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Mercedes-Benz SLS AMG Roadster - Page 3

The new Mercedes-Benz SLS AMGA few specific modifications to the aluminium spaceframe

Owing to the omission of the coupé roof and gullwing doors, the open-top SLS AMG has a reinforcing cross-member behind the seats which supports the fixed rollover protection system. Not forgetting the 250-watt subwoofer of the Bang&Olufsen BeoSound AMG high-end sound system: This is accommodated in the cross-member, as the Coupé-specific location on the parcel shelf is not available owing to the Roadster's soft top. One particular challenge was acoustic insulation of the cross-member, which acts as a subwoofer housing for the two 165-millimetre speakers connected in series. Numerous improvements became necessary before the required listening pleasure was achieved. It was only with the help of a special bulkhead within the aluminium cross-member that all audiophile standards could be satisfied. The three-layered fabric soft top of the SLS AMG Roadster, which is deposited behind the seats in a Z-formation to save space, is also an aspect relevant to handling dynamics. This weight-optimised, combined magnesium/steel/ aluminium construction ensures a low centre of gravity and is designed for speeds up to the maximum of 317 km/h (electronically limited). Whether open or closed, even at top speed there must be no intrusive flapping, booming, hissing, clattering, whistling or howling.

Likewise the push-on glass draught-stop and the panelling in the interior, on the soft top and along the beltline must be vibration-free. Nothing must be allowed to compromise the open-air enjoyment. The basis for verified, customer-compatible results in extreme conditions is provided by precisely defined test drives on the high-speed tracks in Papenburg, Nardo (Italy) and Idiada (Spain). The excellent acoustics – which AMG engineers have naturally also verified with sophisticated measuring technology – also benefit from another special feature, namely the seamless, bonded-in rear window of single-layer safety glass. A special production process not only ensures a smooth transition between the outer skin of the soft top and the glass, as the sum of these design measures also leads to low wind noise when the roof is closed – at any speed.

The new Mercedes-Benz SLS AMG

125 years of experience with innovations in open-top vehicles

Ensuring that the soft top is wind and waterproof is a complex undertaking, and AMG and Mercedes-Benz have used the enormous experience gained during 125 years of innovation. There have always been open-top vehicles in the history of Mercedes-Benz – and unlike in the case of many competitors, in an uninterrupted sequence. Every soft top is different, however, and even objectives already defined become more ambitious over time. The five challenges to which the AMG developers of the SLS AMG Roadster gave great attention and commitment were water, sand, dust, heat and cold. One special feature of the compact soft top is the continuous water pocket: this is attached below the soft top to catch rainwater and direct it down to the underbody via two apertures on each side. All the development aspects of a vehicle which involve flexible deformation are always very complex. Simulations can sometimes lead to false conclusions, and do not always provide the most cost-effective solution. Classic test procedures often help to achieve rapid results. Development project manager Holger Strahl (34): "In this field it is not possible to simulate everything with CAD, and it becomes a matter of trying out, driving, testing and improving. The solution finally approved must also be suitable for series production, of course. Our specialist departments and the overall development team work together very closely in their common search for the perfect solution." He also adds: "There is no such thing as the second-best alternative for AMG."