I've done quite a lot of carving in seasoned birch (70 spoons and 30 forks, a couple of dishes.)
The diffuse porous anatomy won't give the axe handle any useful elastic properties to resist shatter.
I use birch for the handles of both my elbow adze and D-adze where the shock of the strike force is minimal.
BTW, Balsa-wood is technically a hardwood, being a deciduous species.
I'm sure we all can understand how that anatomy is a fail for axe handles!
The diffuse porous anatomy won't give the axe handle any useful elastic properties to resist shatter.
I use birch for the handles of both my elbow adze and D-adze where the shock of the strike force is minimal.
BTW, Balsa-wood is technically a hardwood, being a deciduous species.
I'm sure we all can understand how that anatomy is a fail for axe handles!