One can get values for load bearing of simple wood constructions and thus the right beam profile dimensions to choose from tables from wood supplies (e.g. http://www.merkleholz.de/en/Static-table-KVH-8082-192.html). Does it matter for such simple constructions in which sense to orientate the beam, i.e. does a 60mm x 100mm beam on two 100mm x 100mm posts support the same in this
and in this
I read the wikipedia articles on beams and beam theorie and I guess it's in the equations, but I don't seem to figure it out.