High alitude yew is the best because it grows slower. The slower it grows, the thinner the growth rings, and the stronger the wood.
What you want for a warbow is:
- a nice straight piece, 76-78" long
- a good contrast between sap and heartwood is always nice
- free of knots
- thin growth rings (30 rings per inch is a good starting point for a beginner)
You will want to scrape the back to one single growth ring, jus to be on the safe side. There is room for minor errors, and if you're uncertain about he bows back, it's best to back it with rawhide.
Maybe it's best to start with ash or elm. Or with yew backed with hickory. Other good combinations are:
-lemonwood (and other variants)-purpleheart-hickory
-ipe- hickory/bamboo
-osage-hickory
and many many others!
all the best,
Tom