everything wrote:I don’t understand the arrow part. It has some curve on purpose?
The pass is where the arrow makes contact with the bow while it's drawn - essentially, the launch-point. I was referring to the curve of the bow between the tips/nocks.
The arrow itself is a departure from the basic ideas I was describing, but an arrow does all kinds of flexing both lateral and torsional while it's in flight, and that oscillation is most pronounced immediately after clearing the pass. It's a good point, though, because an arrow has to have an appropriate stiffness (spine) to compliment the draw weight, draw length, and follow-through which make up the sweet-spot inherent in each individual bow.
And more random thoughts befitting the theme of yours;
The unhewn log already knows how to cast an arrow.
Some logs need to be coaxed with nothing more than the removal of extraneous material. Others need to be 'educated' once their foundation is developed.
Each bow stave or log will contain its own, individual character (an actual bowyer's term), and that's where all the curves between the nocks occur. Some logs are exceptional and yield bows with unusual shooting characteristics beyond what one expect - much like Tiger.
A skilled bowyer can coax a functional bow out of just about any unhewn log for at least that one shot that really counts. We're still talking about IMA here, right?