Have seen the saying "If you ain't breaking, you ain't making".  Well I am now officially making.  After making 12 bows from staves - all that shoot (some not so good 

) and none that broke, I decided to try a board bow.  Picked out the best 1X4 8 foot hickory I could find at Menards and started in.
At 23 inches she blew....fortunately on the tillering tree!
I think I stressed it too much when first trying to brace.  Things looked good at 3" of brace.  I tried to increase the brace a bit and over stressed it and heard a crack - one limb raised a splinter and the limb separated along the edge.  Being stubborn, I glued her up good and backed with some jute.  Obviously it didn't work.  Well it did until 23"  

Going back to a mulberry stave I have been working on.