Thursday, March 20, 2008

Opel GT: In Depth

Dynamic Look Is New Interpretation of Roadster

  • Classic proportions wide stance with sleek silhouette and short overhangs
  • Unmistakable personality with impressive front and strong features
  • Archetypal roadster shape with tailor-made fabric roof

With its exciting, sharply sculpted design, the new Opel GT embodies the quintessential roadster in modern, contemporary form. Clear-cut edges contrast with muscular arched surfaces, creating an extraordinarily dynamic look that gives the GT its own unmistakable personality. And the characteristic proportions ? wide stance with sleek silhouette, long hood and short overhangs ? make it the ultimate example of its class. 18-inch aluminum wheels in new five-spoke design emphasize the roadster character, as does the tailor-made fabric roof, which completely disappears beneath a cover for open-top driving fun, and seamlessly integrates into the car’s shape when closed.

The new roadster’s face displays archetypal characteristics of its genre, as well as Opel-typical design elements in bold form:

  • Wide, long front-hinged hood; sleek, short overhangs
  • Striking front with large air intake in honeycomb design
  • Wide chrome grille crossbar with integrated Opel logo
  • Hood with distinctive center crease and air vents
  • Bold 3-D headlamps in clear glass look drawn deep into the side panels
  • V-shaped front end with prominent lamp units
  • Powerfully sculpted fender with grooving and roadster-typical contours
  • Tailor-made fabric roof

The GT’s especially sporty characteristics include the long chrome-bordered air vents in the hood, the grooving in the front fenders with their dynamic, Opel-typical horizontal signature lines ? like on the Antara ?, the double-pipe exhaust system and the twin air scoops behind the head restraints. These are not just reminiscent of classic motor sport and roadster design, but also fulfill an aerodynamic function by reducing air turbulence.

Both in silver, the windshield frame and the trim around the roof stowage compartment further accentuate the car’s distinctive look. The GT is available in seven colors, including colorful shades such as sunshine yellow and Eifel blue.

The ergonomically perfect cockpit with high-grip sport steering wheel, chrome-ringed dials and contoured sport seats is tailor-made for sporty driving. The short gear stick considerably adds to driving fun with its crisp, uncluttered operation; short gear travel enables quick gear shifts from the roadster-typical casual seating position. Customers who choose the Premium package, which includes leather seats with visible stitching and leather trim in the doors, have the choice between classic black leather upholstery or a bold two-tone combination of cobalt red and black. The high-tech look of the surface structures, accented with black piano lacquer and chrome finishes, underline the sporty ambience, while the chrome-ringed ventilation and lighting controls are further evidence of the GT designers’ careful attention to detail.

The roadster’s design was inspired by the Solstice concept car from 2002 and the Vauxhall VX Lightning concept car (2003) from the GM Advanced Design Studio in Coventry, England. The development of the new Opel GT is a prime example of transcontinental collaboration within GM. It stems from the decision to expand the portfolio with a compact, rear-wheel drive, sporty vehicle. The final Opel GT design was completed jointly at the GM Europe Design Studios in Rüsselsheim and the GM Design Studio in Detroit under the direction of Bryan Nesbitt.

Sporty Silhouette with Short Overhangs”

Three Questions for Bryan Nesbitt, Executive Director, GM Europe Design

The first Opel GT was a milestone in the history of automobile design. Doesn’t that make it very difficult for a designer to create a successor?

Certainly the market landscape has changed from the original GT’s introduction. Image vehicles have become increasingly dramatic. Our intent is to capture some of the emotional imprints of the original GT. You should recognize similarities like the leaping front fenders and long hood proportions, but interpreted in a modern perspective relevant to todays Opel portfolio. Importantly, not unlike the original, the new GT visually communicates that this is a vehicle made for enjoying the drive.

Now, there can be advantages to creating a niche model such as a roadster: You typically have more freedoms due to the more singular image intent of the product versus a volume model.

What are the Opel GT’s classic sporty roadster characteristics?

Proportions play the major role in establishing a car’s foundational appeal. The GT is broad and flat. Its elongated silhouette, long dash-to-axle with short overhangs and 18-inch wheels pushed far into the corners, are the proportional ingredients.

Where was the Opel GT design created?

In Europe. The Opel GT design takes its inspiration from the Vauxhall VX Lightning concept car, which was developed in May 2003 at the GM Advanced Design Studio in England to celebrate the brand’s hundredth anniversary. The GT’s final execution took shape at the GMs Design Center in Detroit and the GM Europe Design Center in Rüsselsheim. With an international approach to design, we are using the best ideas from a diverse, talented workforce to create fresh, contemporary vehicles that resonate with our customers and stimulate their passion for driving a roadster and for the brand Opel.

