73-646: The BYD S8 is a convertible sports car manufactured by the Chinese car company BYD . First shown as a prototype at the Shanghai Motor Show in 2006 as the F8. The vehicle has a steel roof and the design shares similarities at the rear with the conceptually similar Renault Mégane CC while the front is reminiscent of the Mercedes-Benz CLK . The BYD S8 is front-wheel drive and is powered by
146-447: A convertible top. Often the driver is separated from the rear passengers with a partition, as per a limousine . In the second half of the 20th century, landaulets were used by public figures (such as heads of state) in formal processions. They are now rarely used, for fear of terrorist attacks. Victoria-Cabriolet: reminiscent of the victoria carriage style , a three-position convertible. No rear side windows and equipped with
219-593: A monocoque shell and more like a bowl. One thousand were produced. A key role in developing the unitary body was played by the American firm the Budd Company, now ThyssenKrupp Budd . Budd supplied pressed-steel bodywork, fitted to separate frames, to automakers Dodge , Ford , Buick , and the French company, Citroën . In 1930, Joseph Ledwinka , an engineer with Budd, designed an automobile prototype with
292-478: A "U" and may be either right-side-up or inverted, with the open area facing down. They are not commonly used due to weakness and a propensity to rust. However, they can be found on 1936–1954 Chevrolet cars and some Studebakers . Abandoned for a while, the hat frame regained popularity when companies started welding it to the bottom of unibody cars, effectively creating a boxed frame. Originally, boxed frames were made by welding two matching C-rails together to form
365-489: A 4-cylinder 2.0-litre engine. The S8 was mainly sold in China. In 2009 the car sold in 96 units, and only seven cars were sold in the full 2010 fiscal year. Production has now ceased. In all, the car sold in only 103 units. Convertible A convertible or cabriolet ( / ˌ k æ b r i oʊ ˈ l eɪ / ) is a passenger car that can be driven with or without a roof in place. The methods of retracting and storing
438-681: A convertible body style in its 1982 lines that was based on the K-Car . These models were the LeBaron , produced under Chrysler, and the 400 , manufactured under Dodge . Ford reintroduced a convertible Mustang for 1983, while American Motors Corporation (AMC) added a convertible version of the Renault Alliance in 1984. In 1989, Mazda released the first generation Mazda MX-5 (called "Miata" in North America), which has become
511-544: A folding construction framework with the actual top made from cloth or other fabric. Other types of convertible roofs include retractable hardtops (often constructed from metal or plastic) and detachable hardtops (where a metal or plastic roof is manually removed and often stored in the trunk ). Other terms for convertibles include cabriolet, cabrio, drop top, drophead coupé, open two-seater, open top, rag top, soft top, spider, and spyder, although companies use many of these terms interchangeably. Thus, nomenclatural consistency
584-540: A full unitary construction. Citroën purchased this fully unitary body design for the Citroën Traction Avant . This high-volume, mass-production car was introduced in 1934 and sold 760,000 units over the next 23 years of production. This application was the first iteration of the modern structural integration of body and chassis, using spot welded deeply stamped steel sheets into a structural cage, including sills, pillars, and roof beams. In addition to
657-490: A heating duct to the neck area of the seat, which is often called an "Air Scarf". Examples of cars with this feature include Mercedes-Benz SLK-Class , Mercedes-Benz SL-Class , and Audi A5 / S5 . Modern safety features specifically for convertibles include: Convertibles have offered numerous iterations that fall between the first mechanically simple fabric tops to complex retractable roofs made from hard materials: Roadster: A roadster (also called spider or spyder )
730-470: A ladder frame, but the middle sections of the frame rails sit outboard of the front and rear rails, routed around the passenger footwells, inside the rocker and sill panels. This allowed the floor pan to be lowered, especially the passenger footwells, lowering the passengers' seating height and thereby reducing both the roof-line and overall vehicle height, as well as the center of gravity, thus improving handling and road-holding in passenger cars. This became
803-420: A ladder, the ladder frame is one of the oldest, simplest, and most frequently used under-body, separate chassis/frame designs. It consists of two symmetrical beams, rails, or channels, running the length of the vehicle, connected by several transverse cross-members. Initially seen on almost all vehicles, the ladder frame was gradually phased out on cars in favor of perimeter frames and unitized body construction. It
