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Playing with flow illustrator and windtunnel 2d now... Seeing if there's anything else that can be tested...
Deflector definitely is better than a gap filler, at least in the theoretical world of CFD in 2D...
Been playing with a wing design - see if one of those oldschool wings like we used to have on vans & hatchbacks in the 80s makes a difference (kick some air down behind the RV) but looks like for it to be effective it'd have to be 16" over the back to catch some clean air...
Interesting pressure zones between truck & 5th, not sure if this is 2D effect or real...
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