Bryan Nesbitt was named Executive Director, GM Europe Design in February 2004. In this capacity, he is responsible for all Opel/Vauxhall, Saab and certain Saturn design activities. He was born in Phoenix, Arizona, U.S.A. on January 24, 1969. Bryan Nesbitt studied Architecture and Industrial Design at the Georgia Institute of Technology and holds a Bachelor of Science degree in Automobile Design from the Art Center College of Design in Pasadena, California, U.S.A.


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Source: Source: Adam Opel AG






Related entries:

Steinmetz GT debut in Essen


Opel GT: In Depth

Innovative Production Processes

  • Rigid vehicle structure with hydroformed side members à la Corvette
  • Production according to “GM Global Manufacturing System”

The Opel GT’s roadster architecture, which it shares with its successful American sister models Pontiac Solstice and Saturn Sky, was designed from the beginning to meet the special demands of a sporty two-seater of this classic genre. The chassis is assembled using a number of different fabrication processes and assembly methods: Hydroformed steel frame tubes - with their high strength-to-weight ratio - and conventional stampings are joined using spot welding, MIG welding and adhesive bonding to produce the extremely rigid chassis structure needed in a convertible sports car.

The Opel GT is built at the Wilmington/Delaware plant in the USA according to the quality focused “GM Global Manufacturing System” (GM GMS). Implemented worldwide, the system is based on five key concepts: Built-in-Quality, Standardization, Continuous Improvement, Short Lead Time and People Involvement including shared responsibility for quality management.

The hydroformed tube structure, which runs from the front bumper, through the left and right-hand frame tubes all the way to the rear bumper, provides the vehicle with an extremely strong foundation. The only other car that uses this kind of complete hydroformed frame is the Chevrolet Corvette – for the same reason: The high strength-to-weight ratio of a hydroformed frame greatly benefits a powerful sports car.

Sheet hydroforming uses water pressure to help create the vehicle’s skin. The process is slower and more precise than traditional body stamping and offers the advantage of providing a much deeper “draw,” which enables the designers to use a greater creative freedom. Hydroforming alone made possible the Opel GT’s large, curvaceous clamshell hood, doors and rear quarter panel. Conventional stamping processes could not yield the same results.

Composite construction similar to Corvette

In the body shop, the underbody - including a large, enclosed central tunnel - is welded to the frame tubes. Floor panels are spot-welded above the corrugated sections to provide a flat passenger footwell area for both seats in a composite construction process similar to the one used on the Corvette. Unique assembly methods are employed during production to achieve the highest possible rigidity, such as adhesive bonding and MIG welding technology. Metal Inert Gas (MIG) welding technology is a special electric arc welding process whereby the welding point is sprayed with a protective gas. MIG welding is employed on the Opel GT for the brackets and other chassis and body structures. Accessibility was the key here and was partly necessitated by the use of the hydroformed frame tubes, whose box sections do not allow for access to the inside of the tube.

The front dash structure and windshield frame - created from molded steel components that are spot welded together as a complete unit - are built up separately from the rest of the chassis. Although they have no supporting function, they do increase torsional rigidity. After painting, the unit is fitted with the instrument panel, steering controls, pedals and other related components. This dash/windshield sub-assembly is mated to the chassis during the vehicle’s general assembly process when it is lowered over the chassis hinge pillars and bonded in place using industrial adhesive - a process which is also used in modern aircraft construction - applied at the lower edge. Locating bolts on the hinge pillars hold the assembly in place during the curing process. Using similar modular designs, the upper rear partition well and luggage compartment well are pre-assembled from fiberglass-reinforced composite material.

In the event of damage to a car, technical adhesive bonding can be used for a range of low-cost repair procedures. The new Opel GT is a repair-friendly representative of its class, and is favorably classified by insurers despite its high level of driving performance. The body’s modular design, clever arrangement of components (a radiator situated far behind the large impact limiter, for example), the possibility of sectional repairs and the repairable hydroformed steel frame all contribute to the car’s favorable insurance rating.

Complex processes for exact finishes

All exterior body components are painted separately from the chassis structure prior to assembly. The parts are lacquered in groups on a “painting buck” to ensure color match. This off-line painting process makes possible the special accent-color body parts, such as the silver-colored windshield frame and tulip panel behind the driver and passenger seat headrests Wilmington assembly's body shop consists primarily of manual operations. Many of the around 1800 employees are well-trained, experienced specialists in precise manual body construction. Apart from a few robot stations, the roadster is completely produced by complex manual workmanship.


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Source: Source: Adam Opel AG





Related entries:

Steinmetz GT debut in Essen