12-30-2020, 04:37 PM
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#1 (permalink)
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Master EcoModder
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Kamm & other research models
Some of the 'missing' half-body wind tunnel research models may be viewed with:
SAE Paper 2020-01-0673, at the SAE International website.
The paper can be 'previewed', and images seen within the Abstract at no cost.
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12-30-2020, 05:11 PM
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#2 (permalink)
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Master EcoModder
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Please learn the Insert Link button. It's not that hard.
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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
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12-30-2020, 05:19 PM
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#3 (permalink)
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Master EcoModder
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please
Quote:
Originally Posted by freebeard
Please learn the Insert Link button. It's not that hard.
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I revisited the official instructions for posting images, and the information did not include enough instructions.
Scrolling down is magic.
Browsing, Pasting a URL is magic.
If I could get past that I might have a chance. 
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12-30-2020, 08:00 PM
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#4 (permalink)
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Master EcoModder
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The only difference is you click the first button. The resulting code is different
[U*L="x"]x[/URL] instead of [IMG]x[/IMG]
You could type it out by hand and it still works.
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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
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12-31-2020, 06:52 PM
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#5 (permalink)
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Quote:
Originally Posted by aerohead
Some of the 'missing' half-body wind tunnel research models may be viewed with:
SAE Paper 2020-01-0673, at the SAE International website.
The paper can be 'previewed', and images seen within the Abstract at no cost.
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A very significant paper for those developing vehicle shapes from scratch. It also puts the Kamm tail in a new light and shows very well how rear body drag is a complex mix of pressures caused as the airflow follows downwards-curved surfaces, pressures caused by edge vortices and base pressure.
A good example of how relying only on historic data and analysis can give quite poor understandings.
Thanks for bringing the paper to our attention.
Unfortunately, the preview section shows only a historic wrap-up - the guts of the paper are on pages 7 - 10.
Last edited by JulianEdgar; 12-31-2020 at 09:24 PM..
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01-06-2021, 12:50 PM
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#6 (permalink)
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Master EcoModder
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guts
Quote:
Originally Posted by JulianEdgar
A very significant paper for those developing vehicle shapes from scratch. It also puts the Kamm tail in a new light and shows very well how rear body drag is a complex mix of pressures caused as the airflow follows downwards-curved surfaces, pressures caused by edge vortices and base pressure.
A good example of how relying only on historic data and analysis can give quite poor understandings.
Thanks for bringing the paper to our attention.
Unfortunately, the preview section shows only a historic wrap-up - the guts of the paper are on pages 7 - 10.
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* Koenig-Fachsenfeld has all the original raw data.
* One takeaway for the global audience is that, the early investigators began with the entire half-body, then examined the ramifications of each truncation, quantitatively.
* The 2016 Cd 0.19, Mercedes-Benz IAA is a recent example in which the automaker 'adds back' some of the 'missing' length to obtain lower drag, while maintaining 'parkability' in a contemporary garage. A 1930's concept.
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