Volvo RM12

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Gripen 5.jpg
Type Turbofan
National origin Sweden/United States
Manufacturer Volvo Aero/GKN Aerospace
General Electric
First run 1978
Major applications Saab JAS 39 Gripen
Developed from General Electric F404

The Volvo RM12 is a low-bypass afterburning turbofan jet engine developed for the Saab JAS 39 Gripen fighter. A version of the General Electric F404, the RM12 was produced by Volvo Aero (now GKN Aerospace Engine Systems).

Design and development[edit]

Produced by Volvo Aero (now GKN Aerospace Engine Systems), the RM12 is a derivative of the General Electric F404-400. Changes from the standard F404 includes greater reliability for single-engine operations (including more stringent birdstrike protection), increased thrust, and the adoption of a full authority digital engine control (FADEC) system.[1][2] Several subsystems and components were also redesigned to reduce maintenance demands.[3] The air intakes of the engine were designed to minimize radar reflection from the compression fan, reducing the radar cross section of the aircraft overall.[2] The F404's analogue Engine Control Unit was replaced with the Digital Engine Control – jointly developed by Volvo and GE – which communicates with the cockpit through the digital data buses and, as redundancy, mechanical calculators controlled by a single wire will regulate the fuel-flow into the engine. These mechanical backup systems remain in the new Full Authority Digital Engine Control (FADEC) which Volvo began developing in 1996.[2] General Electric produces 50% of the engine. Elements such as the fan/compressor discs and case, compressor spool, hubs, seals, and afterburner are manufactured in Sweden, final assembly also taking place there.[2]


Specifications (Volvo RM12)[edit]

A technician visually inspecting a Gripen's RM-12 engine in-situ

General characteristics

  • Type: Afterburning turbofan
  • Length: 4.04 m (159 in)
  • Diameter: 0.889 m (35 in)
  • Dry weight:



See also[edit]

Related development

Comparable engines

Related lists


  1. ^ "Resonance problem hits Gripen Engine", Flight International, London, UK: Reed Business Information, 145 (4406): 15, 2–8 February 1994, ISSN 0015-3710, archived from the original on 16 December 2013, retrieved 16 December 2013.
  2. ^ a b c d "Reaktionsmotor 12 - både vacker och stark" [Reaction Engine 12 – both beautiful and strong]. Tech World (in Swedish). SE: IDG. 8 January 2013.
  3. ^ Volvo Aero (31 January 2008), "Gripen surpasses 100,000 flight hours – Volvo Aero's engine safest in the world", Volvo Financial Services Magyarország, Hungary, archived from the original on 10 January 2014, retrieved 12 January 2014.

External links[edit]