Does anyone happen to know the capabilities of the A9/A10 America Rocket. I think I saw it was something like 10,000 pounds or something.
Besides if the Nazis did create nuclear weapons. They wouldn't be making them smaller to fit on ICBMs they'd be making the ICBMs bigger to fly their growing weapons. You'll probably have a Tsar Bomb by 1950.
Or something! The A9/A10 had a planned payload of 1000kg, including pilot. The Tsar Bomba weighed 27t and was 8M long and 2.1M wide--the A9 upper stage would have been 1.6M in diameter and the Russians didn't make one until 1961.
Although the A9/A10 had a planned range of 5000km there was no suitable guidance system in the 1940s, although radio guidance was planned it would have required transmitters near the target site.
Von Braun also had a design for a space station, a space shuttle, a Mars rocket and an orbital mirror array to zap ground targets in his sketchbook. He didn't build any of those either.