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Car body configurations

From Wikipedia, the free encyclopedia

Typical pillar configurations of a sedan (three box), station wagon (two box), and hatchback (two box) from the same model range.
Typical pillar configurations of a sedan (three box), station wagon (two box), and hatchback (two box) from the same model range.

The configuration of a car body is typically determined by the layout of the engine, passenger and luggage volumes. These three volumes can be shared or separate volumes. Often when they are separated, the boundaries are the A-pillar, B-pillar or C-pillar.

Common car body configurations are one-box (eg a van), two-box (eg a hatchback) and three-box (eg a sedan) designs.

One-box design

Renault Twingo (circa 2002)
Renault Twingo (circa 2002)

A one-box design—also called a monospace, mono-box or monovolume configuration[1]—gives the impression of a car being a single volume combining engine, cabin and cargo areas. This is achieved in a design that pulls the base of a vehicle's A-pillars forward, creating an impression of spaciousness.[1][2]

Most light commercial vehicles and minivans are one-box designs. Passenger cars with a one-box design include the 1984 Renault Espace, 1992 Renault Twingo I, Tata Nano and 1997-2004 Mercedes-Benz A-Class.

Two-box design

Two-box designs articulate a volume for engine and a volume that combines passenger and cargo volumes, e.g., station wagons or (three or five-door) hatchbacks, and minivans like the Chrysler minivan.[1][2]

Three-box design

Three-box design is a broad automotive styling term describing a coupé, sedan, notchback or hatchback where—when viewed in profile—principal volumes are articulated into three separate compartments or boxes: engine, passenger and cargo.[1]

Three-box designs are highly variable. Hemmings Motor News said:

These three boxes, compartmentalized as they are, are used to denote distinct areas of an automobile--specifically a sedan. The engine under the hood and surrounding compartment is the first box. The passenger seating area is another, or second box. The last or third box is the cargo or trunk area. There is no rule as to which box needs to be where.[3]

Where the Renault Dauphine is a three-box that carries its engine in the rear and its cargo up front, the styling of the Škoda Octavia integrates a hatchback with the articulation of a three-box. This style was later used by its larger Škoda Superb, which marketed as the TwinDoor, within the liftgate operable as a trunk lid or as a full hatchback. As with the third generation European Ford Escort (also a hatchback), the third box may be vestigial. And three-box styling need not be boxy: Car Design News calls the fluid and rounded Fiat Linea a three-box design[4]—and most examples of the markedly bulbous styling of the ponton genre are three-box designs.

In 2012, Hemmings Motor News wrote "the three-box sedan design is seen as traditional or--worse--conventional."[3] By 2016 In the United States, the three-box sedan began to wane in popularity.[5][6] In 2018, the Wall Street Journal wrote: "from gangster getaway cars and the Batmobile to the humble family sedan, the basic three-box configuration of a passenger car—low engine compartment, higher cabin, low trunk in the rear—has endured for decades as the standard shape of the automobile. Until now."[5]

Sales and popularity of 4-door notchback sedans (saloons) began declining in Europe since mid-1990s, especially affordable ones. This is resulted in moving production of Volkswagen Jetta in Mexico, as well as the Peugeot abandoning that segment since 2001 when the production of Peugeot 306 ended. Other, predominatly European manufacturers followed suit, with the most recent generation of Opel Astra may no longer to be offered as the 4-door notchback. Since 2018, Ford reduced sales of 4-door Focus as well as Mondeo to Eastern Balkans markets. Again, Volkswagen stopped sales of Jetta in Europe around the same time due to too long dimensions, exceeding those with International Passat B8.

Car roof classification

A related classification is based on the style of roof in the car design. The DrivAer aerodynamics model of the Technical University of Munich[7] classifies roof styles as (i) Fastback, (ii) Estateback, (iii) Sedan.[8]

See also

References

  1. ^ a b c d "Starting Out: Car Design Glossary - Part 2 pg 3". www.cardesignnews.com. Retrieved 31 May 2018.
  2. ^ a b Mike Mueller (2003). American Cars of the '50s. Crestline Imprints. ISBN 0-7603-1712-7.
  3. ^ a b "Compartmentalized Cars, Boxes and boxes on boxes: the basis of the three-box design". Hemmings Motor News.
  4. ^ "Fiat Linea". Car Design News. Archived from the original on 2011-07-27. Retrieved 2010-08-06.
  5. ^ a b "America Has Fallen Out of Love With the Sedan". Wall Street Journal.
  6. ^ "On the Death of the Sedan". Car and Driver.
  7. ^ "DrivAer Model".
  8. ^ "Lehrstuhl für Aerodynamik und Strömungsmechanik: Geometry". www.aer.mw.tum.de. Retrieved 22 March 2019.
This page was last edited on 27 September 2019, at 11:21
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