...from earlier today.
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I think I will need pictures of most of these ideas.
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The search field is in the upper right. I apologize for being lazy.
- diverter...stagnation point
- air curtains...spats.
- Aerocivic
- fender skirts...TurnpikeCruiser
- fiberglass...the proper curve.
You've already got vortex generators on the back. Aren't they working? See
Gurney flap. Since you went thumbs down on the boat tail, I'll include a picture for that.
The proportions would change for your vehicle. It could have a piano hinge at 18-24" and dispense with the 'stinger' that stores over the roof in this instance.
It might have a vertical hinge at one end of the bumper and a retractable leg with a caster wheel on the other.
Here's another thing:
Which topper has the lowest Cd?
The slick-top is 0.44, The bubble-top is 0.40 because of the arched profile. The area is larger, of course. You'd need only do the back half. Those divots in the front are facing onrushing air. "It isn't how big a hole you make, it's how big a hole you leave."