Category | Grand Prix |
---|---|
Constructor | Mercedes-Benz |
Designer(s) | Hans Nibel Max Sailer Albert Heess Max Wagner |
Successor | Mercedes-Benz W125 |
Technical specifications | |
Chassis | U-Section Pressed Steel Frame |
Suspension (front) | Double Wishbones w/Coil Springs & Friction Dampers |
Suspension (rear) | Swing Axle w/Transverse Quarter Elliptic Springs, Friction Dampers |
Engine | M25 3,360 cc (205.0 cu in) later 4,300 cc (262.4 cu in) I8 supercharged front-engine, longitudinally mounted |
Transmission | Mercedes-Benz 5-speed |
Power | 280–494 horsepower (209–368 kW) |
Competition history | |
Notable entrants | Daimler-Benz AG |
Notable drivers | Rudolf Caracciola Luigi Fagioli Manfred von Brauchitsch |
Debut | 1934 Avusrennen |
Drivers' Championships | 1 (1935, Rudolf Caracciola) [1] |
The Mercedes-Benz W25 was a Grand Prix racing car designed by Daimler-Benz AG for the 1934 Grand Prix season, in which new rules were introduced, and no championship was held. In 1935, [2] the European Championship was resumed, and it was won by Rudolf Caracciola in a W25. In modified form, the W25 remained in use until 1937, when it was succeeded by the Mercedes-Benz W125.
For the 1934 season, Grand Prix racing's governing body AIACR introduced a formula limited mainly by a maximum weight of 750 kg, [3] which was considerably less than the weight of Daimler's previous car used in racing, the outdated seven litre Mercedes-Benz SSK. That range of cars had been developed in the 1920s by Ferdinand Porsche, who was by now independent, and proposed his P-Wagen project racing car concept to the chancellor in office since January 1933: Adolf Hitler. He decided to support both the new company Auto Union, who took over Porsche's concept, and Mercedes-Benz, who had more than a quarter century of experience in major international racing.
Despite reducing weight and engine size to roughly half, Daimler engineers soon managed to get more power from the supercharged Straight-8 M25 engine than the maximum 300 hp of the SSK. While the W25 was developed in 1933, the first appearance was scheduled to be at the 1934 Avusrennen in Berlin, held on May 27. Mercedes showed up, but after encountering carburetor [4] or fuel pump [5] problems in practice, withdrew from the race. The next entry a week later, again on home soil, at the Nürburgring Eifelrennen, was successful, with Manfred von Brauchitsch [6] winning. It is often claimed that this race was the beginning of the Silver Arrows, but it since has been proven that already in 1932 at the AVUS, v. Brauchitsch had raced an SSKL covered with streamline aluminium sheets, which had been described as a silver arrow by the media. Besides, both German rounds were run to Formula libre rules to attract more entries.
In 1934, the W25 won four major races (Eifelrennen, Coppa Acerbo, Spanish and Italian GP) compared to three for Auto Union (German, Swiss and Czechoslovakian GP), plus the Klausenpass hillclimbing event. These popular uphill races were usually dominated by the superior traction of the mid engine Auto Union of Hans Stuck, who won [7] at Felsberg , Kesselberg, Freiburg Schauinsland and Mont Ventoux. [8] The German cars also took two wins in Italy, where the major competitors came from. On the other hand, two events on the soil of World War I adversaries ended rather embarrassingly. The 1934 French Grand Prix [9] held near Paris had been a disaster for both German teams, as none of their cars finished. The 1934 Belgian Grand Prix was held on the Circuit de Spa-Francorchamps which then had a tight corner named after the nearby Ancienne Douane, the old customs station at the former border with Germany. The border had been moved after the war, but the Belgians set up an even tighter chicane for the Germans: Custom officials demanded a hefty sum of duty [10] for the special race fuel containing alcohol which was consumed by the supercharged German engines. Both teams withdrew with short notice.
In 1935, [2] the European Championship was resumed, and Rudolf Caracciola took the title by winning three of five championship events. Luigi Fagioli also contributed three to the nine Grand Prix wins of the W25, which in that year was also designated W25B. Auto Union added some more wins, and the government-backed German manufacturer mostly dominated the sport. Nuvolari famously won the 1935 German Grand Prix, but his Alfa Romeo was the only non-German car to win a European Championship race from 1935 to 1939.
Development of the chassis and the car had allowed to increase capacity to more than 4 litre, and output of the new engine version M25C [11] was well over 400 hp. As the M25 engines became unreliable when enlarged to 4.7 litre and 490 hp, a V12 engine was tested, but it proved too heavy. To accommodate it, the chassis was lightened and shortened (thus K for kurz), but this worsened handling. Thus, in 1936, the W25K was often beaten by Auto Union's Bernd Rosemeyer. Only Caracciola could take two wins, one at the twisty circuit of the very wet 1936 Monaco Grand Prix. Mercedes decided to skip the rest of the season to concentrate on development. By driving the race car himself, young engineer Rudolf Uhlenhaut determined that the W25 had a too stiff suspension in a too soft chassis, which made handling difficult. Even though new rules would come in effect in 1938, he set out to develop a new car for 1937, the Mercedes-Benz W125, which was very successful in the season it was made for.