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#1732793172614876-560: A lightweight, multi-tubular, triangulated frame over which an aerodynamic aluminum body was crafted. In 1994, the Audi A8 was the first mass-market car with an aluminium chassis, made feasible by integrating an aluminium space-frame into the bodywork. Audi A8 models have since used this construction method co-developed with Alcoa , and marketed as the Audi Space Frame . The Italian term Superleggera (meaning 'super-light')
949-531: A lower stack height offer a smoother silhouette for the car with the top down while concealed side rails allow room for three passengers in the back seat such as on the 1967 Rambler Rebel convertible. Rigid removable hardtops, many of which can be stored in a car's trunk/boot, have been available at least since the 1950s. These usually provide greater weatherproofing, soundproofing, and durability compared to fabric-based tops; some are available with integrated rear-window defrosters and windscreens. Examples include
1022-472: A platform frame. The frame of the Citroën 2CV used a minimal interpretation of a platform chassis under its body. In a (tubular) spaceframe chassis, the suspension, engine, and body panels are attached to a three-dimensional skeletal frame of tubes, and the body panels have limited or no structural function. To maximize rigidity and minimize weight, the design frequently makes maximum use of triangles, and all
1095-437: A rectangular tube. Modern techniques, however, use a process similar to making C-rails in that a piece of steel is bent into four sides and then welded where both ends meet. In the 1960s, the boxed frames of conventional American cars were spot-welded in multiple places down the seam; when turned into NASCAR "stock car" racers, the box was continuously welded from end to end for extra strength. While appearing at first glance as
1168-686: A simple form made of metal, frames encounter significant stress and are built accordingly. The first issue addressed is "beam height", or the height of the vertical side of a frame. The taller the frame, the better it can resist vertical flex when force is applied to the top of the frame. This is the reason semi-trucks have taller frame rails than other vehicles instead of just being thicker. As looks, ride quality, and handling became more important to consumers, new shapes were incorporated into frames. The most visible of these are arches and kick-ups. Instead of running straight over both axles , arched frames sit lower—roughly level with their axles—and curve up over
1241-431: A soft top that can be raised partway, leaving the area above the front seats folded back. This body style had a short period of popularity, mainly in the 1930s. Other names include Cabriolet/Coupé Milord (or just Milord), Calash (from Calèche ), Folding Head DHC, three-position Drop-head Coupé, or Cabriolet toit de 3 positions . Vehicle frame#Unibody A vehicle frame , also historically known as its chassis ,
1314-482: A solution. Rear windows are often part of the roof assembly. Traditionally, the rear window in a soft-top was made from plastic; however, more recently some convertibles have used glass for the rear window. A windblocker or wind deflector minimizes noise and rushing air reaching the occupants. According to the engineer responsible for the 2008 Chrysler Sebring , its windblocker reduces wind noise by approximately 11 to 12 dB . Several convertibles are available with
1387-456: A subframe). The unibody is now the preferred construction for mass-market automobiles. This design provides weight savings, improved space utilization, and ease of manufacture. Acceptance grew dramatically in the wake of the two energy crises of the 1970s and that of the 2000s in which compact SUVs using a truck platform (primarily the USA market) were subjected to CAFE standards after 2005 (by
1460-414: A top layer made of PVC, which has a specific structure depending on the vehicle model, and a lower layer made of fabric (usually cotton). The collapsible textile roof section over an articulated folding frame may include linings such as a sound-deadening layer and/or an interior cosmetic lining, to hide the frame. The folded convertible mechanism with the top is called the stack. Designs that fold down to
1533-584: A unitary body with no separate frame, the Traction Avant also featured other innovations such as front-wheel drive . The result was a low-slung vehicle with an open, flat-floored interior. For the Chrysler Airflow (1934–1937), Budd supplied a variation – three main sections from the Airflow's body were welded into what Chrysler called a bridge-truss construction. Unfortunately, this method
