cmoore,
I think you have done a good job on that little bow. As usual, I did a analysis of your tillering job which is actually pretty good even though my picture does not look like it is. I have rotated your picture so that your tiller is vertical.
The reason for it looking wrong is that you have simply placed it on the tiller unevenly which makes the right limb bulge more than the left.
- cmoore's bow_2.jpg (225.52 KiB) Viewed 1788 times
That can be ascertained by measuring the length of the strings from each tip back to the tiller. The string line C-D is longer than the string ling C-E which means that it isn't centred. The green line above the bow's back shows that the right hand side of the riser area is higher than the left side. So, if you had positioned it a bit differently, it would have shown you tiller job to better effect.
Don't be surprised that your little bow did not blow. The stressors on a small bow are just as great as on a full sized adult bow from a mechanical perspective. I have long held a doubtful suspicion about the integrity of Yew being entirely dependent upon the integrity of the back surface and especially the sapwood.
In TBB Vol. 2 I think it was, Paul Comstock made a Yew bow for his teenaged daughter which had violated back rings and no sapwood at all and he reported that it shot fine. I have one here with me with seriously violayed sapwood growth rings which is quite sound and shoots fine.
