Indeed, similitude. You have to slow down the air flow on the model until the Reynolds number is the same as on the full size truck.
Where did you get that scale model? It is exactly the same as my truck.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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