1970 Mercedes Benz C 111 Ii Concept
Mercedes-Benz C 111-II Concept
When Mercedes-Benz introduced the Mercedes-Benz C 111-II Construct at the Hollands Centrifugal Prove in Butt 1970 it was the farce of dreams: breathless eubstance figure, advanced materials and pioneering engineering – not to credit top-level operation. An procession growth of the cogitation that had been furnished with a three-rotor Wankel locomotive and presented at the 1969 Outside Motive Prove (IAA) in Frankfurt am Primary, this variation made its Hollands introduction boast a four-rotor Wankel locomotive development capable 257 kW. The locomotive, a DB M950 KE409 example, had 600 three-dimensional centimetres of intensity per orbitual plunger and was the about advance of the orbitual plunger engines highly-developed at Mercedes-Benz. The locomotive hereditary its exponent to the bum wheels via a five-speed transmittance, accelerated the Mercedes-Benz C 111-II from a standing first to 100 km/h in 4.8 seconds and gave a top swiftness of 300 km/h.
Therein variation of the supersports car, calico an orangish-red semblance known as “Weißherbst”, the engineers succeeded in determination the perfective set-up for the mid-engined putsché with its classifiable gullwing doors. For in add-on to a new locomotive, the Mercedes-Benz C 111-II Conception too boasted a limited torso. As it appeared in Hollands, the car was often more hardly a quiz fomite for the groundbreaking ride construct highly-developed by Felix Wankel. Since the launching of the externalize in December 1967 Mercedes-Benz had highly-developed a top-class supersports car with the wherewithal to fulfil the gap remaining by the Mercedes-Benz 300 SL (W 198 serial). The enthusiastic answer from visitors to the Hollands Drive Demonstrate confirmed this aspect. Orders were standard flush earlier the Stuttgart society had set a cost for the new gullwing – many oblation downpayments or dummy cheques.
1970 Mercedes-Benz C 111-II Concept
One melioration concluded the Mercedes-Benz C 111-I was the new example’s improved flowing efficiency: the puff coefficient of cd=0.325 was exceptionally low for the menstruum. Simultaneously, driver profile was improved. With the limited torso and new Wankel locomotive, which now highly-developed torsion of 40 mkg (392 N metres), no modern-day road-going supersports car was a equal for the Mercedes-Benz C 111-II Construct.
And yet Mercedes-Benz distinct against serial product. “The Wankel locomotive was not yet grow plenty to be handed ended to customers in job with caller standards,” aforesaid Dr. Hans Liebold in the class 2000, the man who had been responsible underdeveloped the Mercedes-Benz C 111, from the kickoff Wankel field compensate capable the ulterior record-breaking cars with reciprocating plunger locomotive. Furthermore, progressively tight emissions regulations in the Joined States of America argued against the founding of the roundabout plunger locomotive, for although it had distinctive fire expenditure figures for the menstruation (“an median of 20 litres/100 km”, according to an issuing of the cartridge motorcar motive und variation dated 11 April 1970), emissions values were clearly on the gamey english. A shortstop clip late, the oil crisis put an end to all bright meditation regarding the takeoveré’s grocery plunge.
By this meter the developing section at Mercedes-Benz had mostly got to grips with the technology conception problems of the circle plunger precept, specially in footing of locomotive mechanism. But the comparatively misfortunate efficiency of the Wankel locomotive, which resulted from the lengthened, varying burning chambers of the roundabout plunger rationale, could not be circumvented by proficient modifications. The job was but built-in in the conception: in a Wankel locomotive, the fire burns in the infinite ‘tween the bulging position of the roundabout plunger and the concave paries of the plunger trapping, instead than in the cylindric burning bedchamber of a reciprocating-piston locomotive. The varying and less than compress burning chambers of the Wankel locomotive were responsible miserable thermodynamical fire saving compared with a reciprocating-piston locomotive, resulting in importantly higher fire ingestion for the like outturn.
On the otc give, the locomotive had the advantages of a extremely compress excogitation and quietude eve – piece beingness compulsive for sports operation. In November 1969 Ron Wakefield besides discussed the Mercedes-Benz C 111 in the barter cartridge Route & Cartroad: “During my outset drive I was now smitten by the quietude of the mightiness whole inwardly the car. It was far quieter than, say, a 12-cyl. Lamborghini Miura.”
In retrospect, Dr. Kurt Obländer, head of engine testing for the Mercedes-Benz C 111 project, described the Wankel engine as follows: “Our four-rotor engine with gasoline injection represented the optimum of what could be reached with this engine concept. The multi-rotor design called for peripheral ports for the intake-air and exhaust-gas ducts. We were able to solve the difficult problems in engine cooling and engine mechanics by technical means. But the concept’s main problem – its low thermodynamic degree of efficiency – persisted.”
At just 1.12 metres in height, a number of details about this flat sports coupé made reference to the history of Mercedes-Benz supersports cars. Such features included the gullwing doors, reminiscent of the 300 SL, and the consistent use of innovative drive technology in a high-performance automobile. Unlike the 300 SL (spaceframe with steel and aluminium skin), however, the Mercedes-Benz C 111 had a body made of glass fibre reinforced plastic, which was bonded to the steel floor assembly.
Ultimately, the reason the Mercedes-Benz C 111-II Concept became such an object of desire among the public – in spite of being officially presented as a study and experimental vehicle – was down to the high standards Mercedes-Benz set itself. For during its development, the sports car was never treated merely as a test vehicle. Rather, the engineers looked beyond the innovative drive and body features, applying themselves to the vehicle setup and creating a holistic concept that also embraced design of the interior, noise insulation and chassis optimisation. When the Mercedes-Benz C 111-II Concept appeared at the 1970 Geneva Motor Show, it inspired the feeling of a supersports that had been built as an integrated whole – an automotive dream that was close enough to touch.