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#17327931726141606-543: A weaker-than-usual frame and body framework welded to the chassis to provide stiffness, in 1960, Chrysler moved from body-on-frame construction to a unit-body design for most of its cars. Most of the American-manufactured unibody automobiles used torque boxes in their vehicle design to reduce vibrations and chassis flex, except for the Chevy II , which had a bolt-on front apron (erroneously referred to as
1679-422: Is an open two-seat car with emphasis on sporting appearance or character. Initially, an American term for a two-seat car with no weather protection, usage has spread internationally and has evolved to include two-seat convertibles. Cabrio coach: A cabrio coach (also called semi-convertible ) has a retractable textile roof, similar to a traditional convertible. The difference is that a convertible often has
1752-404: Is now "considered standard in the industry". By 1960, the unitized body design was used by Detroit's Big Three on their compact cars ( Ford Falcon , Plymouth Valiant , and Chevrolet Corvair ). After Nash merged with Hudson Motors to form American Motors Corporation , its Rambler-badged automobiles continued exclusively building variations of the unibody. Although the 1934 Chrysler Airflow had
1825-408: Is now seen mainly on large trucks. This design offers good beam resistance because of its continuous rails from front to rear, but poor resistance to torsion or warping if simple, perpendicular cross-members are used. The vehicle's overall height will be greater due to the floor pan sitting above the frame instead of inside it. A backbone chassis is a type of automotive construction with chassis that
1898-572: Is rare. The term cabriolet originated from a carriage cabriolet : "a light, two-wheeled, one-horse carriage with a folding top, capable of seating two persons"; however, the term is also used to describe other convertibles. In the United Kingdom, the historical term for a two-door convertible is drophead coupé, and a four-door convertible was called an all-weather tourer . Most of the early automobiles were open-air vehicles without any roof or sides. As car engines became more powerful by
1971-407: Is similar to the body-on-frame design. Instead of a relatively flat, ladder-like structure with two longitudinal, parallel frame rails, it consists of a central, strong tubular backbone (usually rectangular in cross-section) that carries the power-train and connects the front and rear suspension attachment structures. Although the backbone is frequently drawn upward into, and mostly above the floor of
2044-497: Is sometimes also referred to as a monocoque structure, because the car's outer skin and panels are made load-bearing, there are still ribs, bulkheads, and box sections to reinforce the body, making the description semi-monocoque more appropriate. The first attempt to develop such a design technique was on the 1922 Lancia Lambda to provide structural stiffness and a lower body height for its torpedo car body. The Lambda had an open layout with unstressed roof, which made it less of
2117-507: Is still used in modern-day sport utility vehicles such as the Jeep Grand Cherokee and Land Rover Defender . This design is also used in large vans such as Ford Transit , VW Crafter and Mercedes Sprinter . A subframe is a distinct structural frame component, to reinforce or complement a particular section of a vehicle's structure. Typically attached to a unibody or a monocoque, the rigid subframe can handle great forces from
2190-417: Is the main supporting structure of a motor vehicle to which all other components are attached, comparable to the skeleton of an organism. Until the 1930s, virtually every car had a structural frame separate from its body. This construction design is known as body-on-frame . By the 1960s, unibody construction in passenger cars had become common, and the trend to unibody for passenger cars continued over
2263-459: The B-pillar , C-pillar and other bodywork removed. However, the cabrio-coach retains all bodywork to the top of the door frames and just replaces the roof skin with a retractable fabric panel. An advantage of a cabrio coach is that retaining more of the car's original structure means that structural rigidity is higher (or the vehicle weight is lower) than traditional cabriolets. An example of
BYD S8 - Misplaced Pages Continue
2336-476: The Ford Thunderbird (1st-generation and 11th-generation), Mercedes SL (2nd-generation and 3rd-generation), Porsche Boxster , Jeep Wrangler , Ford Mustang Cobra (1995 Only), and Mazda MX-5 . During the 1950s and 1960s, detachable hard-material roofs were offered for various convertible sports cars and roadsters , including the 1955–1957 Ford Thunderbird and Chevrolet Corvette , as well as
