Hey, Gordon
I started with 1 1/2" at the middle, extending for 10" on each side of center, and then a continuous taper to 1/2" tips. I tried to keep the thickness to the 7/8 rule of the BLBS, where the bow ends up not quite as thick as it is wide. D section profile, of course! This is the only way to go with yew. However, having said that, I'm thinking of making a yew flat bow, with wider limbs, a built up riser, and more elliptical tiller. I have a naturally reflexed stave, and I want to try something other than a traditional ELB. I'm by no means an expert with yew. Someone like Marc St Louis would be a good person to ask. Good luck. I really enjoyed making the yew bow, it's amazing wood.