging companies in eastern Canada and the northern United States developed a steam-powered amphibious tug called an "Alligator" which could cross between lakes and rivers. The most successful Alligator tugs were produced by the firm of West and Peachey in Simcoe, Ontario. [6]

Until the late 1920s, the efforts to unify a boat and an automobile mostly came down to simply putting wheels and axles on a boat hull, or getting a rolling chassis to float by blending a boat-like hull with the car's frame. [7] One of the first reasonably well-documented cases was the 1905 amphibious petrol-powered carriage of T. Richmond (Jessup, Iowa, USA). Just like the world's first petrol-powered automobile (1885, Carl Benz), it was a three-wheeler. The single front wheel provided direction, both on land and in the water. A three-cylinder petrol combustion-engine powered the oversized rear wheels. In order to get the wheels to provide propulsion in the water, fins or buckets would be attached to the rear wheel spokes. Remarkably the boat-like hull was one of the first integral bodies ever used on a car. [7]

Since the 1920s, many diverse amphibious vehicles designs have been created for a broad range of applications, including recreation, expeditions, search & rescue, and military, leading to a myriad of concepts and variants. In some of them, the amphibious capabilities are central to their purpose, whereas in others they are only an expansion to what has remained primarily a watercraft or a land vehicle. The design that came together with all the features needed for a practical all-terrain amphibious vehicle was by Peter Prell of New Jersey. His design, unlike others, could operate not only on rivers and lakes but the sea and did not require firm ground to enter or exit the water. It combined a boat-like hull with tank-like tracks. In 1931, he tested a scaled down version of his invention. [8]

Recently,[ when? ] Gibbs Amphibians has developed a new type of amphibian, one capable of high speeds on both land and water. The vehicles use a patented hydraulic system to raise the wheels into the wheel wells, allowing the vehicles to plane on water. These vehicles can transition between land and water modes in about five seconds. The first Gibbs fast amphibian is the Quadski, introduced in October 2012. It went on sale in January 2013.[ promotion? ]

Iguana Yachts, a French company created in 2008, has developed amphibious motorboats featuring all-terrain tracks.

Sealegs Amphibious Craft, a three-wheeled amphibious boat designed in New Zealand, has been in production since 2005.

Water Car Panther driving at High Speeds on Lake Havasu, AZ. WaterCar Panther at High Speeds.jpg
Water Car Panther driving at High Speeds on Lake Havasu, AZ.

In 2010, a Southern California-based company named WaterCar set the Guinness World Record for Fastest Amphibious Vehicle, with their prototype, The Python, which reached top land speeds of 204 km/h (127 mph) and water speeds of 96 km/h (60 mph; 52 knots). [9] Since then, the company launched their first commercial vehicle, The Panther, which has been featured on ABC's The Bachelor as well as USA's Royal Pains . The WaterCar can do 80 mph (129 km/h) on land, and 44 mph (38 knots; 71 km/h) on sea, and can transition from land to sea in less than 15 seconds. [10]

Wheeled

Unarmored

Cycles

Amphibious bike 'Cyclomer', Paris, 1932 Amfibiefiets Amphibious bicycle.jpg
Amphibious bike 'Cyclomer', Paris, 1932

An amphibious cycle is a human-powered vehicle capable of operation on both land and water. "Saidullah's Bicycle" [11] uses four rectangular air filled floats for buoyancy, and is propelled using two fan blades which are attached to the spokes. Moraga's "Cyclo Amphibious" [12] uses a simple tricycle frame to support three floaters which provide both the floatation and thrust. The wings on the powered wheels propel the vehicle in a similar way to a paddle wheel.

The SBK Engineering Shuttle-Bike consists of two inflatable floats with straps that allow the carrying of a bicycle with a passenger. The ensemble, when deflated, fits in a backpack for carrying by the cyclist. [13]

Several amphibious cycles have been created by engineering students as university projects.