2409-544: The Hornets and all-wheel-drive Eagles for a new type of frame called the "Uniframe [...] a robust stamped steel frame welded to a strong unit-body structure, giving the strength of a conventional heavy frame with the weight advantages of Unibody construction." This design was also used with the XJC concept developed by American Motors before its absorption by Chrysler, which later became the Jeep Grand Cherokee (ZJ) . The design
2482-667: The Jeep Wrangler Unlimited. Peugeot presented a concept four-door retractable hardtop convertible, the Peugeot 407 Macarena in 2006. Produced by French coachbuilding specialist Heuliez , the Macarena's top can be folded in 60 seconds, with a steel reinforcing beam behind the front seats incorporating LCD screens for the rear passengers into the crossmember. Off-road: Several off-road vehicles have been produced with removable soft tops. Examples include
2555-537: The Jeep Wrangler , Suzuki Vitara , Suzuki Jimny , Ford Bronco , Land Rover Defender , Mercedes-Benz G-Class as well as early models of the Toyota Land Cruiser and Land Rover Defender . Typically, the soft tops attach to the roll cage or to the installation points on the vehicle's body. Landaulet: A landaulet (also known as landaulette ) is where the rear passengers are covered by
2628-630: The Nissan Figaro (1991), the Jaguar XJ-S C (1983) as well as the 1957 Fiat 500 and its 2007 Fiat 500 successor. The 1984 Heuliez-designed Citroën Visa Décapotable used elements of a fixed-profile convertible. Four-door: Most convertibles have two doors. However, four-door convertibles have been mass-produced. Examples include the 1940-41 Cadillac Series 62 , 1931 Chrysler Imperial Dual Cowl Phaeton and 1961-67 Lincoln Continental . Current production four-door convertibles include
2701-478: The Packard Caribbean , Oldsmobile 98 , and Imperial by Chrysler. Automakers often included a convertible body style as an available body style in a model range. Convertibles in the U.S. market peaked in sales around 1965, and fell in popularity over the next five years. Optional air conditioning was gradually becoming more popular, and the availability of sunroofs and T-tops limited the appeal of
2774-591: The Targa top versions of the AMC Concord and Eagle "Sundancer" as well as the Toyota Celica "Sunchaser" as specialty models. American Sunroof Company (ASC), which was responsible for popularizing the sunroof option for regular body styles, converted a Buick Riviera into a full convertible that compelled General Motors to market it as part of the 1982 Buick models. Chrysler Corporation also introduced
2847-404: The rails or beams . These are ordinarily made of steel channel sections by folding, rolling, or pressing steel plate. There are three main designs for these. If the material is folded twice, an open-ended cross-section, either C-shaped or hat-shaped (U-shaped), results. "Boxed" frames contain closed chassis rails, either by welding them up or by using premanufactured metal tubing . By far
2920-399: The 1963–1971 Mercedes-Benz W113 series of two-seaters. Because the convertible top mechanism is itself expensive, the hard roof was customarily offered as an additional, extra-cost option. On early Thunderbirds (and Corvettes through 1967), buyers could choose between a detachable hardtop and a folding canvas top at no additional cost, but paid extra for both. The metal-framed " Carson top "
2993-525: The U.S. automakers discontinued the body style from their lineups. American Motors stopped making convertibles after the 1968 model year, Chrysler after 1971, Ford after 1973, and most divisions of General Motors after 1975. Cadillac held out until 1976, when they made about 14,000. The last 200 had a red, white, and blue motif and a dashboard plaque. The very last was offered to the Smithsonian Institution, whose trustees turned it down as it
BYD S8 - Misplaced Pages Continue
3066-680: The United States at that time. These roadsters included the MG Midget and Triumph Roadster . The convertible design was incorporated into the mass market unibody by Hudson in 1948. United States automakers manufactured a broad range of convertible models during the 1950s and 1960s – from economical compact-sized models such as the Rambler American and the Studebaker Lark , to the more expensive models, such as
3139-455: The addition of a chassis. The terms "unibody" and "unit-body" are short for "unitized body", "unitary construction", or alternatively (fully) integrated body and frame/chassis. It is defined as: A type of body/frame construction in which the body of the vehicle, its floor plan and chassis form a single structure. Such a design is generally lighter and more rigid than a vehicle having a separate body and frame. Vehicle structure has shifted from
