What effect is achieved by installing an aerodynamic deflector on the roof of a truck cab?

Question

DentroTest · Accepted Answer

The roof deflector is an aerodynamic element located above the cab whose purpose is to soften the impact of the air against the bodywork or the semi-trailer behind it. By channeling the air upward and to the sides, it reduces drag, that is, the aerodynamic force opposing motion, and fuel consumption is reduced as a result. It does not make it necessary to distribute the load strictly symmetrically: proper weight distribution is a matter of respecting the maximum masses per axle and the position of the center of gravity, and it has no relation to the deflector. Nor does it reduce the stability of the vehicle, because channeling the air reduces turbulence and does not harm stability.

What effect is achieved by installing an aerodynamic deflector on the roof of a truck cab?

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