M-245 CMC Mercedes-Benz 300 SLR Coupé Chassis No. 0007/55, RCA Trouist Trophy 1955

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Description

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When Rudolf Uhlenhaut, the architect of the 300 SLR racer, was at the 1955 Mille Miglia to watch Mercedes’ success, he was also mulling over the idea of fitting the 300 SLR racer with a closed top for endurance events in the future.
 
His musings came to fruition in the shape of a competition coupé with the performance that no other road-going sports car could match. The two-seater recorded a speed of 290 km/h during a test on a closed section of motorway outside Munich. Impressed by its extraordinary performance over a cross-country trek of 3500 km (over 2000 miles), the test reporter from the Swiss magazine Automobil Revue had this to say:

“We are driving a car which barely takes a second to overtake the rest of

  the traffic and for which 200 km/h on a quiet motorway is little more than 

  walking pace. With its unflappable handling through corners, it treats the 

  laws of centrifugal force with apparent disdain …”

The 300 SLR racer was based on the famous W196 Formula One champion of the 1954-55 season. The abbreviation SLR stands for Sport Light-Racing (Sport Leicht-Rennen). Considered one of the most beautiful racecars of all time, the new SLR was equipped with a slightly different straight-eight engine, which was expanded to displace 3 litres. Two of the nine 300 SLR rolling chassis, namely 0007/55 and 0008/55, were converted into 300 SLR Coupés with a closed-top body and gullwing doors. They were intended for the forthcoming Carrera Panamericana.

The body of the SLR coupé was panelled in sheet Elektron, a magnesium alloy that is even lighter than aluminum. The semicircular windscreen generated very little wind resistance. As in the SLR racer, the coupé driver had to control the pedals with his legs apart behind the steering wheel. Under the bonnet was a longitudinally-mounted eight-cylinder engine, which was placed just behind the front axle, developing peak torque of 234 lb-ft at 5950 rpm and a maximum output of 310 horsepower at 7400 rpm.

Owing to safety concerns following the tragic accident at Le Mans back in June, Mercedes-Benz decided to pull out of motorsport at the end of 1955. As a result, the SLR coupé project was shelved and never went into production. Subsequently, Rudolph Uhlenhaut appropriated one of the coupés, chassis for his personal use. Weighing only 1,117 km and capable of 290 km/h, the Uhlenhaut coupé was by far the fastest road car of its time in the world. 

Although the 300 SLR coupés stopped short of racing seriously, chassis 0007/55 was no stranger to motorsport racing. After the 1955 Swedish Grand Prix, it showed up again at the RAC Tourist Trophy that took place at Dundrod, Northern Ireland on September 17, 1955. 

To get back in the hunt for championship, the Mercedes Squad took this race very seriously. They left nothing to chance and had brought no fewer than five SLRs. Two were assigned for practice – chassis 0007/55 as TI (closed-top) and 0002/55 as T2 (open-top). The three SLR racer pairings were Fangio/Kling, Moss/Fitch, and von Trip/Simon. As a newcomer, Wolfgang von Trip was made to drive chassis 0007/55 all the way from Stuttgart. In the practice session, he split the use of chassis 0007/55 with Moss, Fangio, Kling, and Uhlenhaut. Together, they raced the T1 for 357 kilometers.  

After two days of practice, the entry of 55 cars was whittled down to 49 starters. Eventually the Germans finished in the first three places on September 17, with Moss/Fitch placing first, followed by Fangio/Kling in second place and then von Trip/Simon. September 17, 1955 happened to mark Stirling Moss’ 26th birthday, too.  

Technical Data:

  • 8-cylinder in-line engine (installed in a 33° inclination to the right side)
  • Direct fuel injection (positively controlled valves)
  • Desmodromic valve control
  • Underbody: wishbone in the front, single hinged swing axle in the rear.
Maximum output: 310 hp at 7,500 rpm
Displacement: 2,982 ccm
Top speed: approx. 300 km/h
Wheel base: 2,370 mm
Total length: 4,315 mm
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