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Search took 0.01 seconds. Search: Posts Made By: Engeu1
Forum: Aerodynamics 06-29-2020, 05:59 AM
Replies: 84
Views: 9,412
Posted By Engeu1
Presumably due to ground effect and weather at...

Presumably due to ground effect and weather at ground level? Equally, that should not rule out positive results around ideal conditions.



But it's a matter of net cost-benefit.



No, but...
Forum: Aerodynamics 06-29-2020, 05:28 AM
Replies: 84
Views: 9,412
Posted By Engeu1
I think that's not the 2013 German language...

I think that's not the 2013 German language version you're referencing [translated] 'Hucho - Aerodynamics of the automobile: fluid mechanics, heat engineering', I see online that the page is about...
Forum: Aerodynamics 06-29-2020, 05:18 AM
Replies: 84
Views: 9,412
Posted By Engeu1
Is that the horizontal length for a vertically...

Is that the horizontal length for a vertically mounted device? Surely it must also depend upon flow speed?
Forum: Aerodynamics 06-29-2020, 05:14 AM
Replies: 84
Views: 9,412
Posted By Engeu1
See figure 12 in 2012 Khalighi et al....

See figure 12 in

2012 Khalighi et al. Unsteady Aerodynamic Flow Investigation Around a Simplified Square-Back Road Vehicle With Drag Reduction Devices J. Fluids Eng. Jun 2012, 134(6)

for a very...
Forum: Aerodynamics 06-24-2020, 05:36 PM
Replies: 84
Views: 9,412
Posted By Engeu1
I've read that the convergence angle can't go...

I've read that the convergence angle can't go much beyond 16 degrees without breakaway, hence the v.g. idea.
Forum: Aerodynamics 06-24-2020, 05:31 PM
Replies: 84
Views: 9,412
Posted By Engeu1
So this: ...

So this:

https://i2.wp.com/ezlogzblog.com/wp-content/uploads/2018/05/24597.jpg?w=500&ssl=1
...
Forum: Aerodynamics 06-24-2020, 05:08 PM
Replies: 84
Views: 9,412
Posted By Engeu1
There is a proper integrated deflector at the...

There is a proper integrated deflector at the front over the cab, but a side gap which will get looked at later on. It's the same basic body as the Volkswagen Crafter (if you know that).
Forum: Aerodynamics 06-24-2020, 04:58 PM
Replies: 84
Views: 9,412
Posted By Engeu1
I have radii on the sides at the top, but all...

I have radii on the sides at the top, but all rear edges are square.



If fairly or unfairly we put the following in the category of vanes, how would you put the respective fuel economy or drag...
Forum: Aerodynamics 06-24-2020, 02:26 PM
Replies: 84
Views: 9,412
Posted By Engeu1
Was that in his 1987 book? Your Ragatz and...

Was that in his 1987 book?

Your Ragatz and Thornton post is also interesting helpful.
Forum: Aerodynamics 06-22-2020, 09:20 AM
Replies: 84
Views: 9,412
Posted By Engeu1
There's also another great report by Maragno &...

There's also another great report by Maragno & Visser, May 2003 with a lot of plots.

Comments then please on a vane system, 3 or 4 sides of box, say 6 in / 15 cm radius, no inset, v.g.s?

90...
Forum: Aerodynamics 06-20-2020, 11:53 PM
Replies: 84
Views: 9,412
Posted By Engeu1
@jakobnev, no, there's no lift so three of the...

@jakobnev, no, there's no lift so three of the four sides are 'clean'.

@freebeard, j-c-c, on passive porosity, maybe that's something like the porous 'silencers' on some pneumatic systems which...
Forum: Aerodynamics 06-20-2020, 02:59 PM
Replies: 84
Views: 9,412
Posted By Engeu1
There may have been more to it and I'm wondering...

There may have been more to it and I'm wondering now if it was maybe pneumatic. I'll keep looking for now.
Forum: Aerodynamics 06-20-2020, 11:10 AM
Replies: 84
Views: 9,412
Posted By Engeu1
@JSH, yes that's the sort. Side skirt is in the...

@JSH, yes that's the sort. Side skirt is in the pipeline, but priority has to be rear now because of a forthcoming non-aero change. Anyway, looks like U-Haul didn't fit a deflector on the overcab...
Forum: Aerodynamics 06-19-2020, 04:08 PM
Replies: 84
Views: 9,412
Posted By Engeu1
I think the CD is around .37 for my vehicle,...

I think the CD is around .37 for my vehicle, versus .32 for the Sprinter panel van.

Ask uncle google for images of 'sprinter luton van' and you'll get the idea.
Forum: Aerodynamics 06-18-2020, 02:34 PM
Replies: 84
Views: 9,412
Posted By Engeu1
Box van rear end mod

Hello All,

I have a non-articulated box truck with front wind deflector.

The rear of the box ends with a typical 90 degree angle with cross section of about 5 metres / 54 sq ft, so huge...
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