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Around the World in 80 Years: Opel Kadett Celebrates its Birthday

• Kadett launched as innovative small car with an integral body and frame
• Over 24 million Kadett and Astra have been sold to date
• Current generation Astra continuing the success story of its ancestors

The first Opel Kadett was a minor sensation, both technically and in terms of price. More than 100,000 of these four-seat models were built from 1936 to 1940 in Rüsselsheim, which even then was one of the most advanced car-making plants in Europe. The first Kadett with its revolutionary unitary body construction available as a sedan or convertible cost only 2,100 marks.

With its good value for money and progressive features, the first Kadett laid the corner stone for Opel’s success in the compact class. To date, eleven generations of Kadett and Astra have been successful in their segment: Over 24 million Opel Kadett and Opel Astra cars sold is an impressive number and a notable achievement. Lined up one behind the other, all Opel compact models built so far would surpass the magical 100,000-kilometer mark and create a column of cars that could circle the equator two and a half times. Opel compact cars have successively made personal mobility accessible to a broad customer base, especially in economically difficult times and not only that. The latest generations have made technologies and innovations from higher segments affordable for numerous customers. The new Opel Astra, launched in 2015, has already been ordered 275,000 times across Europe.

1936-1940: Opel Kadett 1 – The Volkswagen

The speedy four-seater could do nearly 100 km/h and it did not take long to find its way into the hearts of the general public. It also found favor with the press: “As the first test drives have confirmed, the Kadett is certainly not an ordinary vehicle in this price range,” wrote a German newspaper, “Braunschweiger Tageszeitung,” on December 5, 1936. The chassis with Dubonnet independent front suspension and leaf-spring rear axle stemmed from the Opel Olympia, and the L-head four-cylinder gray cast-iron engine was taken from the Opel P 4. It generated 23 hp from a displacement of 1,073 cm3. The advantages of taking the engineering from a modular system also played a key part in the low price of the car. Just like its big brother the Olympia, which it resembles in appearance, the Kadett is a modern car. Harmonious proportions with a hatchback and integrated headlights are characteristic.

Like its big brother the Olympia, which it also resembles, the Kadett was a snazzy car. It was characterized by harmonious proportions with fastback and integrated headlamps. In 1938 a major mid-cycle enhancement added a new radiator mask in late art deco style– experts today count this model as an intermediate generation.

From Kadett to Admiral

“Just as agile, versatile and obedient to all the driver’s commands as you would expect of a career-making cadet,” wrote the Cologne newspaper, “Kölnische Zeitung,” in 1936 about Opel’s new car. Its name, “Kadett” was as new as the segment. Up until the debut of the first Astra in 1991 (see page 54), Opel’s compact class line would use this name for more than  five decades. The company launched two more ranges with names stemming from the German navy, Admiral and Kapitän, in 1937 and 1938.

Unitary body and ultra-modern production

After the Olympia, which was the first German series-production vehicle to feature a unitary all-steel body, the first Kadett also had a monocoque body. There are many advantages of this construction compared with the classic wooden body-on frame. For instance, the driving performance and fuel consumption benefit from the car’s low weight, while the safety level is higher thanks to the rigid passenger cell and the lower center of gravity. The self-supporting structure opened the door to a new production method that is still commonly used today: The body and the powertrain (engine, transmission, axles) are “married” on the production line with the help of hydraulic elevators. The Kadett was manufactured by Opel, in Rüsselsheim. In 1936, the company operated the most modern drop forge in the world and the largest body press shop in Europe.

Fresh design and innovative technology

Headlamps integrated into the body instead of the ancient separate lamp units gave the Kadett a fresh appearance. Not surprising, because it was Opel that first made modern car design popular in Europe. Back in the 1930s, shortly after the company’s integration into the General Motors Group, a design department was established in Rüsselsheim on the initiative of GM chief designer, Harley Earl.

Plenty of car for your money: As long ago as 1936, the first Kadett offered the same good value for money and thus democratized luxury. This has become typical of the Opel brand. Details such as hydraulic four-wheel brakes, direction indicator, draft-free ventilation through a triangular hinged window and “dustproof” trunk accessible from the inside were at that time very unusual for this category of car – in the Kadett, they were all standard.

The Kadett was the first Opel model to feature an in-house developed downdraft carburetor with a so-called venturi tube. In this tube, named after the Italian physicist, Giovanni Battista Venturi (1746–1822), the fuel is mixed into the incoming air ahead of the throttle valve. The venturi tube is a smooth-walled piece of tubing with a constriction in it. When air flows through the tube and passes the constricted section, it has to flow faster at this point than in the other sections. As a result, a vacuum is produced (as on the upper side of an aircraft wing). At the constricted point is a tube filled with gasoline. The fuel is sucked in by the vacuum in the venturi tube and dragged along.