it was in the year 1999 and at the auto show in Frankfurt, the Opel was the debut of the concept car G90. A car of its kind revolutionary just a month after its debut, it was named “Concept Car of the Year” by the authoritative magazine specialized Automotive News International”.
A car is characterized by very low consumption, equipped with a motor three-cylinder petrol 60 Hp sequential injection with emissions equal to 90 grams of CO2 per kilometer (from which is derived the name G = 90), capable of anticipating nine years, the legislation introduced in 2008 in the European Union.
The compact four-seater was able to achieve this result thanks to the containment of the weight and the coefficient of aerodynamic penetration (Cx 0,22), and was also the future of the stylistic of the Opel highlighting the new criteria for the construction of the interior.
"on The eve of the new millennium, Opel G90 is presented as a new approach to the mobility of the future, with an aerodynamic shape and a total mass of 750 kg, explained Hans-Demand, at the time responsible for the development of the German house – This new concept car demonstrates that – regardless of the mechanics and without resorting to exotic materials or restrict the comfort of the occupants – it is possible to build a car from the affordable price that has a power consumption of about 3 liters per 100 kilometers and is also enjoyable to drive".
The concept car G90 could reach the speed of 180 km/h thanks to its coefficient of aerodynamic penetration and index of the front section (CxA) of 0.45, results obtained by designers through the adoption of an original teardrop shape with the roof which is very tilted and truncated tail.
The research of the optimization of the aerodynamics was also highlighted in many points of the bodywork as the wheels are partially hidden, the sides smooth, or the two “humps” on the roof.
care for The aerodynamics, however, had not undermined the habitability, so much so that the trunk of the compact prototype, also considering the space hidden under the floor, reached a capacity of 350 litres, which became 980 liters knocking down the backrests of the rear seats.
The front passenger seat could also be folded (the solution then adopted on the mpv compact Meriva) providing a single flat surface of load 2.50 meters of length.
"Similarly to the shape of the tail, and the underbody smooth, with box, inside of which was also added to the exhaust system, contributed significantly to the aerodynamics of the G90 – point at the headquarters – The aluminium platform was designed specifically for this prototype.
it Was often a single mm and also very light. His stiffness was due to a special honeycomb structure to hexagonal cells. To obtain a flat surface, the cross beams that usually are seen inside of the vehicle were included in the structure of the floor.
The limit of just 750 kg had been reached with strategic implementation of lightweight materials like aluminium and magnesium".
low Weight and aerodynamics of record allowed the Opel G90 has an autonomy of about 770 kilometers with a full tank of 30 litres of petrol.
The weight reduction had been achieved through a meticulous lightening of various components such as the steering knuckles, the struts of the suspension, the exhaust system and the engine hood with wide use of aluminum.
weight reduction is still more significant was obtained with the components made of magnesium like the casing of the transmission, of the steering wheel, some parts of the seats and the roof (the rest of the bodywork was aluminium).
Furthermore, thanks to the “weight loss cure” the general and the lightening that had been subjected to the higher parts of the bodywork it had been possible to lower the center of gravity of the car to the advantage of a better road holding.
"The G90 contains the famous characteristics of the Opel production as the excellent aerodynamics, the validity of aesthetics and the great economy – said at the time, Robert W. Hendry, president and managing director of Adam Opel AG – Is therefore the essence of the building tradition and expertise of a century in the automotive field.
This prototype also expressed the responsibility that we feel as manufacturers of passenger cars with regard to environmental issues and future generations." (m.r.)
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