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Addressing aerodynamics of a big box? there could be some improvements, but not many. Been looking for a stream here that could be scaled up from a van.
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Like this?
https://www.dfrc.nasa.gov/Gallery/Ph...uck/index.html
I know aerohead has analyzed this in the past, here is one specific thread.
ecomodder.com/forum/showthread.php/plan-my-cargo-trailer-30395.html#post453403
Long story short, the brick is the same on the underside. I posted about
my design for a semi-rigid boat tail after you posted about the Trucksack in 2020.