Gibbs Sports Amphibians Inc. introduced a motorized version of the amphibious cycle that resembles a jet ski on water and motorcycle on land. The model can reach up to 80 mph by land and 45 mph by water. [14]

ATVs

Land Tamer amphibious 8x8 remote access vehicle Amphibious-8x8.jpg
Land Tamer amphibious 8x8 remote access vehicle

Amongst the smallest non-air-cushioned amphibious vehicles are amphibious ATVs (all-terrain vehicles). These saw significant popularity in North America during the 1960s and early 1970s. Typically an amphibious ATV (AATV) is a small, lightweight, off-highway vehicle, constructed from an integral hard plastic or fibreglass bodytub, fitted with six (sometimes eight) driven wheels, with low pressure, balloon tires. With no suspension (other than what the tires offer) and no steering wheels, directional control is accomplished through skid-steering just as on a tracked vehicle either by braking the wheels on the side in the direction of the desired turn or by applying more throttle to the wheels on the opposite side. Most contemporary designs use garden tractor type engines, that will provide roughly 25 mph (40 km/h) top speed on land.

Constructed this way, an AATV will float with ample freeboard and is capable of traversing swamps, ponds, and streams as well as dry land. On land these units have high grip and great off-road ability, that can be further enhanced with an optional set of tracks that can be mounted directly onto the wheels. Although the spinning action of the tires is enough to propel the vehicle through the water albeit slowly outboard motors can be added for extended water use.

In October 2013, Gibbs Amphibians introduced the long-awaited Quadski, the first amphibious vehicle capable of traveling 45 mph on land or water. The Quadski was developed using Gibbs' High-Speed Amphibian technology, which Gibbs originally developed for the Aquada, an amphibious car, which the company has still not produced because of regulatory issues. [15]

Cars

VW Schwimmwagen in June 1944 Bundesarchiv Bild 101I-721-0372-13A, Frankreich, Offiziere in Schwimmkubel.jpg
VW Schwimmwagen in June 1944
Amphicar in Stuttgart, 2005 Amphicar-stuttgart-2005.jpg
Amphicar in Stuttgart, 2005

Amphibious automobiles have been conceived from ca. 1900; however, the Second World War significantly stimulated their development. Two of the most significant amphibious cars to date were developed during World War II. The most proliferous was the German Schwimmwagen , a small jeep-like 4x4 vehicle designed by the Porsche engineering firm in 1942 and widely used in World War II. The amphibious bodywork was designed by Erwin Komenda, the firm's body construction designer, using the engine and drive train of the Kübelwagen . An amphibious version of the Willys MB jeep, the Ford GPA or 'Seep' (short for Sea jeep) was developed during World War II as well. A specially modified GPA, called Half-Safe, was driven and sailed around the world by Australian Ben Carlin in the 1950s.

One of the most capable post-war amphibious off-roaders was the German Amphi-Ranger, that featured a hull made of seawater-resistant AlMg2 aluminium alloy. Extensively engineered, this costly vehicle was proven seaworthy at a Gale force 10 storm off the North Sea coast (Pohl, 1998). Only about 100 were built those who own one have found it capable of crossing the English Channel almost effortlessly.

Purely recreational amphibian cars include the 1960s Amphicar and the contemporary Gibbs Aquada. With almost 4,000 pieces built, the Amphicar is still the most successfully produced civilian amphibious car to date. The Gibbs Aquada stands out due to its capability of high-speed planing on water. Gibbs built fifty Aquadas in the early 2000s after it was developed by a team assembled by founder Alan Gibbs before the company's engine supplier, Rover, was unable to continue providing engines. Gibbs and new partner Neil Jenkins reconstituted the company and are now seeking U.S. regulatory approval for the Aquada. [16]

The Southern California-based company, WaterCar, founded by Dave March, has also built four working amphibious prototypes, one which holds the Guinness World Record for World's Fastest Amphibious Vehicle (The Python). In 2013, March released the company's first commercial vehicle, The Panther. Since its release, WaterCar has been popular in the Middle East, selling to the Embassy of the United Arab Emirates, with six additional vehicles being sold to the Crown Prince of Dubai. The WaterCar has also been sold to tech enthusiasts and residents of Silicon Valley. [17]

