||It has been suggested that Tilting three-wheeler be merged into this article. (Discuss) Proposed since December 2014.|
|This article needs additional citations for verification. (January 2012)|
A three-wheeler is a vehicle with three wheels, either "human or people-powered vehicles" (HPV or PPV or velomobiles) or motorized vehicles in the form of a motorcycle, all-terrain vehicle (ATV) or automobile. Other names for three-wheelers include trikes, tricars and cyclecars. The term tricycle is used somewhat interchangeably, but the term three-wheeler is more often applied to motor vehicles. They can be legally classed as either automobiles or motorcycles.
Many three-wheelers which exist in the form of motorcycle-based machines are often called trikes and often have the front single wheel and mechanics similar to that of a motorcycle and the rear axle similar to that of a car. Often such vehicles are owner-constructed using a portion of a rear-engine, rear-drive Volkswagen Beetle in combination with a motorcycle front end. Other trikes include ATVs that are specially constructed for off road use. Three-wheeled automobiles can have either one wheel at the back and two at the front, (for example: Morgan Motor Company) or one wheel at the front and two at the back (such as the Reliant Robin).
Due to its superior safety when braking, an increasingly popular form is the front-steering "tadpole" or "reverse trike" sometimes with front drive but usually with rear drive. A variant on the 'one at the front' layout was the Scott Sociable, which resembled a four-wheeler with a front wheel missing.
Three-wheeler cars, usually microcars, are often built for economic reasons: in the UK for tax advantages, or in the US to take advantage of lower safety regulations, being classed as motorcycles. As a result of their light construction and potential better streamlining, three-wheeled cars are usually very economical to run.
Three-wheeler transport vehicles known as Auto Rickshaws are a common means of public transportation in many countries in the world. Auto rickshaws are an essential form of urban transport in many developing countries such as India, and a form of novelty transport in many Eastern countries.
In 1897, Edward Butler (inventor) made the Butler Petrol Cycle, another three-wheeled car.
A photograph of the 1885 Benz Patent Motorwagen.
Goliath Tempo pickup truck at a meeting for vintage cars in the Nineties
Davis 494, at the National Automotive and Truck Museum, Auburn, IN
A configuration of two wheels in the front and one wheel at the back presents two advantages : it has improved aerodynamics, and that it readily enables small lightweight motorcycle powerplant and rear wheel to be used. This approach was used by Messerschmitt kr200 and by the BMW Isetta. Alternatively, a more conventional front-engine, front wheel drive layout as is common in four-wheeled cars can be used, with subsequent advantages for transversal stability (further front location of CG) and traction (two driven wheels instead of one).
For the lowest wind resistance (which increases fuel efficiency), a teardrop shape is desirable. A teardrop is wide and round at the front, tapering at the back. The three-wheel configuration allows the two front wheels to create the wide round surface of the vehicle. The single rear wheel allows the vehicle to taper at the back. This approach is used by the Aptera 2 Series. This idea has also been used by Elio Motors to develop a new low cost, high fuel mileage vehicle to be released in 2015. It is also used by Myers Motors for both its single passenger NmG and upcoming 2-passenger Duo.
Having one wheel in front and two in the rear for power reduces the cost of the steering mechanism, but greatly decreases lateral stability when cornering while braking.
The disadvantage of a three-wheel configuration is lateral instability - the car will tip over in a turn before it will slide. This can be prevented in 3 different ways:
- by placing the centre of mass much closer to the ground,
- by placing the centre of mass closer to the 2 rear wheels, or
- by significantly increasing the rear track width.
In the case of a three wheeled ATV, tipping can be avoided by the rider leaning into turns.
To improve stability some three-wheelers are designed as tilting three-wheelers so that they lean while cornering like a motorcyclist would do. The tilt may be controlled manually, mechanically or by computer.
A tilting three-wheeler's body and or wheels tilt in the direction of the turn. Such vehicles can corner safely even with a narrow track.
Several configurations are practical. Two front wheels and one rear, where all three wheels tilt, use the acronym 2F3T (i.e. two front three tilt). Other variations 1F1T, where only the front wheel tilts, an example being the Vandenbrink Carver, made in the Netherlands.
