Junkers Jumo 004 — Engine Manuals Collection

A curated collection of 5 primary-source factory documents covering the Junkers Jumo 004 — the world’s first mass-produced operational turbojet engine — variants A and B. All documents are in German language.

Designed by Dr. Anselm Franz at Junkers Flugzeug- und Motorenwerke AG, the Jumo 004 powered the Messerschmitt Me 262 — the world’s first operational jet fighter — and the Arado Ar 234, the first operational jet bomber. Approximately 6,000 to 8,000 units were produced between 1942 and 1946, with post-war production continuing in Czechoslovakia and the Soviet Union.

Variant A — 1 Manual

• Jumo 004 A Technical Drawing
  Jumo 004 A-0 Turbojet Aero Engine Technical Drawing Sheet (German Language)

Variant B — 3 Manuals

• Jumo 004 Operating Instructions
  Jumo 004 B-1 Turbojet Aero Engine Operating Instructions — Bedienung (German Language)
• Jumo 004 B Illustrated Parts Catalog
  Jumo 109-004 B-1 Special Turbojet Aero Engine Spare Parts List — Ersatzteilliste Sondertriebwerk (German Language)
• Jumo 004 B Brochures & Training — 2 documents:
  – Jumo 004 B Turbojet Aero Engine Training Diagrams Booklet — Kleintafeln, Lehrmittel-Abteilung (German Language)
  – Jumo 004 Turbojet Aero Engine Multi-View Technical Drawing (German Language)

No-Variant Manuals — 1 Manual

• Jumo 004 Engine Subsystems
  Riedel RBA/S 10 Gasoline Starter Motor Technical Documentation — Technische Unterlagen (German Language)
  The Riedel was a 10 hp 2-stroke motorcycle engine built into the intake cone, used to spin up the turbine for starting — one of the most ingenious engineering solutions of WWII aviation.

Historical Background

The Jumo 004 was the world’s first mass-produced operational turbojet engine, entering combat service in 1944. Its key variants:

• Jumo 004A — Initial heavy test model using scarce nickel and chromium alloys
• Jumo 004B — Primary mass-production model with lighter alloys and air-cooled turbine blades
• Jumo 004C/D/E — Late-war and post-war experimental versions with afterburners and water-methanol injection

Post-war, captured engines and production lines were adopted by the Soviet Union (as the RD-10) and Czechoslovakia (as the Avia M-04), forming the foundation of early Eastern European jet programs.

Technical Specifications

• Type: Turbojet — axial-flow
• Compressor: 8-stage axial-flow
• Combustion: 6 straight-through annular combustion chambers
• Turbine: 1-stage axial-flow
• Compression Ratio: 3.1:1
• Thrust: ~1,980 lbs static thrust at 8,700 RPM
• Weight: 745–757 kg (1,640–1,669 lbs)
• Fuel: J2 synthetic fuel (coal-derived), diesel, or standard aviation gasoline

Notable Engineering Features

• First operational axial-flow compressor jet engine in mass production
• Variable area exhaust nozzle with bullet-shaped centre cone
• Hollow air-cooled turbine blades — pioneering solution to material shortages
• Riedel APU — a 10 hp 2-stroke motorcycle engine hidden in the intake cone to spin up the turbine for starting
• Operational lifespan of only 10–25 hours due to wartime material constraints

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