Quote:
Originally Posted by aerohead
Vortex generators were designed to allow flow reattachment at steep angles,onto a trailing structure.
Truck vans have nothing behind them to reattach to.
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They don't need that if they can
make it quite literally
out of thin air with energised air.
Keeping the tailgate closed also helped as it created a bubble of air in the bed - where physically there's nothing there (but air).
Rear spoilers on a trunk that end up on the template also reduce FC, despite the sharp drop on the rear window.
Simple, flat end-plates on sticks reduce FC when the plates are sized to what a full boattail would be like at that distance.
So apparently, you don't necessarily need full-featured, physical hardware right up to the tail to better streamline a vehicle.
You likely won't get the maximum benefit out of them, but you also don't get the various inconveniences of a physical boattail.
If these vortices can enclose a boattail-bubble of air, you've boattailed the truck with ... nothing but air.