I never got close to a V-2 but I did work on the Redstone, which was developed from the V-2. The Redstone and I assume the V-2 as well was steered by carbon vanes (4) which projected into the rocket exhaust. These vanes depending on which were used could place the V-2 / Redstone on the proper target azimuth, the proper roll pattern and then control the ballistic trajectory. You also must understand that not only technology developed by the Germans was appropriated by the Americans (and Russians) they got the top engineering staff from both the missile and aircraft development programs so if the Germans had developed the technology it would most likely be applied by the Americans. So the question still remains who really did develop the controllable tail plane? After all the British got some of the technology as well.
