And that's the reason why i would like to try elliptical cross sections of the back. There are some remarks (examples!) in the textbook of Hucho that these maybe at least not worse than the tipped tails. If done right, of course. Does anyone have links to more systematic research on such tails - the 2 dimensional case might be even more interesting for a velomobile than the (rotationally symmetric) 3D-case.
A truncated tail is not necessarily that bad - see for example the Quest velomobile.
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