The present book describes the development history of turbojet engines, mainly in the web-type triangle Great Britain (USA) - Germany - Switzerland from early beginnings in the 1920s up to the first practical usage in the 1950s, before the still unbroken, grand impact of aero propulsion technology on global air traffic started. interconnections are highlighted, including the considerable impact of axial-flow compressor design know-how of the Swiss/German company BBC Brown Boveri& Cie. on both sides.

The author reveals significant undercurrents which led to a considerable exchange, and thus change in understanding of the technical-historical perspective, especially in the decisive years before WWII, and thus closes gaps in the unilateral views of this ground-breaking technical advancement. The old Whittle vs. von Ohain Saga is not repeated in full, but addressed in sufficient detail to understand the considerably enlarged narrative scope.

Prof. Dr.-Ing. Dietrich ECKARDT has more than forty years of professional experience in turbomachinery research, in German turbojet engine and Swiss power generation gas turbine industry. He is winner of the 2017 ASME engineer-historian award.

SurveyRelevant timeline for aero engine technolgy - from ~ 400 B.C to 1951.- Excursion I: Max Koenig (1893-1975) and Claude Seippel (1900-1986)Detailed personal description of two Swiss engineers, an early 'turbojet prophet' and the important 'Father of the axial compressor'.- Turbomachinery and Aero-Related Activities at BBC and in International Context up to 1935Internationl description of early turbomachinery design experiences.- Excursion II: Fritz Heppner (1904-1982) and Hellmut Weinrich (1909-1988)Personal description of a German/ English Jewish engineer, and his German partner.- 'Connections' and Early Turbojet Developments 1935-1939A jet-web type survey of early beginnings in turbojet engine technology, and related basics.- Excursion III: Helmut Schelp (1912-1994) and Max Adolf Mueller (1901-1962)The 'good and the bad guy' in German turbojet engine development.- The War Years 1940-1945Comparative description of turbojet engine development in Great Britain/ USA and Germany, with Swiss support.- Excursion IV: Hermann Reuter (1911-1981) and Hermann Oestrich (1903-1973)Detailed personal description of two leading German turbojet engineers.- The Post-War PeriodTurbojet engine techology transfer amongst the Allies.