| | The Pratt Whitney J-58 Aircraft Engine | The Pratt Whitney J-58 was a single-spool hybrid turbojet engine with an afterburner which also functioned as a fan-assisted ramjet. The Pratt Whitney J-58 first ran in 1958 and was the first jet engine to be flight-qualified by the USAF for Mach 3. The J-58 featured variable-geometry inlets to ensure air flow into the compressor was always subsonic. The engine had to use JP-7 high flash point and therefore required triethylborane (TEB), which spontaneously combusts in air, to be injected into the engine to start it and also to ignite the afterburner. |
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The high temperature the J-58 could reach at full power required a silicone oil which had the viscosity of grease at ambient temperatures, the engine had to be pre-heated before starting in order to reduce the lubricants viscosity to that of conventional oil. Pratt Whitney J58-P4 Specifications: |
- Type: afterburning variable cycle hybrid turbojet/ramjet
- Length: 17 ft 10 in (5.44 m) (18 ft 4 in (5.59 m at maximum operating temperature)
- Diameter: 4 ft 9 in (1.45 m)
- Dry weight: approx. 6,000 lb (2,700 kg)
- Compressor: 9-stage, axial flow, single spool
- Combustors: 8 can, annular
- Turbine: two-stage axial flow
- Fuel type: JP-7 high flash point fuel
- Maximum thrust: 34,000 pounds-force (150 kN) (wet), 25,000 pounds-force (110 kN) (dry)
- Overall pressure ratio: 6
- Specific fuel consumption: 1.9 lb/(lbf-h) (wet), 0.9 lb/(lbf-h) (dry)
- Thrust-to-weight ratio: approx. 6
- Core air flow: 450 lb/s, (200 kg/s)
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Pratt & Whitney J-58 Jet Engine
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Pratt Whitney J-58 Aircraft Engine picture and Specifications |
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