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The Dymaxion car was a concept car designed by U.S.marker inventor and architect Buckminster Fuller during 1933. The word Dymaxion is a brand name that Fuller gave to several of his inventions, to emphasize that he considered them part of a more general project to improve humanity's living conditions. The car had a fuel efficiency of . It could transport 11 passengers. While Fuller claimed it could reach speeds of , the fastest documented speed was .

Isamu Noguchi was involved with the development of the Dymaxion car, creating plaster wind tunnel models that were a factor in determining its shape, and during 1934 drove it for an extended road trip through Connecticutmarker with Clare Boothe Luce and Dorothy Hale.

The car was a three wheeler, steered by a single rear wheel, and could do a U-turn in its own length. However, the rear-wheel steering made the car somewhat counterintuitive to operate, especially in crosswind situations. The body was teardrop-shaped, and naturally aerodynamically efficient. The car was twice as long as a conventional automobile, at long. Drive power was provided by a rear-mounted Ford V8 engine, which produced through the front wheels. The front axle was also a Ford component, being the rear axle of a contemporary Ford roadster turned upside-down.

An accident at the 1933 Chicago world's fairmarker damaged the first prototype badly, killing the driver, and seriously injuring the two passengers. The Dymaxion had rolled over, and although the driver was wearing a seatbelt, the prototype's canvas roof had not offered sufficient crash protection. The cause of the accident was not determined, although Buckminster Fuller reported that the accident was due to the actions of another vehicle that had been following the Dymaxion closely. The crash prompted investors to abandon the project, blaming the accident on deficiencies of the vehicle's steering.

In his 1988 book The Age of Heretics, author Art Kleiner maintained that the real reason why Chrysler refused to produce the car was because bankers had threatened to recall their loans, feeling that the car would destroy sales for vehicles already in the distribution channels and second-hand cars.

Although the Dymaxion cars were not produced, the design was influential on several subsequent designs. The VW Transporter van of the late 1940s resembled the Dymaxion slightly, being a multi-seat mini-van with an aerodynamic body. Buckminster Fuller's Dymaxion concept of obtaining optimal efficiency by aerodynamic design and employing the most advantageous materials, although obvious, may have especially influenced such designs as the Aptera hybrid car prototype , which, like the Dymaxion, is a three wheeled, ultra light, aerodynamic, fuel efficient vehicle design.

Of the three prototype cars built, only the second prototype survives, located in the Harrah Collection of the National Automobile Museummarker in Reno, Nevadamarker. The exterior has been restored, though it is a hollow shell, as they did not know what the Dymaxion's interior was like.

As of September 2009, the one surviving Dymaxion is undergoing a partial interior restoration by the company Crosthwaite and Gardiner, with the help from the collective knowledge of fans at Synchronofile.com .

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