Other amphibious cars include the US Hydra Spyder and the Spira4u. [18]

Sealegs Amphibious Craft Kater-amfibiia Sealegs v Rossii2..jpg
Sealegs Amphibious Craft

Buses

Splashtour 'Amfibus' amphibious bus, An der Untertrave, Lubeck, 12 August 2020 Splashtour 'Amfibus' amphibious bus, An der Untertrave, Lubeck, 12 August 2020.jpg
Splashtour 'Amfibus' amphibious bus, An der Untertrave, Lübeck, 12 August 2020

Amfibus amphibious buses made by Dutch Amfibious Transport (DAT) in Nijmegen, Netherlands are used to operate tours of Amsterdam, Rotterdam and Lübeck, under the Splashtours brand. The buses have a Volvo chassis and carry 43 passengers. The operation started in 2010 in Katendrecht, Rotterdam, was copied in Amsterdam in 2011 but suspended in 2012 after technical problems, and then relaunched in 2019. [19] A tour of Lübeck was launched in 2014. [20] In 2010 it was tested as a replacement for the ferry at Renfrew, Scotland, but not adopted. [21] A similar service, using different vehicles, operates in Porto.

Boats

Some amphibious vehicles, rather than being designed for land transport with the ability to cross water, are designed as water-transport vehicles with the ability to travel on land. The distinction is that the vehicles are designed to be high performing on water, with the land transport ability added to give additional functionality, rather than being the main function. Sealegs Amphibious Craft are an example of this, which are a range of aluminium fabricated boats (mostly RIBs) designed and manufactured in Auckland, New Zealand. These craft can travel up to 39 knots on water, but travel at only 7.5 km/hr on land, showing the preference for water performance in design. Various versions of this type of amphibious boat design have been produced, including the Iguana Yacht (covered in the "Tracked" section below).

Oyster boat in the harbour at Gorey, Jersey Oyster boat, Gorey.JPG
Oyster boat in the harbour at Gorey, Jersey
Oyster boats

Since 1977, several boat builders in Brittany have built specialized amphibious vehicles for use in the area's mussel and oyster farming occupations. The boats are made of aluminium, are relatively flat-bottomed, and have three, four, or six wheels, depending on the size of the boat. When the tide is out the boats can run on the tidal flats using their wheels. When the tide is in, they use a propeller to move through the water. Oyster farmers in Jersey make use of similar boats. Currently, Constructions Maritimes du Vivier Amphibie has a range of models. [22]

Cargo

Trucks and barges
A DUKW during World War II DUKW.image2.army.jpg
A DUKW during World War II
A British Alvis Stalwart Alvis Stalwart W&P2011.JPG
A British Alvis Stalwart

With more than 20,000 units produced, the DUKW was the most successful amphibious truck of World War II. This 31-foot (9.4 m) 6x6 truck was used to establish and supply beachheads. It was designed as a wartime project by Sparkman & Stephens, a yacht design firm who also designed the hull for the Ford GPA 'Seep'. Britain developed the Terrapin 8x8 amphibious cargo carrier which was used by 79th Armoured Division during the Walcheren campaign. While offering greater capacity than the DUKW, ease of operation favoured the DUKW. An improved version of the Terrapin never got beyond prototype stage. During the war, Germany produced the Landwasserschlepper . In the 1950s, the Soviets developed the GAZ-46, BAV 485, and PTS.

During the Vietnam War, the US Army used the amphibious articulated Gama Goat and the larger M520 Goer truck-series to move supplies through the canals and rice paddies of Southeast Asia. The latter was based on a 1950s civil construction vehicle and became the US Army's standard heavy tactical truck before its replacement by the HEMTT. Although the vehicles' wheels were mounted without suspension or steering action, and land speeds over 20 mph (32 km/h) were ill-advised, its articulated design provided it with good maneuverability and helped it to keep all four wheels firmly in touch with uneven ground. Coupled with its amphibious capability, in the Vietnam War, the M520 Goer developed a reputation of being able to go where other trucks could not.

