60-750: The Vauxhall Wyvern is a medium-sized family car introduced by Vauxhall in 1948 as a successor to the Vauxhall 12. The name comes from the mythical beast the wyvern , and may be due to a misidentification of the heraldic griffin on the Vauxhall badge. The L-series Vauxhall Wyvern, along with the Velox , were Vauxhall's first new post-war models. Incorporating American influence, the Wyvern started production in September 1948 and finished in July 1951. Many of them were exported to help
120-578: 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
180-456: A 94-inch wheelbase and used a 10 hp engine. The saloon featured a six light body with a side window behind each rear door unlike the British H Series 10-4 model. The wheelbase was increased in 1940 to 97¾ inches. Production ceased in 1941 but was resumed in 1946, using pre-war tooling. A new grille with horizontal bars was adopted, replacing the previous vertical bar design. The 10 h.p engine
240-405: 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 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,
300-461: 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 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
360-530: 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
420-470: 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
480-420: 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
540-547: 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')
600-420: A longer passenger cabin, a more rounded boot and an additional side window behind the rear doors. Australian vehicles carried the model code LBX. The E Series Wyvern was produced from 1952 to 1957. In addition to building the 4-door integral body-chassis Wyvern sedan, GMH continued to build a separate chassis and developed a 2-door convertible and a Coupe Utility for it. The convertible was initially marketed as
660-467: 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
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#1732868827427720-497: A separate chassis frame. As well as countering prejudice against using "chassisless" vehicles on outback roads, the separate box girder chassis provided either an open tourer body or a utility body. The new post-war Holden car was "chassisless", so the Vauxhall gave GMH customers the option of a ute or a convertible with a chassis. GMH introduced a locally built Vauxhall Wyvern model to the Australian market in 1938, ten years prior to
780-453: 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
840-564: 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
900-529: 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
960-624: Is a UK term and a part of the D-segment in the European car classification. Mid-size cars are manufactured in a variety of body styles, including sedans , coupes , station wagons , hatchbacks , and convertibles . Compact executive cars can also fall under the mid-size category. The automobile that defined this size in the United States was the Rambler Six that was introduced in 1956, although it
1020-404: 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
1080-408: 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
1140-407: 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
1200-497: 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
1260-498: 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
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#17328688274271320-536: 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
1380-568: The "big cars of the future." By 1978, General Motors made its intermediate models smaller. New "official" size designations in the U.S. were introduced by the EPA , which defined market segments by passenger and cargo space. Formerly mid-sized cars that were built on the same platform, like the AMC Matador sedan, had a combined passenger and cargo volume of 130 cubic feet (3.68 m ), and were now considered "full-size" automobiles. Cars that defined
1440-413: 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 the ensuing decades. Nearly all trucks , buses, and most pickups continue to use a separate frame as their chassis. The main functions of
1500-410: 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 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
1560-430: The 1962 Ford Fairlane was viewed by consumers as too close to the compact Falcon in size and performance as well as too close to the full-sized Ford models in price. It was the introduction of General Motors " senior compacts " that grew the mid-size market segment as the line of cars themselves kept increasing in size. By 1965, these GM "A platform" mid-size models matched the size of 1955 full-size cars. During
1620-416: The 1970s, the intermediate class in the U.S. was generally defined as vehicles with wheelbases between 112 inches (2,845 mm) and 118 inches (2,997 mm). Once again, the cars grew and by 1974 they were "about as large as the full-size cars of a decade or so ago ... best sellers include Ford Torino , Chevrolet Chevelle , AMC Matador , Plymouth Satellite ..." The domestic manufacturers began changing
1680-435: The British economy. The car was fitted with a 1,442 cc (88.0 cu in) four-cylinder engine, generating 35 bhp (26 kW), with a top speed of 62 mph (100 km/h). The optional extras available were a radio, heater and foglight. The model is a forgotten classic, with very few surviving. Due to its American styling, the Wyvern resembled a "miniaturized" Chevrolet Fleetline . Australian vehicles carried
1740-704: The Caleche and later as the Vagabond. 1954 was the last year for the Coupe Utility, and the Vagabond was not included in the facelifted E Series range released in April 1955. Citations Bibliography Mid-size car Mid-size —also known as intermediate —is a vehicle size class which originated in the United States and is used for cars larger than compact cars and smaller than full-size cars . "Large family car"
1800-545: The UK market until Vauxhall abandoned the six seater four cylinder market and replaced it with the smaller but more radically styled Vauxhall Victor F-Series in 1957. A car with the 45 bhp (34 kW) engine tested by the British magazine The Motor in 1952 had a top speed of 71.6 mph (115.2 km/h) and could accelerate from 0–60 mph (97 km/h) in 37.2 seconds. A fuel consumption of 30.4 miles per imperial gallon (9.3 L/100 km; 25.3 mpg ‑US )
