Maybe I should write an essay with diagrams instead of trying to explain it in
words this way :)
And I have to think of a reason why in the translation from wheel descendance
to seat rise somehow 55° overrules all other angles...
Lots of stuff to think about still!
Yes, very challenging.
Dirk said, that the 55 deg is the optimum with the given geometry, with e.g. another trail it would be another angle too...
Keep in mind that all the math stuff is almost useless if it is not interpretable for the "brainless" folks. Also the result should help to solve real construction questions and not only hypothetic ones.
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