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.

Please learn the Insert Link button. It's not that hard.

please
 

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.:p

https://ecomodder.com/forum/images/e...createlink.gif https://ecomodder.com/forum/images/e...nsertimage.gif
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.

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.

guts
 

* 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.