I'd listen to Pat and George, That viking bow I just made was not from a stave but the limb dimensions are as follows:
1.96" wide, .563" deep and the working length is 16.5" @ limb. I did not make it those dimensions those are the average measurements using a set of calipers AFTER the thing was made. The bow was northern white oak with about 1/16" growth rings. The caliper was just so I could give you correct average dimensions.
It probably wont be the same for your stave bow but it might give you some rough idea..... hope it helps some
half eye