Car body configurations

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Typical pillar configurations of a sedan/saloon (three box), station wagon/estate (two box), and hatchback (two box) from the same model range Three body styles with pillars and boxes.png
Typical pillar configurations of a sedan/saloon (three box), station wagon/estate (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 compartments, which can be shared or separately articulated. A key design feature is the car's roof-supporting pillars, designated from front to rear of the car as A-pillar, B-pillar, C-pillar and D-pillar.

Contents

Common car body configurations are one-box (e.g., a van/minivan/MPV), two-box (e.g., a hatchback/SUV) and three-box (e.g., a sedan/saloon) designs.

One-box design

A one-box design, the Renault Twingo (1998-2000) Renault Twingo front 20080222.jpg
A one-box design, the Renault Twingo (1998–2000)

A one-box design, also called a monospace, mono-box or monovolume configuration [1] —approximates in shape a single volume comprising engine, cabin and cargo areas, in part by locating the base of a vehicle's A-pillars further forward. [1] [2]

One-box designs include light commercial vehicles, minivans, MPVs and mini MPVs. Passenger cars with a one-box design include the 1984 Renault Espace, 1992 Renault Twingo I, 2008 Tata Nano, 2005 Toyota Aygo/Citroën C1/Peugeot 107 and 1997 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 wagon/estate or (three or five-door) hatchbacks like the Saab 900, and minivans like the Chrysler Pacifica, 2001 Volkswagen Polo Mk4 and 1999 Skoda Fabia Mk1. [1] [2]

Three-box design

A three-box coupe, the Fiat 124 Three box notchback Fiat 124.jpg
A three-box coupé, the Fiat 124
A three-box hatchback, the European Ford Escort Hatchback three box.jpg
A three-box hatchback, the European Ford Escort
A three-box sedan/saloon, the Renault Dauphine Three-box & rear engine.jpg
A three-box sedan/saloon, the Renault Dauphine

Three-box design is a broad automotive styling term describing a coupé, sedan/saloon, 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 does not need to 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 four-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, predominantly European manufacturers followed suit, with the most recent generation of Opel Astra may no longer to be offered as the four-door notchback. Since 2018, Ford reduced sales of four-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 (F) Fastback, (E) Estate Back, (N) Notchback/Sedan. [8]

Motorsport applications

The bodies of stock cars can be modified for motorsport purposes while retaining their main characteristics. The DrivAer high-performance (hp) configuration, [9] a parametric academic model, provides an open-source wind tunnel dataset and serves as a benchmark, particularly valuable when combined with the original DrivAer Fastback (F) variation variant for aerodynamic analysis. Aero kits applied are in line with those found in motorsport categories like European DTM and American NASCAR series.

See also

Related Research Articles

<span class="mw-page-title-main">Minivan</span> Type of van designed for private use

Minivan is a car classification for vehicles designed to transport passengers in the rear seating row(s), with reconfigurable seats in two or three rows. The equivalent classification in Europe is MPV or M-segment.

<span class="mw-page-title-main">Van</span> Covered transportation vehicle

A van is a type of road vehicle used for transporting goods or people. Depending on the type of van, it can be bigger or smaller than a pickup truck and SUV, and bigger than a common car. There is some variation in the scope of the word across the different English-speaking countries. The smallest vans, microvans, are used for transporting either goods or people in tiny quantities. Mini MPVs, compact MPVs, and MPVs are all small vans usually used for transporting people in small quantities. Larger vans with passenger seats are used for institutional purposes, such as transporting students. Larger vans with only front seats are often used for business purposes, to carry goods and equipment. Specially equipped vans are used by television stations as mobile studios. Postal services and courier companies use large step vans to deliver packages.

<span class="mw-page-title-main">Station wagon</span> Auto body-style with its roof extended rearward

A station wagon or estate car, is an automotive body-style variant of a sedan with its roof extended rearward over a shared passenger/cargo volume with access at the back via a third or fifth door, instead of a trunk/boot lid. The body style transforms a standard three-box design into a two-box design—to include an A, B, and C-pillar, as well as a D-pillar. Station wagons can flexibly reconfigure their interior volume via fold-down rear seats to prioritize either passenger or cargo volume.

<span class="mw-page-title-main">Hatchback</span> Car body configuration with a rear door

A hatchback is a car body configuration with a rear door that swings upward to provide access to the main interior of the car as a cargo area rather than just to a separated trunk. Hatchbacks may feature fold-down second-row seating, where the interior can be reconfigured to prioritize passenger or cargo volume.

