Quote:
Originally Posted by Xist
Apparently, the wind tunnel was not long enough for a semi and trailer, so they used a 1/4-scale model.
Couldn't they have used a real semi with a short trailer?
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No.
Length is an important factor, so changing it would require corrections - and those would first need to be calculated as well.
The corrections required when using models in windtunnels are well known, OTOH.