Jumo 004B engine did not achieve 100 hour reliability until early 1945. The switch to hollow turbine blades caused vibration problems which required time to sort out.
Jumo 004A was an earlier variant of the same engine which Germany chose not to place into mass production. 80 prototypes were built to allow Me-262 airframe testing and to gain experience with jet engines in general.
The 004A had vibration problems. The alloy compressor blades were switched out for steel units and bench tested with a 10 hour endurance with positive results. This was in December 1941. 3 months later it was carried up by a Bf110 for testing.
In 1943, the 004B was tested several times with 100 hour runs. Some of the 004B units developed vibration problems but was solved by changing the compressor blade's taper. The 004B weighed over 200 pounds less because of a change in the materials and this also led to a shorter service life (10-25 hours) on average.
(Not sure where you're getting your info...I use Pavelec and Meher-Homji for reference.)
Jumo 004A engine could have been mass produced during 1943.
Are you suggesting it was possible to mass produce a reliable jet engine before 1943?
The answer is yes. Like I posted earlier in the thread, *if* the RLM had taken Von Ohain and Heinkel seriously in the late 30's and sponsored the R&D nessecary, they could have had key issues worked out before the war began in earnest and production became a crisis resulting in mad scramble for materials, hiding production facilities and so on.
The timeline:
Dr. Wagner started his design of the axial turbine in 1935.
Von Ohain successfully tested his He S3a in 1937.
The He178 successfully flew, powered by a He S3B on 27 August 1939.
Jumo004A first tested October 1940
The He280 was demonstrated to Udet on 5 April 1941, who showed no interest.
The Me262 first flew under jet power 18 July 1942 (with a tail wheel).
Jumo 004A ordered into production by RLM August 1942.
The Ar234 first flew 15 June 1943.
Jumo 004B production begins January 1944.
BMW003 ready for mass production August 1944.
He162 successfully flew 6 December 1944.
January 1945 everyone's in a blind panic and coming up with space ships, flying lawn darts and God only knows what...far too late for any coherent jet engine development by this stage...
So in view of the early development of the jet engines, had the RLM taken an interest in this technology, and funded research during the prewar years, alot of progress could have been made when desperation was not a priority.