Why twin tails?
Is there a simple technical explanation for the idea of 2 vertical stabilisers (or even 3) at the ends of the tailplane instead of one bigger central element? I would think it adds load to the tailplane structure but I don't see any advantage. Seemed more common on the heavy piston aircraft of WWII era and I can't think of a modern design with this feature.
I understand why such things are sometimes added to increase stability - Shuttle 747 comes to mind.
Thanks