1860-455: 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
Vauxhall Wyvern - Misplaced Pages Continue
1920-431: 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
1980-479: 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
2040-422: The car's increased size. As before, a more powerful Vauxhall Velox was available with the new body. 5313 were made. After only six months production of the rebodied Wyvern the car received, in April 1952, Vauxhall's new short stroke 1508 cc four-cylinder engine. Along with its six -cylinder Velox version, the new engine had a bore of 79.3mm and a stroke of 76.2mm, identical measurements (and therefore capacity) as
2100-399: The combined passenger and cargo volume, mid-size cars are defined as having an interior volume index of 110–119 cu ft (3.1–3.4 m ). Vehicle frame#Unibody A vehicle frame , also historically known as its chassis , is the main supporting structure of a motor vehicle to which all other components are attached, comparable to the skeleton of an organism. Until
2160-639: 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
2220-665: The definition of "medium" as they developed new models for an evolving market place. A turning point occurred in the late 1970s, when rising fuel costs and government fuel economy regulations caused all car classes to shrink, and in many cases to blur. Automakers moved previously "full-size" nameplates to smaller platforms such as the Ford LTD II and the Plymouth Fury . A comparison test by Popular Science of four intermediate sedans (the 1976 AMC Matador, Chevrolet Malibu , Ford Torino, and Dodge Coronet ) predicted that these will be
2280-435: 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
2340-526: 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
2400-400: 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 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
2460-553: 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
Vauxhall Wyvern - Misplaced Pages Continue
2520-538: 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
2580-573: 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 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
2640-799: The mid-size market in the 1980s and 1990s included the Chrysler K-Cars ( Dodge Aries and Plymouth Reliant ), the Ford Taurus , and the Toyota Camry , which was upsized into the midsize class in 1991. The Taurus and Camry came to define the mid-size market for decades. Mid-size cars were the most popular category of cars sold in the United States, with 27.4 percent during the first half of 2012, ahead of crossovers at 19 percent. The United States Environmental Protection Agency (EPA) Fuel Economy Regulations for 1977 and Later Model Year (dated July 1996) includes definitions for classes of automobiles. Based on
2700-485: The model code LBX. In August 1951 a completely new Wyvern was launched, featuring a modern Ponton , three-box shape in a unitary construction body. In spite of the abandonment of the old RAC horsepower tax system which favoured long stroke engines, the old long stroke four cylinder 35 bhp (26 kW) engine from the L-series was retained and permitted a claimed top speed above 62 mph (100 km/h) despite
2760-587: 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
2820-442: 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,
2880-441: The rival Ford Consul/Zephyr engines introduced two years previously. With a power output of 45 bhp (34 kW) at 4,000 rpm, maximum speed rose to 72 mph (116 km/h). More performance was available from the six-cylinder Vauxhall Velox and (from 1954) Cresta versions. The EIX series Wyvern received a new bonnet and grille in 1955, a wrap-round rear window in 1956 and another new grille in 1957. The Wyvern sold well on
2940-648: 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
3000-453: 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
3060-483: The use of the Wyvern name in England. It was built on a separate chassis with a box-section cruciform frame. The six-light body with protruding luggage boot built to Holden's "turret-top" design used many of the front pressings of the unitary construction British Vauxhall H Series . It was produced in saloon and open Calèche body styles. The Calèche was offered in 2-seater roadster and 4-seater tourer models. The Wyvern had
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#17328688274273120-433: 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
3180-533: 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
3240-513: Was called a "compact" car at that time. Much smaller than any standard contemporary full-size cars, it was called a compact to distinguish it from the small imported cars that were being introduced into the marketplace. By the early 1960s, the car was renamed the Rambler Classic and while it retained its basic dimensions, it was now competing with an array of new "intermediate" models from General Motors, Ford, and Chrysler. The introduction of
3300-445: 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
3360-515: 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
3420-432: 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
3480-513: Was recorded. The test car cost £771 including taxes. 105,275 were made. The EBX model code was applied to the Australian "chassis only" variant of the Wyvern EIX. General Motors-Holden produced Vauxhall Wyvern models in Australia from 1938 to 1957. Although the external appearance was very like that of the British cars, which featured unitary construction , some of Australian Vauxhalls retained
3540-508: 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
3600-449: Was used, but this was soon replaced by a 12 h.p. unit. For an image of a 1938 sedan see external links below The L Series Wyvern was produced from 1948 to 1951. It was offered with an Australian developed sedan body, an Australian "Caleche" tourer body, both with a box girder chassis, or with the unitary construction English saloon body. Besides having a separate chassis the Australian sedan differed from its English counterpart in having
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