|An RM8 on display at the Swedish Air Force Museum|
|Manufacturer||Volvo Flygmotor/Pratt & Whitney|
|Major applications||Saab 37 Viggen|
|Developed from||Pratt & Whitney JT8D|
The Volvo RM8 is a low-bypass afterburning turbofan jet engine developed for the Saab 37 Viggen fighter. In 1962, the Pratt & Whitney JT8D-1 engine was chosen to power the Viggen in absence of a suitable and available engine designed for military use. Basically a licensed-built version of the JT8D, heavily modified for supersonic speeds, with a Swedish-designed afterburner, the RM8 was produced by Svenska Flygmotor (later known as Volvo Aero).
Variants and applications
- RM8A - AJ 37 Viggen
Since the original engine was constructed for subsonic speeds, most part of the engine had to be redimensioned for the higher Mach-speeds in a military aircraft. Fans and turbine were altered, a new burn-chamber designed and a totally new fuel-control system for both engine and afterburner.
- RM8B - JA 37 Viggen
The flight envelope for the fighter-version demanded both more power and better compressor stall margins. This led to a new fan-stage (the so-called "0-stage") was introduced, making the engine longer. This led to a total redesign of the fans, the low-pressure compressor and the burn-chambers.
Data from Flight International.
- Type: Afterburning turbofan
- Length: 6.23 m (20.44 ft)
- Diameter: 1.03 m (40.55 in)
- Dry weight: 2,350 kg (5,180 lb)
- Compressor: Axial flow, 3-stage fan, 3-stage LP, 7-stage HP
- Combustors: 9 chambers in can-annular arrangement, four injectors per chamber
- Maximum thrust: 72.2 kN (16,200 lbf) dry, 125 kN (28,100 lbf) wet
- Overall pressure ratio: 16.5:1
- Bypass ratio: 0.97:1
- Turbine inlet temperature: 1,120°C (RM8A)
- Specific fuel consumption: 65 kg/(kN h) (0.64 lb/(lbf h)) dry, 257 kg/(kN h) (2,52 lb/(lbf h)) wet
- Thrust-to-weight ratio: 5.4:1
- Related development
- Related lists
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