For taking vehicles and supplies onto the beaches the US used the 1950s designed LARC-V and the huge LARC-LX which could carry 60 tons of cargo.

The British Army used the 6x6 wheeled Alvis Stalwart as their amphibious cargo carrier. In the water vectored thrust water-jet propulsion units drove it along at about 6 knots.

The M3 Amphibious Rig can be used as a ferry or as a floating bridge for trucks and heavy combat vehicles.

Gibbs has also developed other types of fast amphibians including the Phibian, a 30-foot (9.1 m) amphibian that is aimed at first responder market, and the Humdinga, a 21-foot (6.4 m) amphibian that is capable of traversing extreme terrain. [23]

Armored

BTR-80s coming ashore, engine snorkels and waterjet deployed BTR-80 coming ashore.jpg
BTR-80s coming ashore, engine snorkels and waterjet deployed

Many modern military vehicles, ranging from light wheeled command and reconnaissance vehicles, through armoured personnel carriers (APCs), tanks and amphibious warfare ships, are manufactured with amphibious capabilities.

The French Panhard VBL is a compact, lightly armored 4x4 all-terrain vehicle that is fully amphibious and can swim at 5.4 km/h (3.4 mph). The VAB is a French fully amphibious APC, powered in the water by two water jets, mounted one on either side of the rear hull (see detail picture above). It entered service in 1976 and around 5000 were produced in many configurations.

During the Cold War the Soviet bloc states developed a number of amphibious APCs, fighting vehicles and tanks, both wheeled and tracked. Most of the vehicles the Soviets designed were amphibious or could ford deep water. Wheeled examples are the BRDM-1 and BRDM-2 4x4 armored scout cars, as well as the BTR-60, BTR-70, BTR-80 and BTR-94 8x8 APCs and the BTR-90 infantry fighting vehicle.

Tracked

Unarmored

M29 Weasel

The M29 Weasel (Studebaker Weasel), whilst originally designed as a snow vehicle, operated successfully in an amphibious role by the addition of front and rear floats. The basic vehicle will float but its bow is square so the additional floats add stability and load carrying capacity.

Armored

Two U.S. Marine Corps AAV-7s emerge from the surf AAV-australia.jpg
Two U.S. Marine Corps AAV-7s emerge from the surf

Tracked armored vehicles with amphibious capabilities include those that are intended for use in amphibious assault. The United States started developing a long line of LVT (Landing Vehicle Tracked) designs from around 1940.

Many tracked armored vehicles that are primarily intended for land-use, such as armoured fighting vehicles and armoured personnel carriers nevertheless also have amphibious ability, tactically useful inland, reducing dependence on destroyable and easily targeted bridges. To provide motive power, they use their tracks, sometimes with an added propeller or water jets. As long as the opposite bank has a shallow enough slope for the vehicle to climb out within a few miles, they can cross rivers and water obstacles. An American example is the M113 Armored Personnel Carrier. Soviet examples are the PT-76 amphibious tank, and the BTR-50 and MT-LB APCs based on its chassis.

Some heavier tanks have an amphibious mode in which a fabric skirt is needed to add buoyancy. The Sherman DD tank used in the D-Day invasion had this setup. When in water the waterproof float screen was raised and propellers deployed. The M2 and M3 Bradleys also need such a skirt.

Tanks

Vickers Carden Loyd amphibious tank Vickers Light Amphibious Tank.jpg
Vickers Carden Loyd amphibious tank
1944 Sherman DD (Duplex Drive) amphibious tank with float screens lowered DD-Tank.jpg
1944 Sherman DD (Duplex Drive) amphibious tank with float screens lowered

At the end of World War I a Mark IX tank had drums attached to the side and front and was tested as an amphibious vehicle launched into Hendon Reservoir. [24] A modified Medium Mark D successfully swam in a river near Christchurch. [25]

By the early 1930s, Vickers had developed an amphibious tank. By using very thin armour, flotation could be achieved without external buoyancy aids. The British Army trialled the Vickers-Carden-Loyd Light Amphibious Tank but did not adopt it for service use. An order was placed with Vickers by the USSR for a small number of tanks. After negotiations to purchase the Vickers tank by Poland failed, they developed their own design the PZInż 130 but dropped the idea of amphibious tanks as obsolete. A pontoon based tank, the L1E3, was produced by Vickers in 1939.

