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$2billion in nineteens forty money was spent but other than teaching the USSR how to make nuclear bombs had little effect on the war.the decision to separate u235 by diffusion and electromagnetic means instead of centrifuges meant that bombs were not available till Japan was defeated .
When has a military ever said, "hold on, let's not bother with that" ?
The cavity magnetron certainly made airborne radar a lot more compact, but the Nazis had a perfectly serviceable system too. The European theater was quite different from the Pacific, as I outlined in reply #3 above.
"what ifs" are utterly pointless in retrospect. What if the big bang never happened?
The cavity magnetron certainly made airborne radar a lot more compact,
The cavity magnetron was a radical improvement introduced by John Randall and Harry Boot at the University of Birmingham, England in 1940. Their first working example produced hundreds of watts at 10 cm wavelength, an unprecedented achievement. Within weeks, engineers at GEC had improved this to well over a kilowatt, and within months 25 kilowatts, over 100 kW by 1941 and pushing towards a megawatt by 1943. The high power pulses were generated from a device the size of a small book and transmitted from an antenna only centimeters long, reducing the size of practical radar systems by orders of magnitude. New radars appeared for night-fighters, anti-submarine aircraft and even the smallest escort ships, and from that point on the Allies of World War II held a lead in radar that their counterparts in Germany and Japan were never able to close. By the end of the war, practically every Allied radar was based on a magnetron.
It has been argued that the failure of the Nazi nuclear program was due to the insistence of someone in authority (I forget who) that graphite could not be used as a moderator, so any reactor experiments had to be carried out with heavy water. The only bulk source was the Rjukan hydroelectric plant, sabotaged by a remarkable group of patriots and adventurers.Now there's a "what if" for you!
I Always held negative views & emotions on Nuclear Arsenals...But i Realize now that maybe Nukes would be Our last bet against an Extraterrestrial Attack.