2 different kind of "lenght" concept...
f1 have come to be almost 6m long because longer car = longer wheelbase = longer diffuser = more underbody downforce created that generates less drag than downforce created by wings/bodywork. A longtail sportscar is designed to improve aero efficiency, it basically helps to reduce drag but it doesn't create much downforce without a diffuser of the same lenght.
I think LMH and lmdh will be about 5m long because those extra 30-35cm will be used to design longer diffusers, copying what f1 teams are doing since 2017.
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