In World War II the British further developed amphibious tanks. The Crusader was trialled with two pontoons that could be attached or removed, the tracks driving the tank in the water. The "Medium Tank A/T 1" was a tank with inbuilt buoyancy some 24 ft (7.3 m) long and 11 ft (3.4 m) tall. The Valentine, then the M4 Sherman medium tank were made amphibious with the addition of a rubberized canvas screen to provide additional buoyancy and propellers driven by the main engine to give propulsion. These were DD tanks (from "Duplex Drive") and the Sherman DD was used on D-Day to provide close fire support on the beaches during the initial landings. The Sherman DD could not fire when afloat as the buoyancy screen was higher than the gun. A number swamped and sank in the operation, due to rough weather in the English Channel (with some tanks having been launched too far out), and to turning in the current to converge on a specific point on the battlefield, which allowed waves to breach over the screens. Those making it ashore, however, provided essential fire support in the first critical hours.

Before World War II, The Soviets produced light amphibious tanks called T-37A and T-38. A third serial model, T-40, started production after the beginning of the war. A 14-ton tank, PT-1 was created but was not mass-produced. In addition, an attempt was made to attach pontoons to T-26. While successful, the project was closed due to the high vulnerability and unwieldiness of the construction.

Polish PT-76 amphibious light tank coming out of the water PT 76 7 DOW TBiU 12.jpg
Polish PT-76 amphibious light tank coming out of the water

Some light tanks such as the PT-76 are amphibious, typically being propelled in the water by hydrojets or by their tracks. In 1969, the U.S. Army rushed the new M551 Sheridan to Vietnam. This 17 ton light tank was built with an aluminium hull, steel turret, and the 152 mm "gun-launcher" (which could fire the MGM-51 Shillelagh missile), and could swim across bodies of water. The M551 upon arrival in Vietnam began replacing the M48A3 Patton in all cavalry squadrons, leaving only the M48A3 in the U.S. Army's three armored battalions in Vietnam, the 1/77th, 1/69th, and the 2/34th Armor. The Sheridan needed no modifications for river crossings: crewmen simply raised the cloth sides that were tucked inside rubber tubes along the hull's upper edges, raised the driver's front shield which had an acrylic glass window, the driver turned on his bilge pumps, shifted his transmission lever to water operations and the Sheridan entered the water. For newly arrived Sheridans, this might work as engineered. For "war-weary" M551s, the driver's window was often "yellowed" or cracked as to obscure his vision, and the rubber tubes that contained the rolled up side sleeves were often cracked or frozen into place. The Sheridan could still cross a body of water, but like its swimming cousin, the M113 armoured personnel carrier, also built of aluminium) the river had to be narrow, less than 100 yards (100 m). In all cases, the bilge pumps had to be working properly, and even then by the time the Sheridan or the APC reached the other side, water would often fill the insides up to their armoured roofs, spilling through the hatches' cracks and emptying onto the earth once safely ashore. Often a fold-down trim vane is erected to stop water washing over the bow of the tank and thus reducing the risk of the vehicle being swamped via the driver's hatch.

During the Cold War, the Swedish Stridsvagn 103 main battle tank carried flotation gear all the time and was, therefore, theoretically, always amphibious.

Multi-unit

Hagglunds Bv206 in US military service as M-973 SUSV (small unit support vehicle). US 5055th Range Squadron M973 SUSV.jpg
Hagglunds Bv206 in US military service as M-973 SUSV (small unit support vehicle).

According to a 1999 article in Military Parade magazine, [26] multi-unit, all-terrain transport vehicles were first proposed by the British in 1913, and by the 1950s, over 40 types of articulated tracked vehicles (ATV) were in production. The articulated tracked concept is chosen primarily for its combination of high maneuverability, cross-country abilities, and load-carrying capacity. In some cases the design is made amphibious, giving them all-terrain capability in the truest sense. Usually, the front unit houses at least the engine, gearboxes, fuel tank(s) and the driver's compartment, and perhaps there is some space left for cargo or passengers, whereas the rear unit is the primary load carrier.