<span class="mw-page-title-main">Volkswagen Polo</span> Motor vehicle

The Volkswagen Polo is a supermini car (B-segment) produced by the German car manufacturer Volkswagen since 1975. It is sold in Europe and other markets worldwide in hatchback, saloon, and estate variants throughout its production run.

<span class="mw-page-title-main">Sedan (automobile)</span> Passenger car in a three-box configuration

A sedan or saloon is a passenger car in a three-box configuration with separate compartments for an engine, passengers, and cargo. The first recorded use of sedan in reference to an automobile body occurred in 1912. The name derives from the 17th-century litter known as a sedan chair, a one-person enclosed box with windows and carried by porters. Variations of the sedan style include the close-coupled sedan, club sedan, convertible sedan, fastback sedan, hardtop sedan, notchback sedan, and sedanet.

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<span class="mw-page-title-main">Volkswagen Type 3</span> Compact car built from 1961 to 1973

The Volkswagen Type 3 is a compact car manufactured and marketed by Volkswagen from 1961 to 1973. Introduced at the 1961 Frankfurt International Motor Show, the IAA, the Type 3 was marketed as the Volkswagen 1500 and later as the Volkswagen 1600, in two-door Notchback, Fastback, and Variant body styles, the latter marketed as the 'Squareback' in the United States.

<span class="mw-page-title-main">Notchback</span> Type of car design

A notchback is a car design with the rear section distinct from the passenger compartment and where the back of the passenger compartment is at an angle to the top of what is typically the rear baggage compartment. Notchback cars have "a trunk whose lid forms a distinct deck." In profile view, the body has a step down from the roof with a downward inclined passenger compartment's rear window to meet an almost horizontal trunk lid extending to the rear of the car.

<span class="mw-page-title-main">Chevrolet Lumina APV</span> Motor vehicle

The Chevrolet Lumina APV is a minivan that was produced by the Chevrolet division of General Motors. The first front-wheel drive minivan sold by Chevrolet, the Lumina APV was sold in a single generation from the 1990 to 1996 model years. Marketed alongside the Pontiac Trans Sport and Oldsmobile Silhouette, the Lumina APV competed against the Dodge Grand Caravan/Plymouth Grand Voyager, the extended-length Ford Aerostar, and the Mazda MPV.

<span class="mw-page-title-main">C-segment</span> European car size classification

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<span class="mw-page-title-main">Sliding door (car)</span> Type of vehicle door

A sliding door is a type of door that is mounted on or suspended from a track for the door to slide, usually horizontally and outside. It is a feature predominantly found in minibuses, buses, and vans, so as to allow a large unobstructed access to the interior for loading and unloading of passengers or cargo without the doors interfering with adjacent space.

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The VAM Lerma is an automobile that was designed and manufactured by Vehiculos Automotores Mexicanos from 1981 to 1983. The Lerma shared parts with other vehicles by VAM's license partner American Motors (AMC) to reduce manufacturing costs. It was VAM's top-of-the-line flagship model after the discontinuation of the Classic (Matador) line in 1976. The VAM Lerma was unusual in offering a hatchback design focused at the top-end luxury market. The model was an indirect replacement of the VAM Classic and to some extent the VAM Pacer lines.

<span class="mw-page-title-main">Volkswagen Jetta (A1)</span> Motor vehicle

The Volkswagen Jetta A1 is the first generation of the Volkswagen Jetta compact car, produced by Volkswagen. Although the Golf reached considerable success in the North American markets, Volkswagen observed the hatchback body style lacked some of the appeal to those who preferred the traditional three-box configuration. The styling of the 1970 AMC Gremlin was controversial for truncating the Hornet sedan, but Volkswagen stylists reversed the process by essentially grafting a new trunk onto the tail of the Golf to produce a larger Jetta saloon. The Jetta became the best-selling European car in the United States, Canada and Mexico. Sales were slower in Europe, but were strong enough for Volkswagen to develop future generations of the Jetta.

References

  1. 1 2 3 4 "Starting Out: Car Design Glossary - Part 2 pg 3". www.cardesignnews.com. Archived from the original on 4 March 2016. Retrieved 31 May 2018.
  2. 1 2 Mike Mueller (2003). American Cars of the '50s. Crestline Imprints. ISBN   0-7603-1712-7.
  3. 1 2 "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. 1 2 "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". www.epc.ed.tum.de. Retrieved 26 December 2021.
  8. "DrivAer Model: Geometry". www.epc.ed.tum.de. Retrieved 26 December 2021.
  9. "SAE MOBILUS". saemobilus.sae.org. Retrieved 2023-12-21.