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The J85-GE-21 is a lightweight, single-spool turbojet engine with a rated non-afterburning thrust of 3500 lbf (15.5 kilonewtons).

General Characteristics

  • Type: Afterburning turbojet engine
  • Diameter: 20.8 in (53 cm) inlet
  • Length: 112.5 in (286 cm)
  • Dry weight: 684 lb (310 kg)


  • Compressor: Single-spool 9 axial stages
  • Turbine: 2 stages
  • Combustors: Annular
  • Fuel type: Aviation turbine fuel


  • Maximum thrust: 3,600 lbf (16 kN) dry thrust and 5,000 lbf (22 kN) afterburner thrust
  • Air mass flow: 24 kg (53 lb) per second
  • Overall pressure ratio: 8.3 / 8.1 (J85-21 A~C model)
  • Turbine inlet temperature: 1,790 °F (980 °C)
  • Thrust-to-weight ratio: 5.25 dry and 7.3 afterburner
  • Specific fuel consumption: 1.24 lb/(lbf⋅h) or 35 g/(kN⋅s) dry thrust / 2.13 lb/(lbf⋅h) or 60 g/(kN⋅s) afterburner thrust

Keep Your Jet Engines in Operation

The GE J85-21 engine is susceptible to wear from friction, vibration, corrosion, high interior temperatures, and damage from the uptake of foreign debris. These inevitable hazards, paired with the physical stress of rapidly rotating engine parts, can lead to metal fatigue and the failure of the parts and accessories as time passes.

Allow our established operations and processes for engine maintenance repairs to protect your J85-21and its jet engine parts in the long run. Dial +1 (209) 983-1112 now to achieve the highest level of readiness and mission success with your turbojet engines.