3212-431: The axles and then back down on the other side for bumper placement. Kick-ups do the same thing without curving down on the other side and are more common on the front ends. Another feature are the tapered rails that narrow vertically or horizontally in front of a vehicle's cabin. This is done mainly on trucks to save weight and slightly increase room for the engine since the front of the vehicle does not bear as much load as
3285-479: The back. Design developments include frames that use multiple shapes in the same frame rail. For example, some pickup trucks have a boxed frame in front of the cab, shorter, narrower rails underneath the cab, and regular C-rails under the bed. On perimeter frames, the areas where the rails connect from front to center and center to rear are weak compared to regular frames, so that section is boxed in, creating what are called "torque boxes". Named for its resemblance to
3358-557: The best-selling convertible with over 1 million cars sold. Also in 1989, Toyota released the Toyota Soarer Aerocabin, which uses an electrically operated retractable hardtop roof. A total of 500 were produced. Models dedicated to the convertible body style include the Mazda MX-5 , Porsche Boxster , and Opel Cascada . A "soft top" is made from a flexible textile material: Other materials are also used in
3431-407: The cabrio coach is the 2003-10 C3 Pluriel , which has a roof with five possible configurations. Fixed-profile: In contrast to convertibles where the entire bodywork above the beltline (doors, roof, side pillars, side bodywork) is replaced with a folding or retractable roof, the fixed profile convertible retains portions of fixed bodywork including the doors, side pillars, and side elements of
3504-662: The components needs to be stamped with ridges and hollows to give it strength. Platform chassis were used on several successful European cars, most notably the Volkswagen Beetle , where it was called "body-on-pan" construction. Another German example are the Mercedes-Benz "Ponton" cars of the 1950s and 1960s, where it was called a "frame floor" in English-language advertisements. The French Renault 4 , of which over eight million were made, also used
3577-420: The convertible top. By 1955, the most popular materials were latex and butyl rubber fabrics that each accounted for around 35% of the convertible top's weight, with others included vinyl (12%), jute (8%), along with rayon and acrylic fibers (Orlon), amounting to about 1% each in the compositions. Polyvinyl chloride (PVC) material was used for many convertible tops. The material consists of two layers:
3650-445: The driver has a fixed roof and the passenger compartment has a folding roof. Less expensive cars, such as the runabouts , sporting roadsters , or sturdy touring cars , remained either completely open air or were fitted with a rudimentary folding top and detachable clear side curtains. In the 1920s, when steel bodies began to be mass-produced, closed cars became available to the average buyer, and fully open cars began to disappear from
3723-407: The end of the 19th century, folding textile or leather roofs (as had been used on victoria or landau carriages) began to appear on cars. Examples of early cars with roofs include the phaeton (a two-seat car with a temporary roof), the brougham or a coupé de ville , having an enclosed passenger compartment at the rear, while the driver sat in front either in the open, or the landaulet , where
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#17327931726143796-435: The engine and drive train. It can transfer them evenly to a wide area of relatively thin sheet metal of a unitized body shell. Subframes are often found at the front or rear end of cars and are used to attach the suspension to the vehicle. A subframe may also contain the engine and transmission . It normally has pressed or box steel construction but may be tubular and/or other material. Examples of passenger car use include
3869-437: The ensuing decades. Nearly all trucks , buses, and most pickups continue to use a separate frame as their chassis. The main functions of a frame in a motor vehicle are: Typically, the material used to construct vehicle chassis and frames include carbon steel for strength or aluminum alloys to achieve a more lightweight construction. In the case of a separate chassis, the frame is made up of structural elements called
3942-537: The forces in each strut are either tensile or compressive, never bending, so they can be kept as thin as possible. The first true spaceframe chassis were produced in the 1930s by Buckminster Fuller and William Bushnell Stout (the Dymaxion and the Stout Scarab ) who understood the theory of the true spaceframe from either architecture or aircraft design. The 1951 Jaguar C-Type racing sports car utilized