For the 1937 Avusrennen, [12] two Streamline V12-powered W25K [13] were entered, as weight and handling was of low importance at the AVUS which had been fitted with a banked north turn. Streamline variants [14] [15] were also used for records attempts. [16]
As part of a partnership between Mercedes-Benz and Nintendo, the Wii U game Mario Kart 8 and its Nintendo Switch port Mario Kart 8 Deluxe feature a W25 Silver Arrow as a playable in-game vehicle, added as part of a post-launch downloadable game update on August 27, 2014. [17]
Parameters | Data | ||||
---|---|---|---|---|---|
Release year | 1934 | 1935 | 1935 | 1936 | |
engine type | W25A | W25AB | W25B | W25C | W25K |
engine | Eight-cylinder four-stroke in-line engine, 5 crankshaft bearings, 2 Increasing Flow Carburetors (Mercedes-Benz), 2 overhead camshafts with spur gear drive, 4-valve technology, 1 Roots compressor , water cooling | ||||
displacement | 3364 cm³ | 3718 cm³ | 3992 cm³ | 4309 cm³ | 4740 cm³ |
bore × stroke | 78 × 88 mm | 82 × 88 mm | 82 × 94.5mm | 82 × 102 mm | 86 x 102mm |
Power (Mean) | 314 hp at 5800 rpm | 348 hp at 5800 rpm | 370 hp at 5800 rpm | 402 hp at 5500 rpm | 453 hp at 5800 rpm |
gear | 4-speed gearbox (installed on the rear axle), gate shifter to the right of the driver's seat | ||||
Chassis | U-profile-ladder frame [18] | ||||
Front suspension | double wishbones with coil springs | ||||
Rear suspension | Oscillating axle (pendulum axle) with quarter-elliptic leaf springs | De Dion axle, Quarter elliptic leaf springs | |||
shock absorber | Friction shock absorbers | hydraulic dampers | |||
Brakes | drum brakes (hydraulic operated) | ||||
Wheelbase | 2717 mm | 2464 mm | |||
Track front/rear | 1422/1473 | ||||
Tank capacity | 215 liters W25 |
The Automobil-Verkehrs- und Übungsstraße, known as AVUS, is a public road in Berlin, Germany. Opened in 1921, it was also used as a motor racing circuit until 1998. Today, the AVUS forms the northern part of the Bundesautobahn 115.
Silver Arrows is a nickname typically given to silver racing cars with a significant connection to a German car manufacturer. Although the term was coined in 1932, it came into popular usage regarding Germany's dominant Mercedes-Benz and Auto Union Grand Prix motor racing cars between 1934 and 1939. The name was later applied to the Mercedes-Benz Formula One and sports cars in 1954 and 1955, then to the Sauber Group C prototype racing sports cars that raced at Le Mans in the late 1980s as well as the McLaren-Mercedes Formula One cars of the late 1990s and 2000s, and is currently applied to the Mercedes-AMG Petronas F1 cars from 2010 to present.
Otto Wilhelm Rudolf Caracciola was a racing driver from Remagen, Germany. He won the European Drivers' Championship, the pre-1950 equivalent of the modern Formula One World Championship, an unsurpassed three times. He also won the European Hillclimbing Championship three times – twice in sports cars, and once in Grand Prix cars. Caracciola raced for Mercedes-Benz during their original dominating Silver Arrows period, named after the silver colour of the cars, and set speed records for the firm. He was affectionately dubbed Caratsch by the German public, and was known by the title of Regenmeister, or "Rainmaster", for his prowess in wet conditions.
Hermann Albert Lang was a German racing driver who raced motorcycles, Grand Prix cars, and sports cars.
Luigi Cristiano Fagioli, nicknamed "the Abruzzi robber", was an Italian motor racing driver. Having won his last race at 53 years old, Fagioli holds the record for the oldest Formula One driver to win a race. He is also the only Formula One Grand Prix winner born in the 19th century, and the only Grand Prix racing driver to have won a championship race in both the AIACR European Championship and the FIA Formula One World Championship.
The Mercedes-Benz W125 was a Grand Prix racing car produced by German auto manufacturer Mercedes-Benz to race during the 1937 Grand Prix season. Designed by head designer Rudolf Uhlenhaut, the car was used by Rudolf Caracciola to win the 1937 European Championship and W125 drivers also finished in the second, third and fourth positions in the championship.