Examples of this concept are the Russian Vityaz, Swedish Volvo Bv202 and Hagglunds Bv206 designs, and the Bronco All Terrain Tracked Carrier of Singapore.

A highly specialised development is the ARKTOS Craft, that uses a linkage with two joints to connect the two units and each unit having independent drive systems, giving enhanced mobility and redundancy. They are capable of climbing large ice steps from open water. [27]

Deep fording

German Leopard 2A4 with turret snorkel, 2010 Leopard 2A4 - Turm.jpg
German Leopard 2A4 with turret snorkel, 2010

Some military vehicles are capable of "wading" using waterproof screens to keep the upper hull dry. In World War II the tanks following the Sherman DDs were given waterproofed hulls and trunking was fixed to the engine intakes and exhausts to allow them to come ashore from landing craft in shallow water. The Germans gave their Tiger tank a long snorkel, essentially a long tube on the commander's hatch that allowed it to wade through four metres of water.

The Leopard 2 tank can use a series of rings to create a long tube. This tube is then fitted to the crew commander's hatch and provides air and an escape route for the crew. The height of the tube is limited to around three meters.

The Russian T-90 tank is also able to perform deep fording operations. The Russian snorkel is only a few inches around and does not provide a crew escape path, but it can be stored on the tank.

Some civilian deep wading vehicles achieve their capability by means of legs or stilts to raise the body of the vehicle from its wheels. One example is the sea tractor, a motor vehicle that can travel through shallow water, with driver and passengers on a raised platform. Another is the Brighton and Rottingdean Seashore Electric Railway, a coastline railway that ran on submerged rails through the shallow coastal waters of the English Channel between 1896 and 1901.

Hovercraft

BHC SR.N4 Mk.3, a large civilian hovercraft SRN4 Hovercraft Mountbatten Class.jpg
BHC SR.N4 Mk.3, a large civilian hovercraft

An air-cushion vehicle (ACV) or hovercraft can travel over land or water supported by a cushion of air ejected downwards against the surface below it. In principle, a hovercraft can travel over any sufficiently smooth surface: solid, liquid, mixed, or anything in between. Large hovercraft, riding on an air-cushion contained by skirts several meters tall, can deal with obstacles 1 to 2 meters in height. The smallest personal hovercraft are nimble enough to follow some rolling of the terrain.

One of the benefits of this type of amphibious craft is the possibility of making them large the British-built SR.N4 Mk.3 ferries could carry dozens of vehicles. ACVs have a high speed over water (an SR.N4 Mk.1 could do 83 knots (95 mph or 154 km/h)) and can make the transition between land and water at speed unlike most wheeled or tracked amphibians. Drawbacks are high fuel consumption and noise levels.

For some military applications wheeled and tracked amphibious vehicles are slowly being supplanted by air-cushioned landing craft. The hovercraft's ability to distribute its laden weight evenly across the surface below it makes it well suited to the role of amphibious landing craft. The US Navy LCAC can take troops and materials (if necessary an M1 Abrams tank) from ship to shore and can access more than 70% of the world's coastline, as opposed to conventional landing craft, which are only capable of landing along 17% of that coastline.

In media

The BBC television series Top Gear has, on several occasions, used amphibious vehicles as the basis for challenges. In S08E03, Clarkson, Hammond and May competed to see who could build the best amphibious car, starting with a used vehicle of their choice. Clarkson used a Toyota Hilux, which he nicknamed the "Toybota", and powered it with a large outboard motor. Hammond used a Volkswagen Vanagon, which he combined with a boat hull to build a drivable cabin cruiser called the "Dampervan". May started with a Triumph Herald and fitted it with a sail. During the challenge, which was to drive across a reservoir, the Toybota made it almost all the way to the end before capsizing, the Dampervan immediately sank, and the Triumph was the only vehicle to complete the trip, although it took a very long time to do so.

