I agree with you Joachim and with you half eye.
There are many advantages to quarter sawn grain orientation....another one is that it averages out differences in yearly growth rings, in each limb....you wil have maybe 20 growth rings or more, travelleing accross the limbs perpendiculary instead of 3 or 4 , if the rings run parrallel with the back face.....( on the chasing the rings method)...this means that if you aim for symetry when making the bow, they tend to bend more equaly, when you first bend the bow. avoiding stressing one limb more than another.
Also, when you use the natural back for the bow, you are only using the trees newest wood, which is the weakest....the most flexible maybe , but it has very ittle compressive strength....and the main power of a bow is its compressive strength ,,,the inner wood has naturaly hardened with age...and should be used if possible...
Dave
feel free to hijack any of my threads, let them go where they will..