Richard John Beattie Seaman was a British Grand Prix racing driver. He drove for the Mercedes-Benz team from 1937 to 1939 in the Mercedes-Benz W125 and W154 cars, winning the 1938 German Grand Prix. He died of his injuries after his car overturned at the 1939 Belgian Grand Prix.
The 1935 German Grand Prix was a Grand Prix motor race held at the Nürburgring on 28 July 1935.
The Alfa Romeo P3, P3 monoposto or Tipo B was a classic Grand Prix car designed by Vittorio Jano, one of the Alfa Romeo 8C models. The P3 was first genuine single-seat Grand Prix racing car and Alfa Romeo's second monoposto after Tipo A monoposto (1931). It was based on the earlier successful Alfa Romeo P2. Taking lessons learned from that car, Jano went back to the drawing board to design a car that could last longer race distances.
The 1935 Grand Prix season was the second year of the new 750 kg Formula. The success of the previous year encouraged the AIACR to reinitiate the European Championship. It was composed of the seven national Grands Prix and was won by Rudolf Caracciola, driving for the Mercedes-Benz team. The team dominated the season winning five of those Grand Épreuves, as well as four of the other major races of the season. However, in one of the great motor-races in sporting history, Tazio Nuvolari in a Scuderia Ferrari Alfa Romeo beat the combined numbers of the German teams in their home Grand Prix. The season also saw the arrival on the international stage of the bright young talent Bernd Rosemeyer in the Auto Union team.
The 1932 Grand Prix season marked the second year of the AIACR European Championship. It saw the debut of Alfa Romeo's sensational new Tipo B and with it, Tazio Nuvolari won the Championship driving for the Alfa Corse works team. The 40-year old Nuvolari won two of the three rounds and was second in the other. Still running to a Formula Libre rules for the cars, the regulations were revised to set the races to be between five and ten hours. However, all three national committees ran their races to the minimum time-limit.
The 1934 Grand Prix season saw the advent of the new 750 kg Formula. In an effort to curb the danger of rising speeds, the AIACR imposed this upper weight limit that effectively outlawed the large capacity engines. The incumbent manufacturers Alfa Romeo, Maserati and Bugatti had been preparing their new models with varying success – the best of which was the Alfa Romeo Tipo B. However, it was the state-sponsored arrival of the two German teams, Mercedes-Benz and Auto Union, and their innovative and progressive cars that ignited a new, exciting era of motor racing.
The Mercedes-Benz W154 was a Grand Prix racing car designed by Rudolf Uhlenhaut. The W154 competed in the 1938 and 1939 Grand Prix seasons and was used by Rudolf Caracciola to win the 1938 European Championship.
The Auto Union Grand Prix racing cars types A to D were developed and built by a specialist racing department of Auto Union's Horch works in Zwickau, Germany, between 1933 and 1939, after the company bought a design by Dr. Ferdinand Porsche in 1933. The Auto Union type B streamlined body was designed by Paul Jaray.
Otto Merz was a German racing driver, chauffeur and mechanic. He was a driver in the motorcade during the 1914 assassination of Archuduke Franz Ferdinand and later won the second running of the German Grand Prix in 1927. He died in a crash during practice for the 1933 Avusrennen in a modified Mercedes SSK on 18 May 1933.
The Mercedes-Benz W165 is a racing car designed by Mercedes-Benz to meet voiturette racing regulations. It won its only race, the 1939 Tripoli Grand Prix, driven to a 1–2 victory by Hermann Lang and teammate Rudolf Caracciola.
August "Bubi" Momberger was a German racing driver and engineer, who competed in Grand Prix motor racing events for various manufacturers between 1926 and 1934. During the 1934 Grand Prix season – the first season of the infamous Silver Arrows period of German dominance of Grand Prix racing, that would last until the outbreak of WWII – he drove for the Auto Union Rennabteilung, and was the first driver of a Silver Arrows car to take a podium finish in a major race. During the season he took a further second-placed finish, and posted two fastest laps, but worsening arthritis and a deteriorating relationship with the Auto Union team manager forced him into retirement before the end of the year. Following his retirement from racing, Momberger returned to his engineering training and rose steadily through the ranks of the German automobile industry, eventually becoming technical director of the Borgward company's Goliath division in Bremen.
The 1934 Avusrennen was a non-championship Grand Prix held on 27 May 1934 at AVUS in Berlin, Germany. It was the 10th race of the 1934 Grand Prix season. The race, which was 15 laps, was won by Guy Moll driving an Alfa Romeo Tipo B/P3 after starting from 9th place.
Mercedes-Benz made a series of pre-war supercharged Grand Prix racing engines for their Silver Arrow race cars; between 1934 and 1939. They made two supercharged inline-8 engines; the M25 and M125, and one V12 with two generations; the M154 / M163.
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