Best rearmament of the Reichswehr?

Without a wartime climate Germany may have been able to collaborate on the 2000+ HP engines she could not easily produce on her own. Jet engines are likely still developed quietly and rocket research will proceed more slowly. Zuse still develops his computers albeit with more corporate funding than government money. Stalin may not see a need to adopt the T34 if Koshin isn't pressing as hard but they still but the Christie tank prototype.
 
like others would have had a practical path to nuclear powered ships mapped out 1945. Perhaps earlier.

You mean the steam engine?
but without refugee physicists.
Like Einstein and Fermi and Slizard.

This is a very small group of people and a small group of labs working on Nuclear power and propulsion. The likely beneficiery of no Hitler ( apart from the murdered Jews that is) is likely to be 1. France which has one of the leading research centre's in the world plus you get to live in Paris. 2 Cambridge, thats the nice one on the Cam where they know how to make tea and the posh totty has limited morals. And for both of those you can take the train home on weekends to visit your gran

3. Everywhere else, no WW2 no US defence budget paying your bills.

Without a wartime climate Germany may have been able to collaborate on the 2000+ HP engines she could not easily produce on her own. Jet engines are likely still developed quietly and rocket research will proceed more slowly. Zuse still develops his computers albeit with more corporate funding than government money. Stalin may not see a need to adopt the T34 if Koshin isn't pressing as hard but they still but the Christie tank prototype.
Unlikely there simply is not the money around or the need around to press on with lots of unprofitable research at speed. It only becomes profitable if there is an order coming for the next iteration of fighter aircraft.

Then the RAF introduces the Vampire followed by Canberra and Valiant and all your air forces of obsolete also air defences so what use is a 2000 hp piston engine when you got jets. Well obviously not if you are Soviet or American but there you go.

There is actually a French artillery rocket programme thats about level with the German in 1940 it only falls behind because the Germans did more experimentation during the early 40s, and used more slaves. When the Napoleon 1 and 2 missiles land on Berlin and the Ruhr those fancy fighters won't be much use.

Zuse is a maybe but outside the military he gets no funding. contrast this with Bell and British telecoms teams who are all funded because of extensive issues in telephone exchanges which is a commercial problem needing to be solved, also the NPL which is a quasi military research establishment geared to specific problems.
 
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