The show returned to the concept in S10E02, when the presenters built updated versions of their designs with lessons learned from the first time. Clarkson built his "Nissank" out of a Nissan Hardbody, the overall design being very similar to the Toybota, but now with oil drums as stabilizers. Hammond built a near-identical Dampervan, which had many of the same problems as its predecessor. May used the same actual vehicle as before, with only minor improvements (including a retractable daggerboard). The challenge was to drive the cars across the English Channel. Both Hammond and May's vessels sank shortly after departing, and all three presenters ended up making the trip aboard Clarkson's vehicle. Along the way, they attempted to beat Richard Branson's world record for crossing the channel in an amphibious vehicle, but failed. The pickup truck successfully crossed the channel and landed in France, although they ended up in Sangatte instead of Calais, their intended destination.

Top Gear USA featured a very similar challenge in S04E06. Their vehicles were a Volkswagen Golf, which Rutledge Wood combined with a Sea Ray boat; a Jeep Wrangler YJ, which Adam Ferrara turned into an airboat; and a Plymouth Conquest, which Tanner Foust turned into a speedboat called the "Turboat". In the initial tests, the VW had issues on both water and land, the Jeep worked well on water but not on land (the airboat motor left him stranded on the highway), and the Turboat performed well on land but sank immediately in the water. The Jeep sank as well after Foust and Ferrara got into an impromptu sea battle. All three presenters then attempted to cross Lake Ontario in the VW. Foust abandoned the trip halfway through, being picked up by a friend's yacht. Wood and Ferrara made it to the Canadian border, but were turned away because they did not bring passports.

See also

Related Research Articles

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An amphibious aircraft or amphibian is an aircraft that can take off and land on both solid ground and water. Fixed-wing amphibious aircraft are seaplanes that are equipped with retractable wheels, at the expense of extra weight and complexity, plus diminished range and fuel economy compared to planes designed for land or water only. Some amphibians are fitted with reinforced keels which act as skis, allowing them to land on snow or ice with their wheels up.

Landing craft Seagoing watercraft

Landing craft are small and medium seagoing watercraft, such as boats and barges, used to convey a landing force from the sea to the shore during an amphibious assault. The term excludes landing ships, which are larger. Production of landing craft peaked during World War II, with a significant number of different designs produced in large quantities by the United Kingdom and United States.

Floatplane Aircraft equipped with floats for operation from water surfaces

A floatplane is a type of seaplane with one or more slender floats mounted under the fuselage to provide buoyancy. By contrast, a flying boat uses its fuselage for buoyancy. Either type of seaplane may also have landing gear suitable for land, making the vehicle an amphibious aircraft. British usage is to call "floatplanes" "seaplanes" rather than use the term "seaplane" to refer to both floatplanes and flying boats.

Hydrocopter Amphibious propeller-driven catamaran with a boat-like hull, small wheels and pontoon skis

A hydrocopter is an amphibious propeller-driven catamaran with a boat-like hull, small wheels and pontoon skis. An aircraft engine with a propeller and air rudder powers the vehicle over water, ice, snow and land.

Landing Vehicle Tracked Amphibious vehicle

The Amphibious Vehicle, Tracked (LVT) is an amphibious warfare vehicle and amphibious landing craft, introduced by the United States Navy and United States Marine Corps. The United States Army, Canadian Army and British Army used several LVT models during World War II, and referred to those vehicles as "Landing Vehicle, Tracked."

Gibbs Aquada

The Gibbs Aquada is a high speed amphibious vehicle developed by Gibbs Sports Amphibians. It is capable of speeds over 160 kilometres per hour (99 mph) on land and 50 kilometres per hour on water. Rather than adding wheels to a boat design, or creating a car that floats, the Aquada was designed from the ground up to perform very well in both fields, with over 60 patents covering technical innovations.

Screw-propelled vehicle Vehicle propelled by load-bearing rotating helical flanges

A screw-propelled vehicle is a land or amphibious vehicle designed to cope with difficult snow and ice or mud and swamp. Such vehicles are distinguished by being moved by the rotation of one or more auger-like cylinders fitted with a helical flange that engages with the medium through or over which the vehicle is moving. Modern vehicles called Amphirols and other similar vehicles have specialised uses.