Active or passive tilt control
Tilting can be actively controlled by applying force between the paired wheels. A "free leaner" is balanced by steering, like a single track vehicle. This still leaves some advantages in traction, and the tilt can be locked for parking faster than a stand can be deployed.
Propulsion may be on one, two, or three wheels, tilted or not. Many possible arrangements require particularly flexible U-joints, which favours the other possibilities.
Use of 'extra' wheel
Any extra laterally spaced wheel can benefit the vehicle by providing stability gains if there is a mechanism to lock the laterally spaced wheels at any given moment relative to the road plane. In some countersteered vehicles this benefit is generally only available when stopped.
In other types where the tilt angle is directly controlled this additional stability is constant at all speeds.
In a countersteered vehicle a loss of traction will result in a fall whereas in a tilt controlled design a fall may not occur.
Due to the tilting, there is not necessarily any load transfer between the wheels in cornering, so the rule about tadpoles (2F or "reverse trike") understeering and Deltas (1F or standard trike) oversteering does not necessarily apply
In the U.S the National Highway Traffic Safety Administration defines and regulates three-wheeled vehicles as motorcycles. Licensing requirements vary on a state-by-state basis. In other jurisdictions, such as British Columbia, Canada, and Connecticut, a three-wheeled vehicle with an enclosed passenger compartment or partially enclosed seat is considered an automobile.
When the single wheel is in the front (the "delta" form, as in a child's pedal tricycle), the vehicle is inherently unstable in a braking turn, as the combined tipping forces at the center of gravity from turning and braking can rapidly extend beyond the triangle formed by the contact patches of the wheels. This type, if not tipped, also has a greater tendency to spin out ("swap ends") when handled roughly.
With two wheels in the front (the "tadpole" form or "reverse trike") the vehicle is far more stable in braking turns, but remains more prone to overturning in normal turns compared to an equivalent four-wheeled vehicle, unless the center of mass is lower and/or further forward. Motorcycle-derived designs suffer from most of the weight being towards the rear of the vehicle.
Due to the incidence of injuries related to their use, a 10-year ban, entirely voluntary for manufacturers, was placed on the sale of new three-wheeled ATVs in the United States in January 1988. However, it should be noted that more injuries were sustained by riders by not applying a proper riding technique, and lack of wearing proper safety gear such as helmets and riding boots. In a search conducted by the Consumer Product Safety Commission, it was determined that "no inherent flaw was found in the three wheel design".
In popular culture
In the British TV series Mr. Bean, a Reliant Regal three-wheeler was often driving around town. The car was sort of a nemesis to Mr. Bean, as he would drive in such a manner as to cause the car to roll over and even refused a ride from the three-wheeler when hitchhiking.
|Léon Bollée Voiturette||France||1895-?|
|Advance 6 hp air-cooled Tri Car and 9 hp water-cooled Tri Car||England||1902-12|
|Riley Olympia Tricar||England||1904|||
|Lagonda Tricar||England||1904-07||total production: 69 cars|
|Morgan V-Twin and F-Series||England||1911-39, 1932–52||Morgan Super Sports 2-Seater 1937|
|American Tri-Car||United States||1912|
|Birmingham Small Arms Company Three Wheeler||England||1929-36||1100cc engine|
|Zaschka||Germany||1929||Folding three-wheeler: Zaschka Three-wheeler 1929|
|Dymaxion car||United States||1933||Concept car designed by Buckminster Fuller|
|Mathis VEL 333||France||1946||3 seats, flat-twin front engine, aluminium body, production less than 10 units|
|Velorex Oskar and other models||Czechoslovakia||1951-71||Originally with leather bodies|
