I got a question in a PM about spine with these arrows. The answer is simple, we don't worry about spine with natural bamboo because it has a full length taper and it seems to work reall well with all kinds of bows. I treat the hex shafts the same way and give them a 22 inch taper. The rest of the shaft I leave alone so I can control the weight.
For those that want to know why I went through the trouble of making these is simple also.....SPINE! A few years ago some guys tried to make shafts by turning bamboo flooring. They worked about as good as a wet noodle. By glueing the bamboo into a hex shape, the power fibers are aranged around the whole diameter of the shaft and it stifens them up.
In the next couple of days I will be testing them and I will let everyone know how well they perform. Glad you guys like them.