PERFORMANCE characteristics of the German BMW-003 and Jumo 004 engines as a whole, as well as of their principal parts, are presented here.This paper, the authors point out, is not the result of experimental determinations in this country, but is rather a résumé of data obtained from German sources.The discussion is divided as follows: 1. Performance of complete machine. 2. Compressor performance. 3. Combustion-chamber performance. 4. Turbine performance. 5. Miscellaneous operating characteristics.