Trailer Underbody Devices
Air flowing under the trailer body decreases fuel economy. However, aerodynamic drag under the trailer is complicated especially when ambient winds are not aligned with the tractor and trailer.
Bogie fairings are one type of underbody device. The benefit of the bogie fairing type of system is that it provides greater clearance and access under the trailer than with full skirts.
Other new products are reaching the market that offer more clear space under the trailers than full skirts.
Fleets should also know that underbody devices can collect ice and snow in winter conditions, and this can impact aerodynamic performance, as well as adding weight to the vehicle and reducing its freight load potential or resulting in overweight fines at inspection stations.