Heinkel He 178

Heinkel He 178 The Heinkel He 178 was the first aircraft to fly powered exclusively by a turbojet engine, demonstrating a breakthrough in aviation propulsion a few months before World War II. Conceived and built by Erich Heinkel's firm Heinkel Flugzeugwerke with engines by Hans von Ohain, the He 178's 1939 flight at Rostock showcased technologies that would influence Messerschmitt designs, Gloster developments, and postwar programs. The aircraft's brief program involved figures and institutions from Nazi Germany, but its technical lineage extended to postwar projects in the United Kingdom, United States, and Soviet Union.

Design and Development

Heinkel's design team, led by chief designer Ernst Heinkel associates and influenced by the theoretical work of Hans von Ohain and contemporaneous efforts by Frank Whittle, produced a compact airframe optimized for a single turbojet. The fuselage used a conventional wooden and metal mixed construction inherited from Heinkel prototypes such as the Heinkel He 70 and Heinkel He 112; aerodynamic features echoed research from Aerodynamische Versuchsanstalt (AVA) and wind tunnels at Kaiser Wilhelm Institute. The turbojet was developed by von Ohain and built by Heinkel-Heeres, with the installation conceptually related to experimental work at Reichsluftfahrtministerium facilities and drawing on compressor and turbine advances studied at Siemens and BMW research groups. Political patrons included industrialists aligned with Hermann Göring's Luftwaffe procurement staff and administrative support from Ernst Udet's procurement circles. The He 178's layout—single-seat, low-mounted wings, and mid-fuselage jet intake—was an evolution distinct from propeller-driven contemporaries like the Junkers Ju 87 and Focke-Wulf Fw 190, yet it shared production techniques with civil models supplied to carriers such as Deutsche Lufthansa.

Technical Specifications

The He 178 employed von Ohain's centrifugal-flow turbojet, featuring components and metallurgy influenced by firms such as Vereinigte Werke, Thyssen, and precision firms supplying RLM programs. Its powerplant produced modest thrust compared to later axial-flow units from Junkers and BMW, but it demonstrated continuous combustion and turbine extraction sufficient for sustained flight. Structural elements incorporated duralumin and high-strength steels from Krupp and Dornier subcontractors, while control surfaces used cables and pulleys refined by suppliers that worked on Heinkel He 111 components. The undercarriage retracted into fairings using mechanisms similar to those on Messerschmitt Bf 109 prototypes. Avionics were minimal, influenced by instrumentation standards from Aviation Inspection Directorate practices and flight testing protocols observed at Deutsche Versuchsanstalt für Luftfahrt (DVL).

Flight Testing and Operational History

The He 178 conducted its first publicized flight on 27 August 1939 with test pilot Ernst Heinkel associates and later demonstrations for Luftwaffe officials including representatives of Erhard Milch and testing overseen by engineers formerly attached to Luftfahrtforschungsanstalt. Test flights occurred at Rechlin and local airfields near Rostock, evaluated by personnel familiar with trials of Heinkel He 112 and other Heinkel types. Reports were reviewed by RLM technical boards alongside assessments of turbojet research at Hannover and comparative data from British trials at Heston Aerodrome and Gloster Aircraft Company. Despite proving jet propulsion, the project received limited immediate procurement because Luftwaffe priorities favored proven designs and programs like Messerschmitt Bf 110 and Heinkel He 111, while resources shifted to mass production for campaigns such as Poland 1939 and Western Campaign 1940.

Legacy and Influence

Although only a single prototype flew, the He 178's demonstration accelerated interest in jet engines within Germany and abroad, informing later operational aircraft such as the Messerschmitt Me 262 and influencing research at institutes like the DFVLR and postwar bodies including NASA centers. Engineers and scientists involved later migrated to programs in the United States under Operation Paperclip and to the Soviet Union via captured archives, affecting jet projects at Bell Aircraft, Rolls-Royce, Mikoyan-Gurevich, and Sukhoi. The He 178 is referenced in technical histories alongside milestones like the Gloster E.28/39 and engines by Frank Whittle that led to mass-produced jet fighters and airliners such as the de Havilland Comet and Boeing 707. Its accomplishments also informed metallurgy and turbine blade cooling advances pursued at General Electric and Pratt & Whitney.

Surviving Artefacts and Replicas

No original He 178 airframe survives; documentation and components were dispersed among archives captured and studied by Allied Technical Intelligence teams, including personnel from RAF, USAAF, and Soviet Air Force units. Reconstructions and replicas have been produced for museums referencing the He 178 story at institutions such as the Deutsches Museum, Imperial War Museum, Smithsonian Institution, and aviation collections in Berlin and Munich. Academic treatments and exhibits cite papers from researchers at Technische Universität Berlin, RWTH Aachen University, and historians affiliated with Bundesarchiv and the Royal Air Force Museum. Replicas draw on surviving drawings preserved in collections formerly held by Heinkel Werke engineers and in dossiers seized during operations by units under General Dwight D. Eisenhower and Marshal Georgy Zhukov.

Category:Experimental aircraft Category:Early jet aircraft Category:German aircraft 1930s