Originally Posted by
BlazingPedals
I thought the purpose of a spoiler was to use airflow to provide more downward force on the wheels for more traction. IOW, reverse lift. They are used in automotive applications (i.e. racing) in spite of their aerodynamic cost, not because of it.
Fairings and diverters, OTOH, are meant to smooth the air flow.
We are talking about the kind of spoiler used on an Eighteen Wheeler, to divert air from the front of the trailer.
One more picture; the Type Eleven, with its Corrugated Plastic Spoiler, recently wrapped in Gift Wrap for decoration:
Again, we are working on the premise that a Semi-Truck's Spoiler deflects air over the gap between the Tractor and the Trailer. It is NOT the intent to create downforce, as with a Nascar Spoiler. But the Trailer is technically *drafting* behind the Tractor. Got it?