For example, a submarine has to overcome the drag exerted on it by the water it is moving through. Drag is the name for a type of friction-a force that is exerted in a direction opposite to the one in which an object is traveling. The second reason is what is known in physics as drag. These are large vehicles that are heavy even when the semi trailer is empty and they are much heavier when the trailer is fully loaded. The first is their weight, about which very little can be done, of course. There are a couple of reasons that trucks get such poor gas mileage, particularly when pulling a semi trailer. And the more improvements you make, the more you save-especially if you’re operating a fleet of trucks and semi trailers. With fuel costs always increasing (even after occasionally plateauing or even dropping temporarily) and big rigs averaging about 6 miles per gallon (mpg), any improvement in a vehicle’s aerodynamics can produce savings. ![]() It would be easy to dismiss aerodynamics as something that trucking companies and others that transport their own products and materials don’t have to be concerned about, if not for the fact that doing that can cost you money. As Wikipedia explains: “ Aerodynamics is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing.” Or, for the transportation industry, a truck and semi trailer.
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