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Re:Why are semi trucks in the US and Europe so different? (2... by froh on Thursday February 03, 2022 @01:16PM (#30196301)
Actually having a smooth undercarriage and a smooth transition from truck to trailer and some wind breaking fins reduce drag a lot.

https://en.vda.de/dam/vda/publications/FAT-SCHRIFTENREIHE%20...

And the front aerodynamics dépend more on the details than it's length. Some aerodynamic designs have shockingly steep fronts.

https://en.m.wikipedia.org/wiki/Schl%C3%B6rwagen

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