Type 92 Heavy Armoured Car weapon

The Type 92 Heavy Armoured Car, also known as the Type 92 cavalry tank, was the Empire of Japan's first indigenous tankette. Designed for use by the cavalry of the Imperial Japanese Army by Ishikawajima Motorcar Manufacturing Company, the Type 92 was designed for scouting and infantry support. Although actually a light tank, it was called sōkōsha in Japanese due to political sectionalism within the Japanese Army. Exactly the same device was used in America with the M1 Combat Car.

Gibbs Quadski

The Gibbs Quadski is an amphibious quad bike/ATV, launched in October 2012 by Gibbs Sports Amphibians.

The Gibbs Humdinga is a high speed amphibious vehicle concept designed by Gibbs Technologies. It was publicly announced in February 2012 and was created specifically to access remote and hostile terrain. It uses the same High Speed Amphibian (HSA) technology as the Gibbs Aquada. It has yet to be sold to the public.

Amphibious ATV

An amphibious all-terrain vehicle, amphibious ATV, is a small, all-wheel drive, all-terrain amphibious vehicle, used for recreation, farm-, hunting, utility or industry tasks, by enthusiasts and professionals worldwide. They are legally off-highway vehicles in many countries, or at least restricted from use on express highways and motorways – their use is generally extra-urban.

Nicholas Straussler

Nicholas Peter Sorrel Straussler was an engineer mainly remembered for devising the flotation system used by Allied amphibious DD tanks during World War II. Born in Hungary, he developed a reputation as an innovative automotive engineer before becoming a British citizen during the interwar period. His work was mainly to do with amphibious, off-road and military vehicles.

PTS (vehicle) Motor vehicle

The PTS is a Soviet tracked amphibious transport. PTS stands for Plavayushchij Transportyer - Sryednyj or medium amphibious transport vehicle. Its industrial index was Ob'yekt 65.

Amphibious warfare ship Ship used in amphibious warfare

An amphibious warfare ship is an amphibious vehicle warship employed to land and support ground forces, such as marines, on enemy territory during an amphibious assault.

Amphibious helicopter

An amphibious helicopter is a helicopter that is intended to land on and take off from both land and water. Amphibious helicopters are used for a variety of specialized purposes including air-sea rescue, marine salvage and oceanography, in addition to other tasks that can be accomplished with any non-amphibious helicopter. An amphibious helicopter can be designed with a waterproof or water-resistant hull like a flying boat or it can be fitted with utility floats in the same manner as a floatplane.

Amphibious automobile

An amphibious automobile is an automobile that is a means of transport viable on land as well as on or under water. They are unarmored for civilian use.

Sealegs Amphibious Craft Motor vehicle

Sealegs Amphibious Craft are a type of amphibious vehicle manufactured by Sealegs International Ltd, a company based in Auckland, New Zealand. Sealegs craft are aluminium fabricated boats fitted with either a hydraulic amphibious system or an electric amphibious system. Both amphibious systems consist of three wheels – one fitted to the bow and two fitted to the transom of the craft. In craft with the hydraulic system, these wheels are lifted, lowered and driven by the hydraulic system which is powered by a petrol engine mounted on the deck. In craft with the electric system, the wheels are equipped with brushless high-torque electric motors, and powered by a central 48-volt 7-kWh lithium battery pack.

Airoll is a system of vehicle propulsion that attempts to combine the strengths of air filled tires with those of caterpillar tracks to create an all-terrain amphibious vehicle while maintaining a reasonable speed and payload capacity. First conceived in the 18th century, the concept was still a novelty in the mid 20th century, which saw rapid development of the idea into practical vehicles by the United States, the Soviet Union, and multiple civilian enterprises. The most notable of these vehicles is perhaps the XM769 Marginal Terrain Vehicle, which is on display at the Marine Corps Mechanized Museum at Camp Pendleton, California.

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Further reading