Originally Posted by BCRider

For a given torque in the hub radial spokes will see a much higher torque related rise in tension compared to tangential spokes due to the geometry of how the tension in the hub is applied to the spokes. Due to the radial nature the hub has a lot more mechanical advantage due to the angle the radial of the hub meets the spoke at. That mechanical advantage means the hub torque is going to be able to pry on the spokes with a better leverage ratio so the tension buildup in the spokes from the torque will be a lot higher than for the tangential setup.