The sound* is of a T35B driven post-WW2 on an ordinary road, so not at full racing speed, and mostly recorded from the cockpit. Stewart Tresilian, who raced a T35 at Donington, once said that the “tearing calico” sound of a prewar Bugatti at speed was caused by the rock-hard springs causing the narrow tyres on a less-than-smooth track to slip and grip!
*youtube.com. Sports Car Digest.
His T35B was painted British Racing Green, presumably because it had been bought for him by a girl friend (D/Tel. 30 March 2002. In DASO 887 he is described as a Bugatti works driver, which apparently was not the case on that occasion). The headgear was not even a flying windcap but was an ordinary flat cap worn back-to-front!.
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