Quote:
Originally Posted by KamperBob
The blunt rear without tapering isn't helping.
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It's probably the worst area, as bluntness on the front isn't that bad for aero.
Bulging the front would help though, as would a vertical divider plate along the centerline.
(Don't use a half-round fairing on the rear though.)
Quote:
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It's possible to build out the sides to swallow the fender with tapering to the top for smooth transition and angling to the rear for clean separation.
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Yep, bulge on the front of the fenders, covering their sides, and tapering as slowly as possible on the rear of the fenders.
Adding slightly angled plates to the rear of the trailer would also help to reduce the wake area - and cut down the drag.
See
Semi-truck Boat Tail Improves Fuel Efficiency 7.5% | Watts Up With That?
and
Platform for Aerodynamic Road Transport
(take a look at applications -> cab and container)