On another thread davparlr remarkd: SR6 followed that up with the following: Firstly, the Germans first flying jet engines used centrifugal compressors. And they used radial inflow turbines. These were the Heinkel-Hirth HeS 3. This was replaced by the HeS 6, which worked but was deemed to be too heavy and was cancelled. The next development was the HeS 8 (109-001), which was delayed by problems and didn't produce the expected thrust. It was cancelled in favour of axial flow projects that Heinkel had also been working on. So, there was some effort in Germany towards making a centrifugal flow jet engine. These did not have the performance of the contemporary BMW and Jumo engines. Not sure that they were any more reliable, either. Partly on the RLM's instructions, Heinkel's class II jet engine featured a "diagonal" compressor - a cross between an axial and centrifugal compressor, which did not work as well as either. I have serious doubts as to whether Germany could have produced a 4000-5000lb static thrust jet using a centrifugal compressor, certainly before the Me 262 became operational. Back to the British. The RAE and AA Griffiths had been running test axial flow compressors since the mid 1930s. This was work towards their first complete engine, a turbo-prop, which was to be made by Metropolitan Vickers. When Whittle demonstrated his jet, the decision at MV was to drop the turbo-prop in favour of a new jet. The was the F.2. The F.2 did have reliability problems - these appear to be mainly in the combustion chamber, which caused hot spots in the turbine and turbine failure. The solution was to use several smaller combustion chambers like those used in the centrifugal types. This change was made in 1943, resulting in even more thrust. The F.2 gave more thrust than the contemporary Welland or (early mk) Derwent, was somewhat heavier but also more fuel efficient. One wonders if the reliability issues that the F.2 was experiencing would have been overlooked if Britain had been in a similar position to Germany in 1943/44? Another British axial flow egine was the Armstrong-Siddeley ASX. This didn't run until sometime in 1945, and was abandoned in favour of the Metrovicks F.9 Sapphire. In the US the only axial jet project I am aware of is the Lockheed L-1000 project.