Volvo RM12 Engine

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The Volvo RM12 is a low bypass turbofan jet engine developed for the Saab JAS 39 Gripen fighter aircraft. It is a derivative of the General Electric F404 and is produced by Volvo Aero (now GKN Aerospace Engine Systems).

Main specifications:

Type: Afterburning turbofan
Length: 4.04 m (159 in)
Diameter: 0.889 m (35 in)
Dry weight: -
Compressor: Axial compressor with 3 fans and 7 compressor stages
Combustion chambers: Annular
Turbine: 1 low pressure stage and 1 high pressure stage
Maximum thrust: 54 kN (12,100 lbf) military thrust; 80.5 kN (18,100 lbf) with afterburner
Total pressure ratio: 27.5:1
Bypass ratio: 0.31:1
Mass air flow: 68 kg/s
Specific fuel consumption: 23.9 mg/(N·s) (0.844 lb/(lbf-hr)) military thrust; 50.6 mg/(N·s) (1.79 lb/(lbf-hr)) full afterburner
Thrust to weight ratio: 7.8