4015-560: The late 2000s truck-based compact SUVs were phased out and replaced with crossovers). An additional advantage of a strong-bodied car lies in the improved crash protection for its passengers. American Motors (with its partner Renault ) during the late 1970s incorporated unibody construction when designing the Jeep Cherokee (XJ) platform using the manufacturing principles (unisides, floorplan with integrated frame rails and crumple zones, and roof panel) used in its passenger cars, such as
4088-548: The main body. It was so successful that the Soviet post-war mass produced GAZ-M20 Pobeda of 1946 copied unibody structure from the Opel Kapitän. Later Soviet limousine GAZ-12 ZIM of 1950 introduced unibody design to automobiles with a wheelbase as long as 3.2 m (126 in). The streamlined 1936 Lincoln-Zephyr with conventional front-engine, rear-wheel-drive layout utilized a unibody structure. By 1941, unit construction
4161-495: The mainstream market. By the mid 1930s, the remaining small number of convertibles sold were high-priced luxury models. In 1939, Plymouth introduced the first mechanically operated convertible roof powered by two vacuum cylinders. Demand for convertibles increased as a result of American soldiers in France and the United Kingdom during World War II familiarizing themselves with small roadster cars, which were not available in
4234-492: The most common, the C-channel rail has been used on nearly every type of vehicle at one time or another. It is made by taking a flat piece of steel (usually ranging in thickness from 1/8" to 3/16", but up to 1/2" or more in some heavy-duty trucks ) and rolling both sides over to form a C-shaped beam running the length of the vehicle. C-channel is typically more flexible than (fully) boxed of the same gauge. Hat frames resemble
4307-437: The open body style. Noise, leaks, and repairs associated with fabric tops also contributed to issues that many customers had. The popularity of convertibles was reduced by the increased travel speeds on roads (resulting in more wind and noise for occupants) and the emergence of more comprehensive vehicle crash safety standards in the United States. The market share of convertibles fell to two or three percent of total sales and
4380-587: The overall height of the vehicles regardless of the increase in the size of the transmission and propeller shaft humps since each row had to cover frame rails as well. Several models had the differential located not by the customary bar between axle and frame, but by a ball joint atop the differential connected to a socket in a wishbone hinged onto a crossmember of the frame. The X-frame was claimed to improve on previous designs, but it lacked side rails and thus did not provide adequate side impact and collision protection. Perimeter frames replaced this design. Similar to
4453-442: The prevalent design for body-on-frame cars in the United States, but not in the rest of the world, until the unibody gained popularity. For example, Hudson introduced this construction on their 3rd generation Commodore models in 1948. This frame type allowed for annual model changes , and lower cars, introduced in the 1950s to increase sales – without costly structural changes. The Ford Panther platform , discontinued in 2011,
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#17327931726144526-411: The roof vary across eras and manufacturers. A convertible car's design allows an open-air driving experience, with the ability to provide a roof when required. A potential drawback of convertibles is their reduced structural rigidity (requiring significant engineering and modification to counteract the side effects of almost completely removing a car's roof). The majority of convertible roofs are of
4599-446: The roof — while a center fabric portion slides back and accordions at the rear. As an example, Citroën 's 1948 Citroën 2CV featured rigid bodysides and two doors on each side, along with a sunroof that rolled back on itself and extended to the rear bumper in place of a separate trunk lid. Other fixed-profile convertibles include the 1957 Autobianchi Bianchina Trasformabile , 1957 Vespa 400 , 1950 Nash Rambler Landau Convertible Coupe,
4672-648: The traditional body-on-frame architecture to the lighter unitized/integrated body structure that is now used for most cars. Integral frame and body construction requires more than simply welding an unstressed body to a conventional frame. In a fully integrated body structure, the entire car is a load-carrying unit that handles all the loads experienced by the vehicle – forces from driving and cargo loads. Integral-type bodies for wheeled vehicles are typically manufactured by welding preformed metal panels and other components together, by forming or casting whole sections as one piece, or by combining these techniques. Although this