|Isetta||UK||1957-62||Three-wheeled version of the Isetta built in the UK to take advantage of tax and licencing regulations|
|Peel P50||Isle of Man||1963-64||Smallest production car ever built|
|HM Vehicles Free-way||United States||1979-82|
|Campagna T-Rex||Canada||1996–present||Most likely the fastest (157 mph) most expensive ($50k MSRP) production 3-wheeler|
|Malone Car Company F1000|Skunk SS|TAZR||United Kingdom||1999–present||High power internal combustion and pure electric versions released November 2010|
|Cree SAM||Switzerland||2001||Electric, only 80 produced|
|Scoot Coupe||United States||2004–present||Smallest production car currently, requiring no license to operate due to its moped drive-train|
|Myers Motors NmG ("No more Gas")||United States||2006–present||Single occupant all-electric plug-in: 75 mph, 50-60 mile range, lithium batteries. Developed from Corbin Sparrow. The 2-passenger model, the Duo, is scheduled for release in 2010.|
|Can-Am Spyder Roadster||Canada||2007-present||The Can-Am Spyder is a three-wheeled motorcycle manufactured by Bombardier Recreational Products.|
|Moonbeam||United States||2008–present||100 mpg DIY, fabric-covered car based on parts from two Honda 150cc motorscooters|
|Triac||United States||2009-2011||Electric, never entered production|
|XR-3 Hybrid||United States||Plans-2008, Kit-2009||Front 3 cylinder diesel (125 mpg), rear electric 40 mile range -(220 mpg when used as a hybrid)|
|Aptera 2e||United States||Electric or Plug-in hybrid, 300 mpg-US (0.78 L/100 km)|
|Triton Trikes||United States||2000-current||Gas power 42+ mpg - Parts lists, customize, Kits Available - call for info|
|Elio Motors||Shreveport, LA, United States||Begins 1H 2016||Two passenger fully enclosed cockpit with car controls so no need for helmet or motorcycle endorsement in most states; $6800, 84/49 mpg; A/C, power windows/lock, AM/FM stereo, and 3 airbags standard; 0-60 <10 sec; 5 star safety rated; Front-wheel_drive w/ F-1 style front suspension|
|Go3Wheeler||United States||2014||80 mpg single person three wheeler 420cc 16 Horsepower RWD $3000 for a kit. w/ F-1 style front suspension Roll cage.|
|Benz Patent Motorwagen||Germany||1886-93|
|La Va Bon Train||France||1904-10||50-100 believed built|
|Davis D-2 Divan||United States||1947-48||about 13-17 built, including the 494, a Jeep-like military vehicle|
|Kia K-360||Republic of Korea||1962-1973||356 cc, 11 hp, air-cooled two cylinder. Top speed 65 km/h and a maximum load of 300 kg. This was Kia's first truck. The spare wheel was located on the roof.|
|Kia T-1500||Republic of Korea||1963-?||1484 cc, 60 hp, four cylinder and a maximum load of 1.5 tons.|
|Kia T-600||Republic of Korea||1969-1974||577cc, 20 HP and 500 kg load. Top speed of 75 km/h. 7726 produced.|
|Kia T-2000||Republic of Korea||1967-1981||1985 cc, 81 hp, four cylinder and a maximum load of 2 tons. 15952 produced.|
|Electra-King||United States||1964?-1980s?||Two-seater electric car manufactured by B & Z Electric Car Company|
|Reliant Robin||England||1973-81, 1989-2002|
|GM Lean Machine||United States||1980s||Tilt, concept car only, conceived by Frank Winchell|
|ZAP Xebra||United States||2006-2009||electric power|
|eTuk USA, LLC ||United States||2014||eTuk USA have taken the tuk tuk, which is omnipresent in Asian cities, and re-designed it for the US Market, including an all-electric motor. visit their website (www.etukusa.com) to see the vehicle line-up ranging from 3/6 passenger vehicles and small food/vending trucks.|
|Snyder ST600-C||United States||20??-20??|
- Auto rickshaw
- Bubble car
- Cabin cycle
- Corbin Sparrow
- Davis Motorcar Company
- Egy-Tech Engineering
- Electric trike
- Feet forwards motorcycle
- Goliath (car)
- Harley-Davidson Servi-Car
- Motorized tricycle (Philippines)
- Myers Motors NmG
- Piaggio MP3
- Steam tricycle
- T-Rex (automobile)
- Volkswagen 1-litre car
- Volkswagen GX3
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- Phil Patton, "A Dreamer's Machine, More Promise Than Reality", New York Times (September 24, 2009)
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