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Just noticed this. Development of the BMW 018 appears to have begun in 1938 as the P 3303. It was only, finally, given the 018 designation in June 1942. It was basically in development for the entire course of the war. Circa August 1944, it measured 5000mm long (it had been 4750mm in June 1942) with a maximum diameter of 1250mm (which remained the same from June 1942 to May 1945). Evidently it had been shrunk back to a length of 4200mm by May '45. Projected thrust was 3400kg.

The P 3306 was 3200mm long with a maximum diameter of 850mm and a projected thrust of 1700kg.

Apparently SNECMA's Atar 101C was only 3680mm long with a maximum diameter of 890mm and 2800kg thrust. I mean, I guess it could've been a miniaturised 018 development but it does seem more likely that it was actually a slightly enlarged and improved development of the P 3306.


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