4745-453: The transition areas from front to center and center to rear reduce beam and torsional resistance and is used in combination with torque boxes and soft suspension settings. This is a modification of the perimeter frame, or of the backbone frame, in which the passenger compartment floor, and sometimes the luggage compartment floor, have been integrated into the frame as loadbearing parts for strength and rigidity. The sheet metal used to assemble
4818-798: The vehicle when not in use, requiring a garage or other storage facility. Some open cars continue to offer it as an option. For example, the Mazda MX-5 has an accessory hardtop, which is compulsory for some auto racing series. A retractable hardtop — also known as "coupé convertible" or "coupé cabriolet" — is a car with an automatically operated, self-storing hardtop (as opposed to the textile-based roof used by traditional convertibles). The benefits of improved climate control and security are traded off against increased mechanical complexity, cost, weight, and often reduced luggage capacity. Folding textile convertible tops often fail to completely hide their internal mechanism or can expose their vulnerable underside to sun exposure and fading. A tonneau cover provides
4891-433: The vehicle, the body is still placed on or over (sometimes straddling) this structure from above. This is the design used for the full-size American models of General Motors in the late 1950s and early 1960s in which the rails from alongside the engine seemed to cross in the passenger compartment, each continuing to the opposite end of the crossmember at the extreme rear of the vehicle. It was specifically chosen to decrease
4964-417: Was a popular addition for the 1930s Ford convertibles or roadsters because it turned these models into an almost instant hardtop. The design mimicked a convertible top, but lacking the bulky folding mechanisms enabled the removable hardtop to have a much lower and more rakish profile. Improvements in canvas tops have rendered the detachable hard roof less common in part because the top cannot be stored inside
5037-449: Was no longer a new idea for cars, "but it was unheard of in the [American] low-price field [and] Nash wanted a bigger share of that market." The single unit-body construction of the Nash 600 provided weight savings and Nash's Chairman and CEO, George W. Mason was convinced "that unibody was the wave of the future." Since then, more cars were redesigned to the unibody structure, which
5110-554: Was not at that moment a historic artifact, "Though it might well be in three generations ... or at the Tricentennial." After the last Cadillac Eldorado convertible was made in 1976, the only factory convertibles sold in the United States were imported. Making convertibles on the assembly line was both expensive and time-consuming, thus not worth the problems needed to sell the limited number of cars. Specialized coachbuilders were contracted to make dealer-available cars such as
5183-515: Was not ideal because the panel fits were poor. To convince a skeptical public of the strength of unibody, both Citroën and Chrysler created advertising films showing cars surviving after being pushed off a cliff. Opel was the second European and the first German car manufacturer to produce a car with a unibody structure – production of the compact Olympia started in 1935. A larger Kapitän went into production in 1938, although its front longitudinal beams were stamped separately and then attached to
5256-432: Was one of the last perimeter frame passenger car platforms in the United States. The fourth to seventh generation Chevrolet Corvette used a perimeter frame integrated with an internal skeleton that serves as a clamshell. In addition to a lowered roof, the perimeter frame allows lower seating positions when that is desirable, and offers better safety in the event of a side impact. However, the design lacks stiffness because
5329-508: Was trademarked by Carrozzeria Touring for lightweight sports-car body construction that only resembles a space-frame chassis. Using a three-dimensional frame that consists of a cage of narrow tubes that, besides being under the body, run up the fenders and over the radiator, cowl, and roof, and under the rear window, it resembles a geodesic structure . A skin is attached to the outside of the frame, often made of aluminum. This body construction is, however, not stress-bearing and still requires
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