To turn a plane with enough control and fast enough, you need lots of rudder area - so, that requires a big tail. But the height factor enforced a small tail.

To turn a plane with enough control and fast enough, you need lots of rudder area - so, that requires a big tail. But the height factor enforced a small tail. What to do? With a small tail, you don't have enough rudder area or sideways force to turn the plane fast enough. So if you multiply that small tail by three, you get to build up sufficient sideways force to compensate for that small tail.