Key Specifications:
- Type: Turbojet with afterburner
- Length: 17 ft 10 in (5.44 m)
- Diameter: 3 ft 1 in (0.94 m)
- Weight: ~3,850 lb (1,746 kg)
- Compressor: 17-stage axial compressor
- Turbine: 3-stage axial turbine
Performance:
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Thrust:
- Dry (non-afterburning): ~11,870 lbf
- Afterburning: ~17,900 lbf
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Specific Fuel Consumption:
- Dry: ~0.76 lb/lbf/hr
- Afterburner: ~1.9 lb/lbf/hr
- Maximum RPM: 7,725 revolutions per minute
- Operational Altitude: Optimized for supersonic speeds at high altitude
Enthusiast Highlights:
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Distinctive Howl:
The J79 produces a characteristic high-pitched whistle or "howl" during operation, especially at idle or low power settings. This sound is often a favorite among aviation enthusiasts and can be heard from miles away. -
Afterburner Magic:
The J79's afterburner could produce flames extending up to 25 feet, creating an iconic visual spectacle during takeoffs or supersonic sprints. -
Supersonic Breakthrough:
The J79 was one of the first engines to provide sustained Mach 2 performance, cementing its role as a critical enabler for the F-4's legendary speed and climb rate. -
Innovative Design:
- The engine featured variable stator vanes in the compressor, a cutting-edge design for its time that allowed for greater efficiency across a wide speed range and helped mitigate compressor stalls.
- The single-spool design simplified maintenance and was highly reliable compared to its contemporaries.
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Combat Proven:
The J79 proved remarkably robust in harsh conditions, whether it was the high humidity of Southeast Asia during the Vietnam War or the cold, dry air over Europe. Its adaptability made it a favorite among crews. -
Legacy Beyond the F-4:
The J79 also powered other iconic aircraft, such as the Convair B-58 Hustler, Lockheed F-104 Starfighter, and even the experimental North American XB-70 Valkyrie.