W125 Slot Car Illustrated Forum

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Mercedes-Benz W125

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The W125 was a Grand Prix car designed by Rudolf Uhlenhaut to during the 1937 Grand season. The car was used by Rudolf to win the 1937 European Championship and drivers also finished in the third and fourth positions in the

The supercharged engine, with 8 in line and 5577cc (340.3 attained an output of up to 595 horse (444 kW). In 1938, the capacity of supercharged Grand cars was limited to 3000cc, and the was replaced by the Mercedes-Benz W154.

The was considered the most powerful car ever for about 3 decades, large capacity US-built V8 in CanAm sportcars reached power in the mid 1960s. In Formula One itself, the figure was not exceeded the early 1980s, with the of turbo-charged engines in Formula

The W125 reached race of well over 300 km/h mph) in 1937, especially on the in Berlin, equipped with a body.

In land speed runs, a Mercedes-Benz W125 was clocked at 432.7 km/h mph) over a mile and a

Due to the uncompetitiveness of their W25 car, pulled out of the 1936 Grand Season midway through the in order to concentrate on designing a car would see them return to the top of the A new racing department (‘Rennabteilung’) was set up Mercedes-Benz in order to work on the Rudolf Uhlenhaut, previously a car engineer for the company, was selected to the design team. Uhlenhaut had not designed a racing car, but had experience testing road on the Nьrburgring race track, which allowed him to adapt his relatively easily to race

When testing the old W25 car, remarked that the suspension was too preventing the wheels from the road. During the test a wheel came off the car, yet continued to drive the car as if nothing had This stiffness caused the to flex and the rear axle to by up to 7-10 cm (3-4 inches) braking. The brief for the new car included a chassis and more travel on the to avoid the problems experienced in the car


The W125 had a much stiffer frame construction compared to the W25 model. This was achieved oval tubes made of molybdenum which flexed less than the steel used in the W25.

The bodywork of the was aluminium metal, which its predecessor was left unpainted in its silver colour. This Mercedes’ cars during period (and rivals Union, whose cars the same colour) the nickname of Arrows.

With no regulations engine size, other the 750 kg total car weight limit, designed a 5.6 litre engine with eight inline and an overhead camshaft for the W125. the M125, the engine was also with a Roots type producing 632 lb·ft (857 of torque at the start of the season. The built varied in power, an output between 560 and 595 horse (418-444 kW) at 5800 rpm. used was a custom mix of 40% methyl 32% benzol, 24% ‘A’thyl alcohol and 4% light.[1] The engine weighed 222 kg lbs) — approximately 30% of the weight of the car, and was mounted in the of the car.

Like its W25 predecessor, the W125 a 4-speed manual transmission. The design was changed to a constant type, which provided reliability compared to the unsynchronized of the M25. In a constant mesh the transmission gears are always in and rotating, but the gears are not rigidly to the shafts on which they Instead, the gears can freely or be locked to the shaft on which are carried. The previous unsynchronised required the gears to be spinning at the same speed when otherwise, the teeth would to mesh.

The W125 made its competitive outing in May at the 1937 Grand Prix with entering four cars. Hermann Lang won his first Prix motor race to the W125 a victory on its dйbut and Mercedes with their victory over rivals Union since May 1936. The race was held at the AVUS circuit in Germany, a 12-mile (19 km) circuit consisting of two long of approximately 6 miles (10 km) length at either end by a curve. As such, it was for a car to reach its top speed. Mercedes two W125 cars, a streamliner was modified from the original to increase its top speed on the straights and a car driven by Richard Seaman in of problems with the streamliner. The had a top speed 25 km/h (16 mph) than the regular car. On lap of the race, the streamliner retired leading due to a gearbox failure. regular W125 finished in position.

Hermann Lang drove a to victory on its dйbut. At the Eifelrennen at the Nьrburgring circuit, Mercedes five W125’s, including one by Christian Kautz fitted the new suction carburettor supercharger Kautz finished in ninth, team-mates Rudolf Caracciola and von Brauchitsch finished in second and places. For the next race, split their entries two races which occurred a week of another. Two cars sent to the USA to compete in the Vanderbilt one of which was fitted with the carburettor supercharger used on car, and three cars to Belgium to compete in the first of the 1937 European Championship. Seaman finished second in the and third and fourth place achieved in the Belgian Grand Following Seaman’s success in the with the new supercharger system, it was to all of the W125s.

The following two races also both part of the Championship. The next round in saw both Mercedes and rivals Union competing on home Mercedes triumphed, as Rudolf took his first victory of the and Manfred von Brauchitsch followed him in second position. In the next at Monaco, the positions were as von Brauchitsch won and Caracciola finished in A third Mercedes W125, by Christian Kautz, took place.

The non-championship Coppa Acerbo in was the next event the W125 During practice Richard crashed into a house and his car. Therefore only von and Caracciola started the race. the race, Seaman took from Caracciola and despite an fire, he finished the race von Brauchitsch fared better in second position. The Swiss Prix was the penultimate round of the European Championship. Like in Mercedes W125s finished in the top places, Caracciola taking the win Hermann Lang in second and von third. The final round of the marked a return to Italy, at the Livorno Circuit, Caracciola off team-mate Lang to win the race by 0.4 and become European Champion. von retired from the race and second place overall in the Kautz and Lang took and fourth places meaning drivers occupied the top four in the championship table.

The W125 into two non-championship events the end of the season. The Masaryk Grand in Czechoslovakia gave the W125 its victory when Caracciola won the von Brauchitsch finished second and came in third. The race was as Hermann Lang had crashed spectators on lap five, resulting in injuries and two deaths. The final race Mercedes entered the into was the 1937 Donington Prix. Rosemeyer prevailed, von finished in second place and in third while both of the W125s failed to finish. The ERA were outclassed, failing to get in their home race.

Mercedes-Benz W125

1938 saw changes in the rules, the maximum limit on weight replaced with a maximum on engine capacity and a minimum for the car being introduced. As such the would not be eligible for entry heavy modifications. Instead, developed a new car, the Mercedes-Benz and the W125 was withdrawn from

Some long time ago I up an Auto Union by Pink Kar and extensive mods to the guide and a motor swap to an S can, job, and decals, had produced a pre war Grand Prix car from an era produced powerful technological ahead of their time. I converted a Revell kit of a later Union to run on a Strombecker Scuttler from the 60’s. But a Mercedes me.

That is it eluded me till I one up from a dealer in England. It was an Airfix body kit with and tires, no motor. So the work The steering unit at the front was with a brass bracket I from an E.J.’s chassis I had around. I replaced the rear with a stock Scalextric but used the original bushings as have a tringular shape fits into the bottom of the car. I used another of front wheels from an Vanwall to narrow the track and classic F1 rear tires. The tires and wheels came the kit though I removed some of the hub, again to narrow the Power is a standard S can and guide is Its amazing what you can create stuff in the spares box. sure if I orderd up some Pit stop tire and wheel or some other wire I’ve seen I could improve the look of this car and the but again there is something to be for maintaining the more toy like of the original product.

I prefer to paint cars of era with a brush and Tamiya colour paint as the cars in looked somewhat scruffy.

I liked the head and shoulders provided so I used him and with a bit of and cut and paste from an E’J.’s at least gave him the illusion of and hands.

Now true to the era of production Airfix model is hard to but near as I can identify I’d say its an at an early W125.

Over all the is a nice running mate for the The Silver Arrows certainly impressive.

Good day, eh!

edited by ferrari1950; 07-09-2008 at AM .

Mercedes-Benz W125
Mercedes-Benz W125
Mercedes-Benz W125
Mercedes-Benz W125

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