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"The Japanese presence in Vietnam also attracted foreign attention, particularly that of the United States. In 1940 America was not yet at war with Japan, but it was nevertheless seeking to restrict Japanese expansion. The US also wanted to protect its imports of raw rubber, half of which came from Vietnam. Washington had backed the French colonial regime in Vietnam, hoping it would resist Japanese overtures. But when the French caved in to Japanese demands, the US changed tack. - See more at: Japanese occupation of Vietnam
Yea your right the ME262 was 100% fully devolved 3 years before D-Day, the reason their where so few is because Hitler did not think that they where good.
The German jet engines were extremely unreliable and had low performances with very high fuel consumption. The German axial turbojets never worked properly and were developed up to 1953 by the French to get a usable engine. They lost a lot of time playing around with the German engines, instead of working with the British. The French and Soviets after WW2 tried to improve the German engines and largely failed.
In 1945 the team from the ATAR laboratory plus some BMW and Junkers engineers, were engaged by the French SNECMA research bureau, with the objective to built a new reliable and performing axial flow turbojet. The BMW 003/Jumo004 was considered unusable. It was tested on the first French jet aircraft, the 1946 So6000 Triton, but overheated and exploded. The plane only flew with a RR Nene turbojet.
The ATAR project took 6 years to produce the first acceptable axial turbojet (ATAR 101 B1), but was only produce in 1953. So 8 years research and developments by the French using the German jet engines as the base. It was installed on the first French jet fighter, the Dassault Ouragan.
In 1945 some German designed turbo jets made with quality steel were made and tested by the French. They ran for 25 hours instead 10 hours to the poor steel the Germans used. Not much better. The German axial design failed because of heavy design faults. The centrifugal compressor used by the first British Meteor was fine and much more reliable, but unable to reach high compression ratios. This limited performances. Centrifugal compressors were use up to the 1960s.
Centrifugal compressors were used in turboprops. Between a turbo jet and a turboprop, the only difference is the turbine, not the compressor. The last centrifugal compressor jet engine still in service on a handful of old commercial aircraft like the Fokker 27, is the RR Dart turboprop. A very reliable engine made in 27 versions, but with high fuel consumption. The turbo jet engine that was the longest produced, was the Rolls Royce Dart Turboprop - a comparable design as a turbojet like the RR Nene. This rugged engine was and produced from 1946 up to 1987.
The French lost a lot of time because the German jets had a poor efficiency and some concept fails. Essentially in the combustion chambers and fresh air circulation to reduce the external temperature of the engine. The BMW jet was know for overheat problems which precluded fuselage installation.
The question at the end of WW2 was what is the most efficient way to produce jet fighters. The answer is clearly no to adopting the German design of engine and fuselage. The build costs for a jet engine were much higher than a piston engine, and the consumption was near 3x. The centrifugal compressor the British adopted in some planes was the best choice with 1944-45 technology, more compression pressure was not an advantage when the hot turbine was unable to resist higher temperatures. And the German turbojets had big overheat problems as the engine would not work in an enclosed fuselage for single engined fighters. This defect was immediately noted by the French on the 1946 "SO 6000 Triton" prototype, and from the Soviets on the 1946 Mig 9. The Soviets quickly replaced the BMW 004B2 by the RR Nene which worked without problems. The RR Nene was copied to the last nut by the USSR and put in the Mig 15 and used effectively in the Korean war. About 10 years ago the USSR eventually paid royalties to RR.
Japan wanted to knock out the US since they were the only power that could derail their plans to bring to culmination The East Asia Co-Prosperity. By sidelining the US, Japan could concentrate their military resources to meet that goal.
Japan by and large succeeded however the main targets of the raid on Pearl Harbour were at sea: the carriers.
Britain still had a viable Navy and were mainly concerned with protecting the shipping that was the life blood of the UK. At the time of the attack, Britain had been at war for 2 years. So the effort was made to bolster the Brits while the USN in the Pacific rebuilt and commenced a delaying action until the warships were available to push back the Japanese. US submarines started attacking Japanese shipping and after a fitful start were able to starve Japan.
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