OP tries to slip one past us, but Youtube puts it on (at least my) front page:
TLDR; front undertray gives 45% benefit on the underside.
edit:
Further down the page: Julian's grumpy video
2nd edit:
Make your own steel offcuts storage rack
I just use five-gallon buckets.
Car aero tricks and tips from the past
I had one of the examples, a 1961 Type II [panel van]. They came with a optional three piece bellypan between the axle lines:
(DDG, original page 404s)
But I believe these parts were used to stiffen the shell in the 23-window variants.
I would assert that the VW Beetle has a blown wake.  1500cfm, IIRC.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
Last edited by freebeard; 04-26-2020 at 04:39 PM..
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