I will agree that some white oaks are very tough,,in my 20 years as a timber cutter,,I have seen small white oaks hold up a tree ten times its size,,chestnut oak on the other hand is much weaker,,it splits very easy,which means the longitutal grain is very important,give this wood any chance and it will split,,the reason most oak bows follow the string is as the wood flexes it crushes the cells and they graduly break down,,a good piece of white oak with healthy wood and thin early wood will make a fine bow,,but if given a choice I will walk by an oak tree to get to a hickory