The 1930s saw the transformation from high-priced road cars into pure racers, with Delage, Auto Union, Mercedes-Benz, Delahaye, and Bugatti constructing streamlined vehicles with engines producing up to 450 kW (612 hp), aided by multiple-stage supercharging.
From 1928-1930 and again in 1934-1936, the maximum weight permitted was 750 kg, a rule diametrically opposed to current racing regulations. Extensive use of aluminium alloys was required to achieve light weight, and in the case of the Mercedes, the paint was removed to satisfy the weight limitation, producing the famous Silver Arrows.
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