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Old 07-21-2021, 03:14 PM   #21 (permalink)
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For sure!
If you could seal as much of the gap between cab and box, that would also show. ( delta-Cd 0.016 on my pickup )
Also, extend the box sides down even with the bottom elevation of the running boards / step.
Wheel arches?
I'm actually looking at raising the steps or increasing tire size. This will not be a on-road only vehicle. I'm not looking for a rock-crawler but it needs to be handle forest service roads



M2 ambulances come standard with 19.5 inch wheels. I'll have to see what is required to fit 22.5 inch wheels. Nothing extreme like this truck


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Old 07-21-2021, 04:05 PM   #22 (permalink)
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That example would need an ogive curve that follows the sweep of the opening door and then goes convex at 4% of the overall width.
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Old 07-21-2021, 04:33 PM   #23 (permalink)
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Treat yourself to this



Seriously though, I'm getting excited for your retirement plans. Swing by and visit Silverton when you embark and I'll send some beers along for your travels.
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Old 07-21-2021, 07:27 PM   #24 (permalink)
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Treat yourself to this

$700K !!!! I could buy 6 rental houses with the difference in vehicle costs.


Quote:
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Seriously though, I'm getting excited for your retirement plans. Swing by and visit Silverton when you embark and I'll send some beers along for your travels.
Thanks. I do make it down that way every now and then but usually on short notice.
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Old 07-22-2021, 10:39 PM   #25 (permalink)
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$700K !!!! I could buy 6 rental houses with the difference in vehicle costs.
Everything seems to be more expensive when it's meant for motorhomes and campers.
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Old 07-23-2021, 11:06 AM   #26 (permalink)
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a look at Cd 0.38

https://ecomodder.com/forum/member-a...here-money.jpghttps://ecomodder.com/forum/member-a...nt-attacks.jpghttps://ecomodder.com/forum/member-a...-windkanal.jpghere's a link to a dated Mitsubishi box truck worth looking at. Some box truck at the time were near Cd 0.90.
https://ecomodder.com/forum/member-a...aero-truck.jpg
You can get away with murder at the front, but gaps are expensive, and transitions to the 'roof' need to be 'tuned'. You'll notice flow separation on the roof of the trailer van.
On the way to see the Dynaxion Car, at Harrah's Auto Museum, Reno, Nevada, I snapped this shot of leading-edge 2-D flow separation on a bridge abutment under a bridge over the Truckee River. It offers a clue as to aerodynamic challenges with 'hard' edges.
Finally, Hucho's iconic image of a squareback wake, which you'll never find used in nature.
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Old 07-23-2021, 04:03 PM   #27 (permalink)
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We'll cheap out on the formwork for the abutment, but people can see the brackets so we'll make them Art Deco Streamlined.
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Old 07-23-2021, 06:16 PM   #28 (permalink)
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a dated Mitsubishi box truck worth looking at
And those forward-control trucks are quite harder to streamline than the average American truck with a conventional cab.
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Old 07-23-2021, 07:58 PM   #29 (permalink)
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A Freightliner FLD - that is step back in time! (Produced from 1987 - 2010) Freightliner's first "aerodynamic" truck build before Freightliner had their own wind tunnel.

Which is part of the problem. Plenty of things that "look" like they should be aerodynamic aren't actually. For example you may think extending side fairings on a truck back to the rear wheels would be better than a short fairing. However, that isn't always the case. The early full wheel to wheel fairing on a Cascadia is less aerodynamic than the later model short fairing that stops even with the cab extenders.




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